Articles | Volume 14, issue 11
https://doi.org/10.5194/cp-14-1755-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-14-1755-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
| 
20 Nov 2018
Research article | Highlight paper |
| 20 Nov 2018
| 20 Nov 2018
Connecting the Greenland ice-core and U∕Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events
Climate and Environmental Physics, Physics Institute & Oeschger
Centre for Climate Change Research, University of Bern, Sidlerstrasse 5,
3012 Bern, Switzerland
Quaternary Sciences, Department of Geology, Lund University,
Sölvegatan 12, 22362 Lund, Sweden
Christopher Bronk Ramsey
Research Laboratory for Archaeology and the History of Art, University
of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, UK
Tobias Erhardt
Climate and Environmental Physics, Physics Institute & Oeschger
Centre for Climate Change Research, University of Bern, Sidlerstrasse 5,
3012 Bern, Switzerland
R. Lawrence Edwards
Insitute of Global Environmental Change, Xi'an Jiatong University,
Xi'an 710049, China
Hai Cheng
Insitute of Global Environmental Change, Xi'an Jiatong University,
Xi'an 710049, China
Department of Earth Sciences, University of Minnesota, Minneapolis,
Minnesota 55455, USA
Chris S. M. Turney
Palaeontology, Geobiology and Earth Archives Research Centre and ARC
Centre of Excellence in Australian Biodiversity and Heritage, School of
Biological, Earth and Environmental Sciences, University of New South Wales,
Sydney, NSW 2052, Australia
Alan Cooper
Australian Centre for Ancient DNA and ARC Centre of Excellence in
Australian Biodiversity and Heritage, School of Biological Sciences, The
University of Adelaide, Adelaide, SA 5005, Australia
Anders Svensson
Centre for Ice and Climate, Niels Bohr Institute, University of
Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
Sune O. Rasmussen
Centre for Ice and Climate, Niels Bohr Institute, University of
Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
Hubertus Fischer
Climate and Environmental Physics, Physics Institute & Oeschger
Centre for Climate Change Research, University of Bern, Sidlerstrasse 5,
3012 Bern, Switzerland
Raimund Muscheler
Quaternary Sciences, Department of Geology, Lund University,
Sölvegatan 12, 22362 Lund, Sweden
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Minjie Zheng, Hongyu Liu, Florian Adolphi, Raimund Muscheler, Zhengyao Lu, Mousong Wu, and Nønne L. Prisle
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Chiara I. Paleari, Florian Mekhaldi, Tobias Erhardt, Minjie Zheng, Marcus Christl, Florian Adolphi, Maria Hörhold, and Raimund Muscheler
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Marie Bouchet, Amaëlle Landais, Antoine Grisart, Frédéric Parrenin, Frédéric Prié, Roxanne Jacob, Elise Fourré, Emilie Capron, Dominique Raynaud, Vladimir Ya Lipenkov, Marie-France Loutre, Thomas Extier, Anders Svensson, Etienne Legrain, Patricia Martinerie, Markus Leuenberger, Wei Jiang, Florian Ritterbusch, Zheng-Tian Lu, and Guo-Min Yang
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Emma Pearce, Dimitri Zigone, Coen Hofstede, Andreas Fichtner, Joachim Rimpot, Sune Olander Rasmussen, Johannes Freitag, and Olaf Eisen
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Paul Töchterle, Anna Baldo, Julian B. Murton, Frederik Schenk, R. Lawrence Edwards, Gabriella Koltai, and Gina E. Moseley
Clim. Past Discuss., https://doi.org/10.5194/cp-2023-72, https://doi.org/10.5194/cp-2023-72, 2023
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We present a reconstruction of permafrost and snow cover on the British Isles for the Younger Dryas period, a time of extremely cold winters that happened approximately 12.000 years ago. Our results indicate that seasonal sea ice in the North Atlantic was most likely a curcial factor to explain the observed climate shifts during this time.
Naoko Nagatsuka, Kumiko Goto-Azuma, Koji Fujita, Yuki Komuro, Motohiro Hirabayashi, Jun Ogata, Kaori Fukuda, Yoshimi Ogawa-Tsukagawa, Kyotaro Kitamura, Ayaka Yonekura, Fumio Nakazawa, Yukihiko Onuma, Naoyuki Kurita, Sune Olander Rasmussen, Giulia Sinnl, Trevor James Popp, and Dorthe Dahl-Jensen
EGUsphere, https://doi.org/10.5194/egusphere-2023-1666, https://doi.org/10.5194/egusphere-2023-1666, 2023
Preprint archived
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We present a new high-temporal-resolution record of mineral composition in a northeastern Greenland ice-core (EGRIP) over the past 100 years. The ice core dust composition and its variation differed significantly from a northwestern Greenland ice core, which is likely due to differences in the geological sources of the dust. Our results suggest that the EGRIP ice core dust was constantly supplied from Northern Eurasia, North America, and Asia with minor contribution from Greenland coast.
Anika Donner, Paul Töchterle, Christoph Spötl, Irka Hajdas, Xianglei Li, R. Lawrence Edwards, and Gina E. Moseley
Clim. Past, 19, 1607–1621, https://doi.org/10.5194/cp-19-1607-2023, https://doi.org/10.5194/cp-19-1607-2023, 2023
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This study investigates the first finding of fine-grained cryogenic cave minerals in Greenland, a type of speleothem that has been notably difficult to date. We present a successful approach for determining the age of these minerals using 230Th / U disequilibrium and 14C dating. We relate the formation of the cryogenic cave minerals to a well-documented extreme weather event in 1889 CE. Additionally, we provide a detailed report on the mineralogical and isotopic composition of these minerals.
Sune Olander Rasmussen, Dorthe Dahl-Jensen, Hubertus Fischer, Katrin Fuhrer, Steffen Bo Hansen, Margareta Hansson, Christine S. Hvidberg, Ulf Jonsell, Sepp Kipfstuhl, Urs Ruth, Jakob Schwander, Marie-Louise Siggaard-Andersen, Giulia Sinnl, Jørgen Peder Steffensen, Anders M. Svensson, and Bo M. Vinther
Earth Syst. Sci. Data, 15, 3351–3364, https://doi.org/10.5194/essd-15-3351-2023, https://doi.org/10.5194/essd-15-3351-2023, 2023
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Timescales are essential for interpreting palaeoclimate data. The data series presented here were used for annual-layer identification when constructing the timescales named the Greenland Ice-Core Chronology 2005 (GICC05) and the revised version GICC21. Hopefully, these high-resolution data sets will be useful also for other purposes.
Charlotte Honiat, Gabriella Koltai, Yuri Dublyansky, R. Lawrence Edwards, Haiwei Zhang, Hai Cheng, and Christoph Spötl
Clim. Past, 19, 1177–1199, https://doi.org/10.5194/cp-19-1177-2023, https://doi.org/10.5194/cp-19-1177-2023, 2023
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A look at the climate evolution during the last warm period may allow us to test ground for future climate conditions. We quantified the temperature evolution during the Last Interglacial using a tiny amount of water trapped in the crystals of precisely dated stalagmites in caves from the southeastern European Alps. Our record indicates temperatures up to 2 °C warmer than today and an unstable climate during the first half of the Last Interglacial.
Giulia Sinnl, Florian Adolphi, Marcus Christl, Kees C. Welten, Thomas Woodruff, Marc Caffee, Anders Svensson, Raimund Muscheler, and Sune Olander Rasmussen
Clim. Past, 19, 1153–1175, https://doi.org/10.5194/cp-19-1153-2023, https://doi.org/10.5194/cp-19-1153-2023, 2023
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The record of past climate is preserved by several archives from different regions, such as ice cores from Greenland or Antarctica or speleothems from caves such as the Hulu Cave in China. In this study, these archives are aligned by taking advantage of the globally synchronous production of cosmogenic radionuclides. This produces a new perspective on the global climate in the period between 20 000 and 25 000 years ago.
Michaela Mühl, Jochen Schmitt, Barbara Seth, James E. Lee, Jon S. Edwards, Edward J. Brook, Thomas Blunier, and Hubertus Fischer
Clim. Past, 19, 999–1025, https://doi.org/10.5194/cp-19-999-2023, https://doi.org/10.5194/cp-19-999-2023, 2023
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Our ice core measurements show that methane, ethane, and propane concentrations are significantly elevated above their past atmospheric background for Greenland ice samples containing mineral dust. The underlying co-production process happens during the classical discrete wet extraction of air from the ice sample and affects previous reconstructions of the inter-polar difference of methane as well as methane stable isotope records derived from dust-rich Greenland ice.
Nicolas Stoll, Julien Westhoff, Pascal Bohleber, Anders Svensson, Dorthe Dahl-Jensen, Carlo Barbante, and Ilka Weikusat
The Cryosphere, 17, 2021–2043, https://doi.org/10.5194/tc-17-2021-2023, https://doi.org/10.5194/tc-17-2021-2023, 2023
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Impurities in polar ice play a role regarding its climate signal and internal deformation. We bridge different scales using different methods to investigate ice from the Last Glacial Period derived from the EGRIP ice core in Greenland. We characterise different types of cloudy bands, i.e. frequently occurring milky layers in the ice, and analyse their chemistry with Raman spectroscopy and 2D imaging. We derive new insights into impurity localisation and deposition conditions.
Robert Mulvaney, Eric W. Wolff, Mackenzie M. Grieman, Helene H. Hoffmann, Jack D. Humby, Christoph Nehrbass-Ahles, Rachael H. Rhodes, Isobel F. Rowell, Frédéric Parrenin, Loïc Schmidely, Hubertus Fischer, Thomas F. Stocker, Marcus Christl, Raimund Muscheler, Amaelle Landais, and Frédéric Prié
Clim. Past, 19, 851–864, https://doi.org/10.5194/cp-19-851-2023, https://doi.org/10.5194/cp-19-851-2023, 2023
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We present an age scale for a new ice core drilled at Skytrain Ice Rise, an ice rise facing the Ronne Ice Shelf in Antarctica. Various measurements in the ice and air phases are used to match the ice core to other Antarctic cores that have already been dated, and a new age scale is constructed. The 651 m ice core includes ice that is confidently dated to 117 000–126 000 years ago, in the last interglacial. Older ice is found deeper down, but there are flow disturbances in the deeper ice.
Susanne Preunkert, Pascal Bohleber, Michel Legrand, Hubertus Fischer, Adrien Gilbert, Tobias Erhardt, Roland Purtschert, Lars Zipf, Astrid Waldner, and Joseph R. McConnell
The Cryosphere Discuss., https://doi.org/10.5194/tc-2022-259, https://doi.org/10.5194/tc-2022-259, 2023
Revised manuscript accepted for TC
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Being close to European pollution source regions makes ice cores from Alpine glaciers important to reconstruct past anthropogenic changes over Europe. Three ice cores covering the 20th century were extracted at the same place at the Col du Dôme (4250 masl, French Alps) in 1994, 2004, and 2012. Combining chemical profiles, bomb test markers and 210Pb profiles, used as footprints of crevasses, allowed to highlight changes over time of the depth-age characteristics at an Alpine drill site.
Lars Mächler, Daniel Baggenstos, Florian Krauss, Jochen Schmitt, Bernhard Bereiter, Remo Walther, Christoph Reinhard, Béla Tuzson, Lukas Emmenegger, and Hubertus Fischer
Atmos. Meas. Tech., 16, 355–372, https://doi.org/10.5194/amt-16-355-2023, https://doi.org/10.5194/amt-16-355-2023, 2023
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We present a new method to extract the gases from ice cores and measure their greenhouse gas composition. The ice is sublimated continuously with a near-infrared laser, releasing the gases, which are then analyzed on a laser absorption spectrometer. The main advantage over previous efforts is a low effective resolution of 1–2 cm. This capability is crucial for the analysis of highly thinned ice, as expected from ongoing drilling efforts to extend ice core history further back in time.
Zhiheng Du, Jiao Yang, Lei Wang, Ninglian Wang, Anders Svensson, Zhen Zhang, Xiangyu Ma, Yaping Liu, Shimeng Wang, Jianzhong Xu, and Cunde Xiao
Earth Syst. Sci. Data, 14, 5349–5365, https://doi.org/10.5194/essd-14-5349-2022, https://doi.org/10.5194/essd-14-5349-2022, 2022
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A dataset of the radiogenic strontium and neodymium isotopic compositions from the three poles (the third pole, the Arctic, and Antarctica) were integrated to obtain new findings. The dataset enables us to map the standardized locations in the three poles, while the use of sorting criteria related to the sample type permits us to trace the dust sources and sinks. The purpose of this dataset is to try to determine the variable transport pathways of dust at three poles.
Helle Astrid Kjær, Patrick Zens, Samuel Black, Kasper Holst Lund, Anders Svensson, and Paul Vallelonga
Clim. Past, 18, 2211–2230, https://doi.org/10.5194/cp-18-2211-2022, https://doi.org/10.5194/cp-18-2211-2022, 2022
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Six shallow cores from northern Greenland spanning a distance of 426 km were retrieved during a traversal in 2015. We identify several recent acid horizons associated with Icelandic eruptions and eruptions in the Barents Sea region and obtain a robust forest fire proxy associated primarily with Canadian forest fires. We also observe an increase in the large dust particle fluxes that we attribute to an activation of Greenland local sources in recent years (1998–2015).
Paul Töchterle, Simon D. Steidle, R. Lawrence Edwards, Yuri Dublyansky, Christoph Spötl, Xianglei Li, John Gunn, and Gina E. Moseley
Geochronology, 4, 617–627, https://doi.org/10.5194/gchron-4-617-2022, https://doi.org/10.5194/gchron-4-617-2022, 2022
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Cryogenic cave carbonates (CCCs) provide a marker for past permafrost conditions. Their formation age is determined by Th / U dating. However, samples can be contaminated with small amounts of Th at formation, which can cause inaccurate ages and require correction. We analysed multiple CCCs and found that varying degrees of contamination can cause an apparent spread of ages, when samples actually formed within distinguishable freezing events. A correction method using isochrons is presented.
Johannes Lohmann and Anders Svensson
Clim. Past, 18, 2021–2043, https://doi.org/10.5194/cp-18-2021-2022, https://doi.org/10.5194/cp-18-2021-2022, 2022
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Major volcanic eruptions are known to cause considerable short-term impacts on the global climate. Their influence on long-term climate variability and regime shifts is less well-understood. Here we show that very large, bipolar eruptions occurred more frequently than expected by chance just before abrupt climate change events in the last glacial period (Dansgaard–Oeschger events). Thus, such large eruptions may in some cases act as short-term triggers for abrupt regime shifts of the climate.
Eric W. Wolff, Hubertus Fischer, Tas van Ommen, and David A. Hodell
Clim. Past, 18, 1563–1577, https://doi.org/10.5194/cp-18-1563-2022, https://doi.org/10.5194/cp-18-1563-2022, 2022
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Projects are underway to drill ice cores in Antarctica reaching 1.5 Myr back in time. Dating such cores will be challenging. One method is to match records from the new core against datasets from existing marine sediment cores. Here we explore the options for doing this and assess how well the ice and marine records match over the existing 800 000-year time period. We are able to recommend a strategy for using marine data to place an age scale on the new ice cores.
Giulia Sinnl, Mai Winstrup, Tobias Erhardt, Eliza Cook, Camilla Marie Jensen, Anders Svensson, Bo Møllesøe Vinther, Raimund Muscheler, and Sune Olander Rasmussen
Clim. Past, 18, 1125–1150, https://doi.org/10.5194/cp-18-1125-2022, https://doi.org/10.5194/cp-18-1125-2022, 2022
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A new Greenland ice-core timescale, covering the last 3800 years, was produced using the machine learning algorithm StratiCounter. We synchronized the ice cores using volcanic eruptions and wildfires. We compared the new timescale to the tree-ring timescale, finding good alignment both between the common signatures of volcanic eruptions and of solar activity. Our Greenlandic timescales is safe to use for the Late Holocene, provided one uses our uncertainty estimate.
Philippa A. Higgins, Jonathan G. Palmer, Chris S. M. Turney, Martin S. Andersen, and Fiona Johnson
Clim. Past, 18, 1169–1188, https://doi.org/10.5194/cp-18-1169-2022, https://doi.org/10.5194/cp-18-1169-2022, 2022
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We studied eight New Zealand tree species and identified differences in their responses to large volcanic eruptions. The response is dependent on the species and how well it can tolerate stress, but substantial within-species differences are also observed depending on site factors, including altitude and exposure. This has important implications for tree-ring temperature reconstructions because site selection and compositing methods can change the magnitude of observed volcanic cooling.
Julien Westhoff, Giulia Sinnl, Anders Svensson, Johannes Freitag, Helle Astrid Kjær, Paul Vallelonga, Bo Vinther, Sepp Kipfstuhl, Dorthe Dahl-Jensen, and Ilka Weikusat
Clim. Past, 18, 1011–1034, https://doi.org/10.5194/cp-18-1011-2022, https://doi.org/10.5194/cp-18-1011-2022, 2022
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We present a melt event record from an ice core from central Greenland, which covers the past 10 000 years. Our record displays warm summer events, which can be used to enhance our understanding of the past climate. We compare our data to anomalies in tree ring width, which also represents summer temperatures, and find a good correlation. Furthermore, we investigate an outstandingly warm event in the year 986 AD or 991 AD, which has not been analyzed before.
Tobias Erhardt, Matthias Bigler, Urs Federer, Gideon Gfeller, Daiana Leuenberger, Olivia Stowasser, Regine Röthlisberger, Simon Schüpbach, Urs Ruth, Birthe Twarloh, Anna Wegner, Kumiko Goto-Azuma, Takayuki Kuramoto, Helle A. Kjær, Paul T. Vallelonga, Marie-Louise Siggaard-Andersen, Margareta E. Hansson, Ailsa K. Benton, Louise G. Fleet, Rob Mulvaney, Elizabeth R. Thomas, Nerilie Abram, Thomas F. Stocker, and Hubertus Fischer
Earth Syst. Sci. Data, 14, 1215–1231, https://doi.org/10.5194/essd-14-1215-2022, https://doi.org/10.5194/essd-14-1215-2022, 2022
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The datasets presented alongside this manuscript contain high-resolution concentration measurements of chemical impurities in deep ice cores, NGRIP and NEEM, from the Greenland ice sheet. The impurities originate from the deposition of aerosols to the surface of the ice sheet and are influenced by source, transport and deposition processes. Together, these records contain detailed, multi-parameter records of past climate variability over the last glacial period.
Jiamei Lin, Anders Svensson, Christine S. Hvidberg, Johannes Lohmann, Steffen Kristiansen, Dorthe Dahl-Jensen, Jørgen Peder Steffensen, Sune Olander Rasmussen, Eliza Cook, Helle Astrid Kjær, Bo M. Vinther, Hubertus Fischer, Thomas Stocker, Michael Sigl, Matthias Bigler, Mirko Severi, Rita Traversi, and Robert Mulvaney
Clim. Past, 18, 485–506, https://doi.org/10.5194/cp-18-485-2022, https://doi.org/10.5194/cp-18-485-2022, 2022
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We employ acidity records from Greenland and Antarctic ice cores to estimate the emission strength, frequency and climatic forcing for large volcanic eruptions from the last half of the last glacial period. A total of 25 volcanic eruptions are found to be larger than any eruption in the last 2500 years, and we identify more eruptions than obtained from geological evidence. Towards the end of the glacial period, there is a notable increase in volcanic activity observed for Greenland.
Nicolas Stoll, Maria Hörhold, Tobias Erhardt, Jan Eichler, Camilla Jensen, and Ilka Weikusat
The Cryosphere, 16, 667–688, https://doi.org/10.5194/tc-16-667-2022, https://doi.org/10.5194/tc-16-667-2022, 2022
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We mapped and analysed solid inclusion in the upper 1340 m of the EGRIP ice core with Raman spectroscopy and microstructure mapping, based on bulk dust content derived via continuous flow analysis. We observe a large variety in mineralogy throughout the core and samples. The main minerals are sulfates, especially gypsum, and terrestrial dust minerals, such as quartz, mica, and feldspar. A change in mineralogy occurs around 900 m depth indicating a climate-related imprint.
Nicolas Stoll, Jan Eichler, Maria Hörhold, Tobias Erhardt, Camilla Jensen, and Ilka Weikusat
The Cryosphere, 15, 5717–5737, https://doi.org/10.5194/tc-15-5717-2021, https://doi.org/10.5194/tc-15-5717-2021, 2021
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We did a systematic analysis of the location of inclusions in the EGRIP ice core, the first ice core from an ice stream. We combine this with crystal orientation and grain size data, enabling the first overview about the microstructure of this unique ice core. Micro-inclusions show a strong spatial variability and patterns (clusters or horizontal layers); roughly one-third is located at grain boundaries. More holistic approaches are needed to understand deformation processes in the ice better.
Johannes Sutter, Hubertus Fischer, and Olaf Eisen
The Cryosphere, 15, 3839–3860, https://doi.org/10.5194/tc-15-3839-2021, https://doi.org/10.5194/tc-15-3839-2021, 2021
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Projections of global sea-level changes in a warming world require ice-sheet models. We expand the calibration of these models by making use of the internal architecture of the Antarctic ice sheet, which is formed by its evolution over many millennia. We propose that using our novel approach to constrain ice sheet models, we will be able to both sharpen our understanding of past and future sea-level changes and identify weaknesses in the parameterisation of current continental-scale models.
Helle Astrid Kjær, Lisa Lolk Hauge, Marius Simonsen, Zurine Yoldi, Iben Koldtoft, Maria Hörhold, Johannes Freitag, Sepp Kipfstuhl, Anders Svensson, and Paul Vallelonga
The Cryosphere, 15, 3719–3730, https://doi.org/10.5194/tc-15-3719-2021, https://doi.org/10.5194/tc-15-3719-2021, 2021
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Ice core analyses are often done in home laboratories after costly transport of samples from the field. This limits the amount of sample that can be analysed.
Here, we present the first truly field-portable continuous flow analysis (CFA) system for the analysis of impurities in snow, firn and ice cores while still in the field: the lightweight in situ analysis (LISA) box.
LISA is demonstrated in Greenland to reconstruct accumulation, conductivity and peroxide in snow cores.
Tamara Annina Gerber, Christine Schøtt Hvidberg, Sune Olander Rasmussen, Steven Franke, Giulia Sinnl, Aslak Grinsted, Daniela Jansen, and Dorthe Dahl-Jensen
The Cryosphere, 15, 3655–3679, https://doi.org/10.5194/tc-15-3655-2021, https://doi.org/10.5194/tc-15-3655-2021, 2021
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We simulate the ice flow in the onset region of the Northeast Greenland Ice Stream to determine the source area and past accumulation rates of ice found in the EastGRIP ice core. This information is required to correct for bias in ice-core records introduced by the upstream flow effects. Our results reveal that the increasing accumulation rate with increasing upstream distance is predominantly responsible for the constant annual layer thicknesses observed in the upper 900 m of the ice core.
Loïc Schmidely, Christoph Nehrbass-Ahles, Jochen Schmitt, Juhyeong Han, Lucas Silva, Jinwha Shin, Fortunat Joos, Jérôme Chappellaz, Hubertus Fischer, and Thomas F. Stocker
Clim. Past, 17, 1627–1643, https://doi.org/10.5194/cp-17-1627-2021, https://doi.org/10.5194/cp-17-1627-2021, 2021
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Using ancient gas trapped in polar glaciers, we reconstructed the atmospheric concentrations of methane and nitrous oxide over the penultimate deglaciation to study their response to major climate changes. We show this deglaciation to be characterized by modes of methane and nitrous oxide variability that are also found during the last deglaciation and glacial cycle.
Kathleen A. Wendt, Xianglei Li, R. Lawrence Edwards, Hai Cheng, and Christoph Spötl
Clim. Past, 17, 1443–1454, https://doi.org/10.5194/cp-17-1443-2021, https://doi.org/10.5194/cp-17-1443-2021, 2021
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In this study, we tested the upper limits of U–Th dating precision by analyzing three stalagmites from the Austrian Alps that have high U concentrations. The composite record spans the penultimate interglacial (MIS 7) with an average 2σ age uncertainty of 400 years. This unprecedented age control allows us to constrain the timing of temperature shifts in the Alps during MIS 7 while offering new insight into millennial-scale changes in the North Atlantic leading up to Terminations III and IIIa.
Nathalie Van der Putten, Florian Adolphi, Anette Mellström, Jesper Sjolte, Cyriel Verbruggen, Jan-Berend Stuut, Tobias Erhardt, Yves Frenot, and Raimund Muscheler
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-69, https://doi.org/10.5194/cp-2021-69, 2021
Manuscript not accepted for further review
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In recent decades, Southern Hemisphere westerlies (SHW) moved equator-ward during periods of low solar activity leading to increased winds/precipitation at 46° S, Indian Ocean. We present a terrestrial SHW proxy-record and find stronger SHW influence at Crozet, shortly after 2.8 ka BP, synchronous with a climate shift in the Northern Hemisphere, attributed to a major decline in solar activity. The bipolar response to solar forcing is supported by a climate model forced by solar irradiance only.
Marcel Haeberli, Daniel Baggenstos, Jochen Schmitt, Markus Grimmer, Adrien Michel, Thomas Kellerhals, and Hubertus Fischer
Clim. Past, 17, 843–867, https://doi.org/10.5194/cp-17-843-2021, https://doi.org/10.5194/cp-17-843-2021, 2021
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Using the temperature-dependent solubility of noble gases in ocean water, we reconstruct global mean ocean temperature (MOT) over the last 700 kyr using noble gas ratios in air enclosed in polar ice cores. Our record shows that glacial MOT was about 3 °C cooler compared to the Holocene. Interglacials before 450 kyr ago were characterized by about 1.5 °C lower MOT than the Holocene. In addition, some interglacials show transient maxima in ocean temperature related to changes in ocean circulation.
Gabriella Koltai, Christoph Spötl, Alexander H. Jarosch, and Hai Cheng
Clim. Past, 17, 775–789, https://doi.org/10.5194/cp-17-775-2021, https://doi.org/10.5194/cp-17-775-2021, 2021
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This paper utilises a novel palaeoclimate archive from caves, cryogenic cave carbonates, which allow for precisely constraining permafrost thawing events in the past. Our study provides new insights into the climate of the Younger Dryas (12 800 to 11 700 years BP) in mid-Europe from the perspective of a high-elevation cave sensitive to permafrost development. We quantify seasonal temperature and precipitation changes by using a heat conduction model.
Chao-Jun Chen, Dao-Xian Yuan, Jun-Yun Li, Xian-Feng Wang, Hai Cheng, You-Feng Ning, R. Lawrence Edwards, Yao Wu, Si-Ya Xiao, Yu-Zhen Xu, Yang-Yang Huang, Hai-Ying Qiu, Jian Zhang, Ming-Qiang Liang, and Ting-Yong Li
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-20, https://doi.org/10.5194/cp-2021-20, 2021
Manuscript not accepted for further review
Xianglei Li, Kathleen A. Wendt, Yuri Dublyansky, Gina E. Moseley, Christoph Spötl, and R. Lawrence Edwards
Geochronology, 3, 49–58, https://doi.org/10.5194/gchron-3-49-2021, https://doi.org/10.5194/gchron-3-49-2021, 2021
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In this study, we built a statistical model to determine the initial δ234U in submerged calcite crusts that coat the walls of Devils Hole 2 (DH2) cave (Nevada, USA) and, using a 234U–238U dating method, extended the chronology of the calcite deposition beyond previous well-established 230Th ages and determined the oldest calcite deposited in this cave, a time marker for cave genesis. The novel method presented here may be used in future speleothem studies in similar hydrogeological settings.
Helle Astrid Kjær, Patrick Zens, Ross Edwards, Martin Olesen, Ruth Mottram, Gabriel Lewis, Christian Terkelsen Holme, Samuel Black, Kasper Holst Lund, Mikkel Schmidt, Dorthe Dahl-Jensen, Bo Vinther, Anders Svensson, Nanna Karlsson, Jason E. Box, Sepp Kipfstuhl, and Paul Vallelonga
The Cryosphere Discuss., https://doi.org/10.5194/tc-2020-337, https://doi.org/10.5194/tc-2020-337, 2021
Manuscript not accepted for further review
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We have reconstructed accumulation in 6 firn cores and 8 snow cores in Northern Greenland and compared with a regional Climate model over Greenland. We find the model underestimate precipitation especially in north-eastern part of the ice cap- an important finding if aiming to reconstruct surface mass balance.
Temperatures at 10 meters depth at 6 sites in Greenland were also determined and show a significant warming since the 1990's of 0.9 to 2.5 °C.
Michael Sarnthein, Kevin Küssner, Pieter M. Grootes, Blanca Ausin, Timothy Eglinton, Juan Muglia, Raimund Muscheler, and Gordon Schlolaut
Clim. Past, 16, 2547–2571, https://doi.org/10.5194/cp-16-2547-2020, https://doi.org/10.5194/cp-16-2547-2020, 2020
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The dating technique of 14C plateau tuning uses U/Th-based model ages, refinements of the Lake Suigetsu age scale, and the link of surface ocean carbon to the globally mixed atmosphere as basis of age correlation. Our synthesis employs data of 20 sediment cores from the global ocean and offers a coherent picture of global ocean circulation evolving over glacial-to-deglacial times on semi-millennial scales to be compared with climate records stored in marine sediments, ice cores, and speleothems.
Johannes Lohmann and Anders Svensson
Clim. Past Discuss., https://doi.org/10.5194/cp-2020-160, https://doi.org/10.5194/cp-2020-160, 2020
Manuscript not accepted for further review
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Major volcanic eruptions are known to cause considerable short-term impacts on the global climate. Their influence on long-term climate variability and regime shifts is less well understood. Here we show that very large, bipolar eruptions occurred more frequently than expected by chance just before abrupt climate change events in the last glacial period (the Dansgaard-Oeschger events). Thus, such large eruptions may in some cases act as short-term triggers to abrupt regime shifts of the climate.
Leonie Peti, Kathryn E. Fitzsimmons, Jenni L. Hopkins, Andreas Nilsson, Toshiyuki Fujioka, David Fink, Charles Mifsud, Marcus Christl, Raimund Muscheler, and Paul C. Augustinus
Geochronology, 2, 367–410, https://doi.org/10.5194/gchron-2-367-2020, https://doi.org/10.5194/gchron-2-367-2020, 2020
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Orakei Basin – a former maar lake in Auckland, New Zealand – provides an outstanding sediment record over the last ca. 130 000 years, but an age model is required to allow the reconstruction of climate change and volcanic eruptions contained in the sequence. To construct a relationship between depth in the sediment core and age of deposition, we combined tephrochronology, radiocarbon dating, luminescence dating, and the relative intensity of the paleomagnetic field in a Bayesian age–depth model.
Chris S. M. Turney, Richard T. Jones, Nicholas P. McKay, Erik van Sebille, Zoë A. Thomas, Claus-Dieter Hillenbrand, and Christopher J. Fogwill
Earth Syst. Sci. Data, 12, 3341–3356, https://doi.org/10.5194/essd-12-3341-2020, https://doi.org/10.5194/essd-12-3341-2020, 2020
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The Last Interglacial (129–116 ka) experienced global temperatures and sea levels higher than today. The direct contribution of warmer conditions to global sea level (thermosteric) are uncertain. We report a global network of sea surface temperatures. We find mean global annual temperature anomalies of 0.2 ± 0.1˚C and an early maximum peak of 0.9 ± 0.1˚C. Our reconstruction suggests warmer waters contributed on average 0.08 ± 0.1 m and a peak contribution of 0.39 ± 0.1 m to global sea level.
Bernhard Bereiter, Béla Tuzson, Philipp Scheidegger, André Kupferschmid, Herbert Looser, Lars Mächler, Daniel Baggenstos, Jochen Schmitt, Hubertus Fischer, and Lukas Emmenegger
Atmos. Meas. Tech., 13, 6391–6406, https://doi.org/10.5194/amt-13-6391-2020, https://doi.org/10.5194/amt-13-6391-2020, 2020
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The record of past greenhouse gas composition from ice cores is crucial for our understanding of global climate change. Deciphering this archive requires highly accurate and spatially resolved analysis of the very small amount of gas that is trapped in the ice. This is achieved with a mid-IR laser absorption spectrometer that provides simultaneous, high-precision measurements of CH4, N2O, CO2, and δ13C(CO2) and which will be coupled to a quantitative sublimation extraction method.
Seyedhamidreza Mojtabavi, Frank Wilhelms, Eliza Cook, Siwan M. Davies, Giulia Sinnl, Mathias Skov Jensen, Dorthe Dahl-Jensen, Anders Svensson, Bo M. Vinther, Sepp Kipfstuhl, Gwydion Jones, Nanna B. Karlsson, Sergio Henrique Faria, Vasileios Gkinis, Helle Astrid Kjær, Tobias Erhardt, Sarah M. P. Berben, Kerim H. Nisancioglu, Iben Koldtoft, and Sune Olander Rasmussen
Clim. Past, 16, 2359–2380, https://doi.org/10.5194/cp-16-2359-2020, https://doi.org/10.5194/cp-16-2359-2020, 2020
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We present a first chronology for the East Greenland Ice-core Project (EGRIP) over the Holocene and last glacial termination. After field measurements and processing of the ice-core data, the GICC05 timescale is transferred from the NGRIP core to the EGRIP core by means of matching volcanic events and common patterns (381 match points) in the ECM and DEP records. The new timescale is named GICC05-EGRIP-1 and extends back to around 15 kyr b2k.
Jinhwa Shin, Christoph Nehrbass-Ahles, Roberto Grilli, Jai Chowdhry Beeman, Frédéric Parrenin, Grégory Teste, Amaelle Landais, Loïc Schmidely, Lucas Silva, Jochen Schmitt, Bernhard Bereiter, Thomas F. Stocker, Hubertus Fischer, and Jérôme Chappellaz
Clim. Past, 16, 2203–2219, https://doi.org/10.5194/cp-16-2203-2020, https://doi.org/10.5194/cp-16-2203-2020, 2020
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We reconstruct atmospheric CO2 from the EPICA Dome C ice core during Marine Isotope Stage 6 (185–135 ka) to understand carbon mechanisms under the different boundary conditions of the climate system. The amplitude of CO2 is highly determined by the Northern Hemisphere stadial duration. Carbon dioxide maxima show different lags with respect to the corresponding abrupt CH4 jumps, the latter reflecting rapid warming in the Northern Hemisphere.
Jann Schrod, Dominik Kleinhenz, Maria Hörhold, Tobias Erhardt, Sarah Richter, Frank Wilhelms, Hubertus Fischer, Martin Ebert, Birthe Twarloh, Damiano Della Lunga, Camilla M. Jensen, Joachim Curtius, and Heinz G. Bingemer
Atmos. Chem. Phys., 20, 12459–12482, https://doi.org/10.5194/acp-20-12459-2020, https://doi.org/10.5194/acp-20-12459-2020, 2020
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Ice-nucleating particle (INP) concentrations of the last 6 centuries are presented from an ice core in Greenland. The data are accompanied by physical and chemical aerosol data. INPs are correlated to the dust signal from the ice core and seem to follow the annual input of mineral dust. We find no clear trend in the INP concentration. However, modern-day concentrations are higher and more variable than the concentrations of the past. This might have significant atmospheric implications.
Jesper Sjolte, Florian Adolphi, Bo M. Vinther, Raimund Muscheler, Christophe Sturm, Martin Werner, and Gerrit Lohmann
Clim. Past, 16, 1737–1758, https://doi.org/10.5194/cp-16-1737-2020, https://doi.org/10.5194/cp-16-1737-2020, 2020
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In this study we investigate seasonal climate reconstructions produced by matching climate model output to ice core and tree-ring data, and we evaluate the model–data reconstructions against meteorological observations. The reconstructions capture the main patterns of variability in sea level pressure and temperature in summer and winter. The performance of the reconstructions depends on seasonal climate variability itself, and definitions of seasons can be optimized to capture this variability.
Anders Svensson, Dorthe Dahl-Jensen, Jørgen Peder Steffensen, Thomas Blunier, Sune O. Rasmussen, Bo M. Vinther, Paul Vallelonga, Emilie Capron, Vasileios Gkinis, Eliza Cook, Helle Astrid Kjær, Raimund Muscheler, Sepp Kipfstuhl, Frank Wilhelms, Thomas F. Stocker, Hubertus Fischer, Florian Adolphi, Tobias Erhardt, Michael Sigl, Amaelle Landais, Frédéric Parrenin, Christo Buizert, Joseph R. McConnell, Mirko Severi, Robert Mulvaney, and Matthias Bigler
Clim. Past, 16, 1565–1580, https://doi.org/10.5194/cp-16-1565-2020, https://doi.org/10.5194/cp-16-1565-2020, 2020
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We identify signatures of large bipolar volcanic eruptions in Greenland and Antarctic ice cores during the last glacial period, which allows for a precise temporal alignment of the ice cores. Thereby the exact timing of unexplained, abrupt climatic changes occurring during the last glacial period can be determined in a global context. The study thus provides a step towards a full understanding of elements of the climate system that may also play an important role in the future.
Ashley Dinauer, Florian Adolphi, and Fortunat Joos
Clim. Past, 16, 1159–1185, https://doi.org/10.5194/cp-16-1159-2020, https://doi.org/10.5194/cp-16-1159-2020, 2020
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Despite intense focus on the ~ 190 ‰ drop in Δ14C across the deglacial
mystery interval, the specific mechanisms responsible for the apparent Δ14C excess in the glacial atmosphere have received considerably less attention. Sensitivity experiments with the computationally efficient Bern3D Earth system model suggest that our inability to reproduce the elevated Δ14C levels during the last glacial may reflect an underestimation of 14C production and/or a biased-high reconstruction of Δ14C.
Fortunat Joos, Renato Spahni, Benjamin D. Stocker, Sebastian Lienert, Jurek Müller, Hubertus Fischer, Jochen Schmitt, I. Colin Prentice, Bette Otto-Bliesner, and Zhengyu Liu
Biogeosciences, 17, 3511–3543, https://doi.org/10.5194/bg-17-3511-2020, https://doi.org/10.5194/bg-17-3511-2020, 2020
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Results of the first globally resolved simulations of terrestrial carbon and nitrogen (N) cycling and N2O emissions over the past 21 000 years are compared with reconstructed N2O emissions. Modelled and reconstructed emissions increased strongly during past abrupt warming events. This evidence appears consistent with a dynamic response of biological N fixation to increasing N demand by ecosystems, thereby reducing N limitation of plant productivity and supporting a land sink for atmospheric CO2.
Florian Mekhaldi, Markus Czymzik, Florian Adolphi, Jesper Sjolte, Svante Björck, Ala Aldahan, Achim Brauer, Celia Martin-Puertas, Göran Possnert, and Raimund Muscheler
Clim. Past, 16, 1145–1157, https://doi.org/10.5194/cp-16-1145-2020, https://doi.org/10.5194/cp-16-1145-2020, 2020
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Due to chronology uncertainties within paleoclimate archives, it is unclear how climate oscillations from different records relate to one another. By using radionuclides to synchronize Greenland ice cores and a German lake record over 11 000 years, we show that two oscillations observed in these records were not synchronous but terminated and began with the onset of a grand solar minimum. Both this and changes in ocean circulation could have played a role in the two climate oscillations.
Yue Hu, Xiaoming Sun, Hai Cheng, and Hong Yan
Clim. Past, 16, 597–610, https://doi.org/10.5194/cp-16-597-2020, https://doi.org/10.5194/cp-16-597-2020, 2020
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Tridacna, as the largest marine bivalves, can be used for high-resolution paleoclimate reconstruction in its carbonate skeleton. In this contribution, the modern δ18O shell is suggested to be a proxy for sea surface temperature in the Xisha Islands, South China Sea. Data from a fossil Tridacna (3673 ± 28 BP) indicate a warmer climate and intense ENSO-related variability but reduced ENSO frequency and more extreme El Niño winters compared to modern Tridacna.
Ole Valk, Michiel M. Rutgers van der Loeff, Walter Geibert, Sandra Gdaniec, S. Bradley Moran, Kate Lepore, Robert Lawrence Edwards, Yanbin Lu, Viena Puigcorbé, Nuria Casacuberta, Ronja Paffrath, William Smethie, and Matthieu Roy-Barman
Ocean Sci., 16, 221–234, https://doi.org/10.5194/os-16-221-2020, https://doi.org/10.5194/os-16-221-2020, 2020
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After 2007 230Th decreased significantly in the central Amundsen Basin. This decrease is accompanied by a circulation change, indicated by changes in salinity. Ventilation of waters is most likely not the reason for the observed depletion in 230Th as atmospherically derived tracers do not reveal an increase in ventilation rate. It is suggested that these interior waters have undergone enhanced scavenging of Th during transit from Fram Strait and the Barents Sea to the central Amundsen Basin.
Haiwei Zhang, Hai Cheng, Yanjun Cai, Christoph Spötl, Ashish Sinha, Gayatri Kathayat, and Hanying Li
Clim. Past, 16, 211–225, https://doi.org/10.5194/cp-16-211-2020, https://doi.org/10.5194/cp-16-211-2020, 2020
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Few studies have paid attention to the important effect of nonsummer monsoon (NSM) precipitation on the speleothem δ18O in SE China. We find the summer monsoon precipitation is equivalent to NSM precipitation amount in the area of spring persistent rain in SE China, and we discuss the relationships between seasonal precipitation amount, moisture source, δ18O, and ENSO. Characterizing the spatial differences in seasonal precipitation is key to interpreting the speleothem δ18O record.
Gina E. Moseley, Christoph Spötl, Susanne Brandstätter, Tobias Erhardt, Marc Luetscher, and R. Lawrence Edwards
Clim. Past, 16, 29–50, https://doi.org/10.5194/cp-16-29-2020, https://doi.org/10.5194/cp-16-29-2020, 2020
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Abrupt climate change during the last ice age can be used to provide important insights into the timescales on which the climate is capable of changing and the mechanisms that drive those changes. In this study, we construct climate records for the period 60 to 120 ka using stalagmites that formed in caves along the northern rim of the European Alps and find good agreement with the timing of climate changes in Greenland and the Asian monsoon.
Svante Björck, Jesper Sjolte, Karl Ljung, Florian Adolphi, Roger Flower, Rienk H. Smittenberg, Malin E. Kylander, Thomas F. Stocker, Sofia Holmgren, Hui Jiang, Raimund Muscheler, Yamoah K. K. Afrifa, Jayne E. Rattray, and Nathalie Van der Putten
Clim. Past, 15, 1939–1958, https://doi.org/10.5194/cp-15-1939-2019, https://doi.org/10.5194/cp-15-1939-2019, 2019
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Southern Hemisphere westerlies play a key role in regulating global climate. A lake sediment record on a mid-South Atlantic island shows changes in the westerlies and hydroclimate 36.4–18.6 ka. Before 31 ka the westerlies shifted in concert with the bipolar seesaw mechanism in a fairly warm climate, followed by southerly westerlies and falling temperatures. After 27.5 ka temperatures dropped 3 °C with drier conditions and with shifting westerlies possibly triggering the variable LGM CO2 levels.
Hubertus Fischer, Jochen Schmitt, Michael Bock, Barbara Seth, Fortunat Joos, Renato Spahni, Sebastian Lienert, Gianna Battaglia, Benjamin D. Stocker, Adrian Schilt, and Edward J. Brook
Biogeosciences, 16, 3997–4021, https://doi.org/10.5194/bg-16-3997-2019, https://doi.org/10.5194/bg-16-3997-2019, 2019
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N2O concentrations were subject to strong variations accompanying glacial–interglacial but also rapid climate changes over the last 21 kyr. The sources of these N2O changes can be identified by measuring the isotopic composition of N2O in ice cores and using the distinct isotopic composition of terrestrial and marine N2O. We show that both marine and terrestrial sources increased from the last glacial to the Holocene but that only terrestrial emissions responded quickly to rapid climate changes.
Damiano Della Lunga, Hörhold Maria, Birthe Twarloh, Behrens Melanie, Dallmayr Remi, Erhardt Tobias, Jensen Camille Marie, and Wilhelms Frank
The Cryosphere Discuss., https://doi.org/10.5194/tc-2019-215, https://doi.org/10.5194/tc-2019-215, 2019
Preprint withdrawn
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The extent of sea ice plays a major role in the present Arctic warming, and it is possibly one of its first victims, since it has been predicted to disappear in the near future, if warming proceed. Our manuscript validates ice core proxies for the reconstruction of the variability of sea ice extent around Greenland in the last 600 years, and simultanesouly infers the evolution of the proxy-sources with time. Understanding past sea ice extent variability, is thus crucial in predicting its future.
Johannes Sutter, Hubertus Fischer, Klaus Grosfeld, Nanna B. Karlsson, Thomas Kleiner, Brice Van Liefferinge, and Olaf Eisen
The Cryosphere, 13, 2023–2041, https://doi.org/10.5194/tc-13-2023-2019, https://doi.org/10.5194/tc-13-2023-2019, 2019
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The Antarctic Ice Sheet may have played an important role in moderating the transition between warm and cold climate epochs over the last million years. We find that the Antarctic Ice Sheet grew considerably about 0.9 Myr ago, a time when ice-age–warm-age cycles changed from a
40 000 to a 100 000 year periodicity. Our findings also suggest that ice as old as 1.5 Myr still exists at the bottom of the East Antarctic Ice Sheet despite the major climate reorganisations in the past.
Tobias Erhardt, Emilie Capron, Sune Olander Rasmussen, Simon Schüpbach, Matthias Bigler, Florian Adolphi, and Hubertus Fischer
Clim. Past, 15, 811–825, https://doi.org/10.5194/cp-15-811-2019, https://doi.org/10.5194/cp-15-811-2019, 2019
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The cause of the rapid warming events documented in proxy records across the Northern Hemisphere during the last glacial has been a long-standing puzzle in paleo-climate research. Here, we use high-resolution ice-core data from to cores in Greenland to investigate the progression during the onset of these events on multi-annual timescales to test their plausible triggers. We show that atmospheric circulation changes preceded the warming in Greenland and the collapse of the sea ice by a decade.
Mai Winstrup, Paul Vallelonga, Helle A. Kjær, Tyler J. Fudge, James E. Lee, Marie H. Riis, Ross Edwards, Nancy A. N. Bertler, Thomas Blunier, Ed J. Brook, Christo Buizert, Gabriela Ciobanu, Howard Conway, Dorthe Dahl-Jensen, Aja Ellis, B. Daniel Emanuelsson, Richard C. A. Hindmarsh, Elizabeth D. Keller, Andrei V. Kurbatov, Paul A. Mayewski, Peter D. Neff, Rebecca L. Pyne, Marius F. Simonsen, Anders Svensson, Andrea Tuohy, Edwin D. Waddington, and Sarah Wheatley
Clim. Past, 15, 751–779, https://doi.org/10.5194/cp-15-751-2019, https://doi.org/10.5194/cp-15-751-2019, 2019
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We present a 2700-year timescale and snow accumulation history for an ice core from Roosevelt Island, Ross Ice Shelf, Antarctica. We observe a long-term slightly decreasing trend in accumulation during most of the period but a rapid decline since the mid-1960s. The latter is linked to a recent strengthening of the Amundsen Sea Low and the expansion of regional sea ice. The year 1965 CE may thus mark the onset of significant increases in sea-ice extent in the eastern Ross Sea.
Chris S. M. Turney, Helen V. McGregor, Pierre Francus, Nerilie Abram, Michael N. Evans, Hugues Goosse, Lucien von Gunten, Darrell Kaufman, Hans Linderholm, Marie-France Loutre, and Raphael Neukom
Clim. Past, 15, 611–615, https://doi.org/10.5194/cp-15-611-2019, https://doi.org/10.5194/cp-15-611-2019, 2019
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This PAGES (Past Global Changes) 2k (climate of the past 2000 years working group) special issue of Climate of the Past brings together the latest understanding of regional change and impacts from PAGES 2k groups across a range of proxies and regions. The special issue has emerged from a need to determine the magnitude and rate of change of regional and global climate beyond the timescales accessible within the observational record.
Eleanor Rainsley, Chris S. M. Turney, Nicholas R. Golledge, Janet M. Wilmshurst, Matt S. McGlone, Alan G. Hogg, Bo Li, Zoë A. Thomas, Richard Roberts, Richard T. Jones, Jonathan G. Palmer, Verity Flett, Gregory de Wet, David K. Hutchinson, Mathew J. Lipson, Pavla Fenwick, Ben R. Hines, Umberto Binetti, and Christopher J. Fogwill
Clim. Past, 15, 423–448, https://doi.org/10.5194/cp-15-423-2019, https://doi.org/10.5194/cp-15-423-2019, 2019
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The New Zealand subantarctic islands, in the Pacific sector of the Southern Ocean, provide valuable records of past environmental change. We find that the Auckland Islands hosted a small ice cap around 384 000 years ago, but that there was little glaciation during the Last Glacial Maximum, around 21 000 years ago, in contrast to mainland New Zealand. This shows that the climate here is susceptible to changes in regional factors such as sea-ice expanse and the position of ocean fronts.
Amy J. Dougherty, Jeong-Heon Choi, Chris S. M. Turney, and Anthony Dosseto
Clim. Past, 15, 389–404, https://doi.org/10.5194/cp-15-389-2019, https://doi.org/10.5194/cp-15-389-2019, 2019
Hanying Li, Hai Cheng, Ashish Sinha, Gayatri Kathayat, Christoph Spötl, Aurèle Anquetil André, Arnaud Meunier, Jayant Biswas, Pengzhen Duan, Youfeng Ning, and Richard Lawrence Edwards
Clim. Past, 14, 1881–1891, https://doi.org/10.5194/cp-14-1881-2018, https://doi.org/10.5194/cp-14-1881-2018, 2018
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The
4.2 ka eventbetween 4.2 and 3.9 ka has been widely discussed in the Northern Hemsiphere but less reported in the Southern Hemisphere. Here, we use speleothem records from Rodrigues in the southwestern Indian Ocean spanning from 6000 to 3000 years ago to investigate the regional hydro-climatic variability. Our records show no evidence for an unusual climate anomaly between 4.2 and 3.9 ka. Instead, it shows a multi-centennial drought between 3.9 and 3.5 ka.
Jonas Beck, Michael Bock, Jochen Schmitt, Barbara Seth, Thomas Blunier, and Hubertus Fischer
Biogeosciences, 15, 7155–7175, https://doi.org/10.5194/bg-15-7155-2018, https://doi.org/10.5194/bg-15-7155-2018, 2018
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Ice core concentration and stable isotope measurements of atmospheric CH4 give valuable insights into the CH4 cycle of the past. New carbon and hydrogen stable isotope CH4 data measured on ice from both Greenland and Antarctica over the Holocene allow us to draw conclusions on the methane emission processes. In particular, our results cast doubt on a hypothesis proposing early human land use to be responsible for the atmospheric methane concentration increase in the second half of the Holocene.
Gayatri Kathayat, Hai Cheng, Ashish Sinha, Max Berkelhammer, Haiwei Zhang, Pengzhen Duan, Hanying Li, Xianglei Li, Youfeng Ning, and R. Lawrence Edwards
Clim. Past, 14, 1869–1879, https://doi.org/10.5194/cp-14-1869-2018, https://doi.org/10.5194/cp-14-1869-2018, 2018
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The 4.2 ka event is generally characterized as an approximately 300-year period of major global climate anomaly. However, the climatic manifestation of this event remains unclear in the Indian monsoon domain. Our high-resolution and precisely dated speleothem record from Meghalaya, India, characterizes the event as consisting of a series of multi-decadal droughts between 3.9 and 4.0 ka rather than a singular pulse of multi-centennial drought as previously thought.
Haiwei Zhang, Hai Cheng, Yanjun Cai, Christoph Spötl, Gayatri Kathayat, Ashish Sinha, R. Lawrence Edwards, and Liangcheng Tan
Clim. Past, 14, 1805–1817, https://doi.org/10.5194/cp-14-1805-2018, https://doi.org/10.5194/cp-14-1805-2018, 2018
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The collapses of several Neolithic cultures in China are considered to have been associated with abrupt climate change during the 4.2 ka BP event; however, the hydroclimate of this event in China is still poorly known. Based on stalagmite records from monsoonal China, we found that north China was dry but south China was wet during this event. We propose that the rain belt remained longer at its southern position, giving rise to a pronounced humidity gradient between north and south China.
Zoë A. Thomas, Richard T. Jones, Chris J. Fogwill, Jackie Hatton, Alan N. Williams, Alan Hogg, Scott Mooney, Philip Jones, David Lister, Paul Mayewski, and Chris S. M. Turney
Clim. Past, 14, 1727–1738, https://doi.org/10.5194/cp-14-1727-2018, https://doi.org/10.5194/cp-14-1727-2018, 2018
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We report a high-resolution study of a 5000-year-long peat record from the Falkland Islands. This area sensitive to the dynamics of the Amundsen Sea Low, which plays a major role in modulating the Southern Ocean climate. We find wetter, colder conditions between 5.0 and 2.5 ka due to enhanced southerly airflow, with the establishment of drier and warmer conditions from 2.5 ka to present. This implies more westerly airflow and the increased projection of the ASL onto the South Atlantic.
Jesper Sjolte, Christophe Sturm, Florian Adolphi, Bo M. Vinther, Martin Werner, Gerrit Lohmann, and Raimund Muscheler
Clim. Past, 14, 1179–1194, https://doi.org/10.5194/cp-14-1179-2018, https://doi.org/10.5194/cp-14-1179-2018, 2018
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Tropical volcanic eruptions and variations in solar activity have been suggested to influence the strength of westerly winds across the North Atlantic. We use Greenland ice core records together with a climate model simulation, and find stronger westerly winds for five winters following tropical volcanic eruptions. We see a delayed response to solar activity of 5 years, and the response to solar minima corresponds well to the cooling pattern during the period known as the Little Ice Age.
Minjie Zheng, Jesper Sjolte, Florian Adolphi, Bo Møllesøe Vinther, Hans Christian Steen-Larsen, Trevor James Popp, and Raimund Muscheler
Clim. Past, 14, 1067–1078, https://doi.org/10.5194/cp-14-1067-2018, https://doi.org/10.5194/cp-14-1067-2018, 2018
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We show the seasonal δ18O data from the NEEM site in northwestern Greenland over the last 150 years. We found that the NEEM summer δ18O signal correlates well with summer temperature in western coastal Greenland, while the NEEM winter δ18O signal correlates well with sea ice concentration in Baffin Bay. In contrast with the winter δ18O data from central/southern Greenland, we find no linkage of NEEM winter δ18O to winter NAO.
Markus Czymzik, Raimund Muscheler, Florian Adolphi, Florian Mekhaldi, Nadine Dräger, Florian Ott, Michał Słowinski, Mirosław Błaszkiewicz, Ala Aldahan, Göran Possnert, and Achim Brauer
Clim. Past, 14, 687–696, https://doi.org/10.5194/cp-14-687-2018, https://doi.org/10.5194/cp-14-687-2018, 2018
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Our results provide a proof of concept for facilitating 10Be in varved lake sediments as a novel synchronization tool required for investigating leads and lags of proxy responses to climate variability. They also point to some limitations of 10Be in these archives mainly connected to in-lake sediment resuspension processes.
Marius Folden Simonsen, Llorenç Cremonesi, Giovanni Baccolo, Samuel Bosch, Barbara Delmonte, Tobias Erhardt, Helle Astrid Kjær, Marco Potenza, Anders Svensson, and Paul Vallelonga
Clim. Past, 14, 601–608, https://doi.org/10.5194/cp-14-601-2018, https://doi.org/10.5194/cp-14-601-2018, 2018
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Ice core dust size distributions are more often measured today by an Abakus laser sensor than by the more technically demanding but also very accurate Coulter counter. However, Abakus measurements consistently give larger particle sizes. We show here that this bias exists because the particles are flat and elongated. Correcting for this gives more accurate Abakus measurements. Furthermore, the shape of the particles can be extracted from a combination of Coulter counter and Abakus measurements.
Masa Kageyama, Pascale Braconnot, Sandy P. Harrison, Alan M. Haywood, Johann H. Jungclaus, Bette L. Otto-Bliesner, Jean-Yves Peterschmitt, Ayako Abe-Ouchi, Samuel Albani, Patrick J. Bartlein, Chris Brierley, Michel Crucifix, Aisling Dolan, Laura Fernandez-Donado, Hubertus Fischer, Peter O. Hopcroft, Ruza F. Ivanovic, Fabrice Lambert, Daniel J. Lunt, Natalie M. Mahowald, W. Richard Peltier, Steven J. Phipps, Didier M. Roche, Gavin A. Schmidt, Lev Tarasov, Paul J. Valdes, Qiong Zhang, and Tianjun Zhou
Geosci. Model Dev., 11, 1033–1057, https://doi.org/10.5194/gmd-11-1033-2018, https://doi.org/10.5194/gmd-11-1033-2018, 2018
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The Paleoclimate Modelling Intercomparison Project (PMIP) takes advantage of the existence of past climate states radically different from the recent past to test climate models used for climate projections and to better understand these climates. This paper describes the PMIP contribution to CMIP6 (Coupled Model Intercomparison Project, 6th phase) and possible analyses based on PMIP results, as well as on other CMIP6 projects.
Gabriella Koltai, Hai Cheng, and Christoph Spötl
Clim. Past, 14, 369–381, https://doi.org/10.5194/cp-14-369-2018, https://doi.org/10.5194/cp-14-369-2018, 2018
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Here we present a multi-proxy study of flowstones in fractures of crystalline rocks with the aim of assessing the palaeoclimate significance of this new type of speleothem archive. Our results indicate a high degree of spatial heterogeneity, whereby changes in speleothem mineralogy and carbon isotope composition are likely governed by aquifer-internal processes. In contrast, the oxygen isotope composition reflects first-order climate variability.
Taku Umezawa, Carl A. M. Brenninkmeijer, Thomas Röckmann, Carina van der Veen, Stanley C. Tyler, Ryo Fujita, Shinji Morimoto, Shuji Aoki, Todd Sowers, Jochen Schmitt, Michael Bock, Jonas Beck, Hubertus Fischer, Sylvia E. Michel, Bruce H. Vaughn, John B. Miller, James W. C. White, Gordon Brailsford, Hinrich Schaefer, Peter Sperlich, Willi A. Brand, Michael Rothe, Thomas Blunier, David Lowry, Rebecca E. Fisher, Euan G. Nisbet, Andrew L. Rice, Peter Bergamaschi, Cordelia Veidt, and Ingeborg Levin
Atmos. Meas. Tech., 11, 1207–1231, https://doi.org/10.5194/amt-11-1207-2018, https://doi.org/10.5194/amt-11-1207-2018, 2018
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Isotope measurements are useful for separating different methane sources. However, the lack of widely accepted standards and calibration methods for stable carbon and hydrogen isotopic ratios of methane in air has caused significant measurement offsets among laboratories. We conducted worldwide interlaboratory comparisons, surveyed the literature and assessed them systematically. This study may be of help in future attempts to harmonize data sets of isotopic composition of atmospheric methane.
Pascal Bohleber, Tobias Erhardt, Nicole Spaulding, Helene Hoffmann, Hubertus Fischer, and Paul Mayewski
Clim. Past, 14, 21–37, https://doi.org/10.5194/cp-14-21-2018, https://doi.org/10.5194/cp-14-21-2018, 2018
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The Colle Gnifetti (CG) glacier is the only drilling site in the European Alps offering ice core records back to some 1000 years. We aim to fully exploit these unique long-term records by establishing a reliable long-term age scale and an improved ice core proxy interpretation for reconstructing temperature. Our findings reveal a site-specific temperature-related signal in the trends of the mineral dust proxy Ca2+ that may supplement other proxy evidence over the last millennium.
Niklas Boers, Mickael D. Chekroun, Honghu Liu, Dmitri Kondrashov, Denis-Didier Rousseau, Anders Svensson, Matthias Bigler, and Michael Ghil
Earth Syst. Dynam., 8, 1171–1190, https://doi.org/10.5194/esd-8-1171-2017, https://doi.org/10.5194/esd-8-1171-2017, 2017
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We use a Bayesian approach for inferring inverse, stochastic–dynamic models from northern Greenland (NGRIP) oxygen and dust records of subdecadal resolution for the interval 59 to 22 ka b2k. Our model reproduces the statistical and dynamical characteristics of the records, including the Dansgaard–Oeschger variability, with no need for external forcing. The crucial ingredients are cubic drift terms, nonlinear coupling terms between the oxygen and dust time series, and non-Markovian contributions.
Ny Riavo Gilbertinie Voarintsoa, Loren Bruce Railsback, George Albert Brook, Lixin Wang, Gayatri Kathayat, Hai Cheng, Xianglei Li, Richard Lawrence Edwards, Amos Fety Michel Rakotondrazafy, and Marie Olga Madison Razanatseheno
Clim. Past, 13, 1771–1790, https://doi.org/10.5194/cp-13-1771-2017, https://doi.org/10.5194/cp-13-1771-2017, 2017
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This research has been an investigation of two stalagmites from two caves in NW Madagascar to reconstruct the region's paleoenvironmental changes, and to understand the linkage of such changes to the dynamics of the ITCZ. Stable isotopes, mineralogy, and petrography suggest wetter climate conditions than today during the early and late Holocene, when the mean ITCZ was south, and drier during the mid-Holocene when the ITCZ was north.
Johann H. Jungclaus, Edouard Bard, Mélanie Baroni, Pascale Braconnot, Jian Cao, Louise P. Chini, Tania Egorova, Michael Evans, J. Fidel González-Rouco, Hugues Goosse, George C. Hurtt, Fortunat Joos, Jed O. Kaplan, Myriam Khodri, Kees Klein Goldewijk, Natalie Krivova, Allegra N. LeGrande, Stephan J. Lorenz, Jürg Luterbacher, Wenmin Man, Amanda C. Maycock, Malte Meinshausen, Anders Moberg, Raimund Muscheler, Christoph Nehrbass-Ahles, Bette I. Otto-Bliesner, Steven J. Phipps, Julia Pongratz, Eugene Rozanov, Gavin A. Schmidt, Hauke Schmidt, Werner Schmutz, Andrew Schurer, Alexander I. Shapiro, Michael Sigl, Jason E. Smerdon, Sami K. Solanki, Claudia Timmreck, Matthew Toohey, Ilya G. Usoskin, Sebastian Wagner, Chi-Ju Wu, Kok Leng Yeo, Davide Zanchettin, Qiong Zhang, and Eduardo Zorita
Geosci. Model Dev., 10, 4005–4033, https://doi.org/10.5194/gmd-10-4005-2017, https://doi.org/10.5194/gmd-10-4005-2017, 2017
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Climate model simulations covering the last millennium provide context for the evolution of the modern climate and for the expected changes during the coming centuries. They can help identify plausible mechanisms underlying palaeoclimatic reconstructions. Here, we describe the forcing boundary conditions and the experimental protocol for simulations covering the pre-industrial millennium. We describe the PMIP4 past1000 simulations as contributions to CMIP6 and additional sensitivity experiments.
Bette L. Otto-Bliesner, Pascale Braconnot, Sandy P. Harrison, Daniel J. Lunt, Ayako Abe-Ouchi, Samuel Albani, Patrick J. Bartlein, Emilie Capron, Anders E. Carlson, Andrea Dutton, Hubertus Fischer, Heiko Goelzer, Aline Govin, Alan Haywood, Fortunat Joos, Allegra N. LeGrande, William H. Lipscomb, Gerrit Lohmann, Natalie Mahowald, Christoph Nehrbass-Ahles, Francesco S. R. Pausata, Jean-Yves Peterschmitt, Steven J. Phipps, Hans Renssen, and Qiong Zhang
Geosci. Model Dev., 10, 3979–4003, https://doi.org/10.5194/gmd-10-3979-2017, https://doi.org/10.5194/gmd-10-3979-2017, 2017
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The PMIP4 and CMIP6 mid-Holocene and Last Interglacial simulations provide an opportunity to examine the impact of two different changes in insolation forcing on climate at times when other forcings were relatively similar to present. This will allow exploration of the role of feedbacks relevant to future projections. Evaluating these simulations using paleoenvironmental data will provide direct out-of-sample tests of the reliability of state-of-the-art models to simulate climate changes.
Frédéric Parrenin, Marie G. P. Cavitte, Donald D. Blankenship, Jérôme Chappellaz, Hubertus Fischer, Olivier Gagliardini, Valérie Masson-Delmotte, Olivier Passalacqua, Catherine Ritz, Jason Roberts, Martin J. Siegert, and Duncan A. Young
The Cryosphere, 11, 2427–2437, https://doi.org/10.5194/tc-11-2427-2017, https://doi.org/10.5194/tc-11-2427-2017, 2017
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The oldest dated deep ice core drilled in Antarctica has been retrieved at EPICA Dome C (EDC), reaching ~ 800 000 years. Obtaining an older palaeoclimatic record from Antarctica is one of the greatest challenges of the ice core community. Here, we estimate the age of basal ice in the Dome C area. We find that old ice (> 1.5 Myr) likely exists in two regions a few tens of kilometres away from EDC:
Little Dome C Patchand
North Patch.
Denis-Didier Rousseau, Anders Svensson, Matthias Bigler, Adriana Sima, Jorgen Peder Steffensen, and Niklas Boers
Clim. Past, 13, 1181–1197, https://doi.org/10.5194/cp-13-1181-2017, https://doi.org/10.5194/cp-13-1181-2017, 2017
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We show that the analysis of δ18O and dust in the Greenland ice cores, and a critical study of their source variations, reconciles these records with those observed on the Eurasian continent. We demonstrate the link between European and Chinese loess sequences, dust records in Greenland, and variations in the North Atlantic sea ice extent. The sources of the emitted and transported dust material are variable and relate to different environments.
Peter Köhler, Christoph Nehrbass-Ahles, Jochen Schmitt, Thomas F. Stocker, and Hubertus Fischer
Earth Syst. Sci. Data, 9, 363–387, https://doi.org/10.5194/essd-9-363-2017, https://doi.org/10.5194/essd-9-363-2017, 2017
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We document our best available data compilation of published ice core records of the greenhouse gases CO2, CH4, and N2O and recent measurements on firn air and atmospheric samples covering the time window from 156 000 years BP to the beginning of the year 2016 CE. A smoothing spline method is applied to translate the discrete and irregularly spaced data points into continuous time series. The radiative forcing for each greenhouse gas is computed using well-established, simple formulations.
Damiano Della Lunga, Wolfgang Müller, Sune Olander Rasmussen, Anders Svensson, and Paul Vallelonga
The Cryosphere, 11, 1297–1309, https://doi.org/10.5194/tc-11-1297-2017, https://doi.org/10.5194/tc-11-1297-2017, 2017
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In our study we combined the wealth of information provided by Greenland ice cores with an ultra-high-resolution technique well known in geoscience (laser ablation). Our set-up was developed and applied to investigate the variability in concentration of ions across a rapid climatic change from the oldest part of the last glaciation, showing that concentrations drop abruptly from cold to warm periods, representing a shift in atmospheric transport that happens even faster than previously thought.
Chris S.~M. Turney, Andrew Klekociuk, Christopher J. Fogwill, Violette Zunz, Hugues Goosse, Claire L. Parkinson, Gilbert Compo, Matthew Lazzara, Linda Keller, Rob Allan, Jonathan G. Palmer, Graeme Clark, and Ezequiel Marzinelli
The Cryosphere Discuss., https://doi.org/10.5194/tc-2017-51, https://doi.org/10.5194/tc-2017-51, 2017
Revised manuscript not accepted
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We demonstrate that a mid-twentieth century decrease in geopotential height in the southwest Pacific marks a Rossby wave response to equatorial Pacific warming, leading to enhanced easterly airflow off George V Land. Our results suggest that in contrast to ozone hole-driven changes in the Amundsen Sea, the 1979–2015 increase in sea ice extent off George V Land may be in response to reduced northward Ekman drift and enhanced (near-coast) production as a consequence of low latitude forcing.
Chris S. M. Turney, Christopher J. Fogwill, Jonathan G. Palmer, Erik van Sebille, Zoë Thomas, Matt McGlone, Sarah Richardson, Janet M. Wilmshurst, Pavla Fenwick, Violette Zunz, Hugues Goosse, Kerry-Jayne Wilson, Lionel Carter, Mathew Lipson, Richard T. Jones, Melanie Harsch, Graeme Clark, Ezequiel Marzinelli, Tracey Rogers, Eleanor Rainsley, Laura Ciasto, Stephanie Waterman, Elizabeth R. Thomas, and Martin Visbeck
Clim. Past, 13, 231–248, https://doi.org/10.5194/cp-13-231-2017, https://doi.org/10.5194/cp-13-231-2017, 2017
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The Southern Ocean plays a fundamental role in global climate but suffers from a dearth of observational data. As the Australasian Antarctic Expedition 2013–2014 we have developed the first annually resolved temperature record using trees from subantarctic southwest Pacific (52–54˚S) to extend the climate record back to 1870. With modelling we show today's high climate variability became established in the ~1940s and likely driven by a Rossby wave response originating from the tropical Pacific.
Grant M. Raisbeck, Alexandre Cauquoin, Jean Jouzel, Amaelle Landais, Jean-Robert Petit, Vladimir Y. Lipenkov, Juerg Beer, Hans-Arno Synal, Hans Oerter, Sigfus J. Johnsen, Jorgen P. Steffensen, Anders Svensson, and Françoise Yiou
Clim. Past, 13, 217–229, https://doi.org/10.5194/cp-13-217-2017, https://doi.org/10.5194/cp-13-217-2017, 2017
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Using records of a long-lived radioactive nuclide (10Be) that is formed globally in the atmosphere and deposited within a few years to the earth’s surface, we have synchronized three Antarctic ice cores to one from Greenland. This permits the climate and other environmental parameters registered in these ice cores to be put on a common timescale with a precision of a few decades, thus allowing different models and mechanisms associated with these parameters to be tested with the same precision.
Christopher J. Fogwill, Erik van Sebille, Eva A. Cougnon, Chris S. M. Turney, Steve R. Rintoul, Benjamin K. Galton-Fenzi, Graeme F. Clark, E. M. Marzinelli, Eleanor B. Rainsley, and Lionel Carter
The Cryosphere, 10, 2603–2609, https://doi.org/10.5194/tc-10-2603-2016, https://doi.org/10.5194/tc-10-2603-2016, 2016
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Here we report new data from in situ oceanographic surveys and high-resolution ocean modelling experiments in the Commonwealth Bay region of East Antarctica, where in 2010 there was a major reconfiguration of the regional icescape due to the collision of the 97 km long iceberg B09B with the Mertz Glacier tongue. Here we compare post-calving observations with high-resolution ocean modelling which suggest that this reconfiguration has led to the development of a new polynya off Commonwealth Bay.
Michel Legrand, Joseph McConnell, Hubertus Fischer, Eric W. Wolff, Susanne Preunkert, Monica Arienzo, Nathan Chellman, Daiana Leuenberger, Olivia Maselli, Philip Place, Michael Sigl, Simon Schüpbach, and Mike Flannigan
Clim. Past, 12, 2033–2059, https://doi.org/10.5194/cp-12-2033-2016, https://doi.org/10.5194/cp-12-2033-2016, 2016
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Here, we review previous attempts made to reconstruct past forest fire using chemical signals recorded in Greenland ice. We showed that the Greenland ice records of ammonium, found to be a good fire proxy, consistently indicate changing fire activity in Canada in response to past climatic conditions that occurred since the last 15 000 years, including the Little Ice Age and the last large climatic transition.
Bette L. Otto-Bliesner, Pascale Braconnot, Sandy P. Harrison, Daniel J. Lunt, Ayako Abe-Ouchi, Samuel Albani, Patrick J. Bartlein, Emilie Capron, Anders E. Carlson, Andrea Dutton, Hubertus Fischer, Heiko Goelzer, Aline Govin, Alan Haywood, Fortunat Joos, Allegra N. Legrande, William H. Lipscomb, Gerrit Lohmann, Natalie Mahowald, Christoph Nehrbass-Ahles, Jean-Yves Peterschmidt, Francesco S.-R. Pausata, Steven Phipps, and Hans Renssen
Clim. Past Discuss., https://doi.org/10.5194/cp-2016-106, https://doi.org/10.5194/cp-2016-106, 2016
Preprint retracted
Olivier Eicher, Matthias Baumgartner, Adrian Schilt, Jochen Schmitt, Jakob Schwander, Thomas F. Stocker, and Hubertus Fischer
Clim. Past, 12, 1979–1993, https://doi.org/10.5194/cp-12-1979-2016, https://doi.org/10.5194/cp-12-1979-2016, 2016
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A new high-resolution total air content record over the NGRIP ice core, spanning 0.3–120 kyr is presented. In agreement with Antarctic ice cores, we find a strong local insolation signature but also 3–5 % decreases in total air content as a local response to Dansgaard–Oeschger events, which can only partly be explained by changes in surface pressure and temperature. Accordingly, a dynamic response of firnification to rapid climate changes on the Greenland ice sheet must have occurred.
Steven J. Phipps, Christopher J. Fogwill, and Christian S. M. Turney
The Cryosphere, 10, 2317–2328, https://doi.org/10.5194/tc-10-2317-2016, https://doi.org/10.5194/tc-10-2317-2016, 2016
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We explore the effects of melting of the East Antarctic Ice Sheet on the Southern Ocean. Using a climate model, we find that melting changes the ocean circulation and causes warming of more than 1 °C at depth. We also discover the potential existence of a "domino effect", whereby the initial warming spreads westwards around the Antarctic continent. Melting of just one sector could therefore destabilise the wider Antarctic Ice Sheet, leading to substantial increases in global sea level.
Amaelle Landais, Valérie Masson-Delmotte, Emilie Capron, Petra M. Langebroek, Pepijn Bakker, Emma J. Stone, Niklaus Merz, Christoph C. Raible, Hubertus Fischer, Anaïs Orsi, Frédéric Prié, Bo Vinther, and Dorthe Dahl-Jensen
Clim. Past, 12, 1933–1948, https://doi.org/10.5194/cp-12-1933-2016, https://doi.org/10.5194/cp-12-1933-2016, 2016
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The last lnterglacial (LIG; 116 000 to 129 000 years before present) surface temperature at the upstream Greenland NEEM deposition site is estimated to be warmer by +7 to +11 °C compared to the preindustrial period. We show that under such warm temperatures, melting of snow probably led to a significant surface melting. There is a paradox between the extent of the Greenland ice sheet during the LIG and the strong warming during this period that models cannot solve.
Thomas Röckmann, Simon Eyer, Carina van der Veen, Maria E. Popa, Béla Tuzson, Guillaume Monteil, Sander Houweling, Eliza Harris, Dominik Brunner, Hubertus Fischer, Giulia Zazzeri, David Lowry, Euan G. Nisbet, Willi A. Brand, Jaroslav M. Necki, Lukas Emmenegger, and Joachim Mohn
Atmos. Chem. Phys., 16, 10469–10487, https://doi.org/10.5194/acp-16-10469-2016, https://doi.org/10.5194/acp-16-10469-2016, 2016
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A dual isotope ratio mass spectrometric system (IRMS) and a quantum cascade laser absorption spectroscopy (QCLAS)-based technique were deployed at the Cabauw experimental site for atmospheric research (CESAR) in the Netherlands and performed in situ, high-frequency (approx. hourly) measurements for a period of more than 5 months, yielding a combined dataset with more than 2500 measurements of both δ13C and δD.
Stef Vansteenberge, Sophie Verheyden, Hai Cheng, R. Lawrence Edwards, Eddy Keppens, and Philippe Claeys
Clim. Past, 12, 1445–1458, https://doi.org/10.5194/cp-12-1445-2016, https://doi.org/10.5194/cp-12-1445-2016, 2016
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The use of stalagmites for last interglacial continental climate reconstructions in Europe has been successful in the past; however to expand the geographical coverage, additional data from Belgium is presented. It has been shown that stalagmite growth, morphology and stable isotope content reflect regional and local climate conditions, with Eemian optimum climate occurring between 125.3 and 117.3 ka. The start the Weichselian is expressed by a stop of growth caused by a drying climate.
Markus Czymzik, Raimund Muscheler, and Achim Brauer
Clim. Past, 12, 799–805, https://doi.org/10.5194/cp-12-799-2016, https://doi.org/10.5194/cp-12-799-2016, 2016
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Integrating discharge data of the River Ammer back to 1926 and a 5500-year flood layer record from an annually laminated sediment core of the downstream Ammersee allowed investigating changes in the frequency of major floods in Central Europe on interannual to multi-centennial timescales. Significant correlations between flood frequency variations in both archives and changes in the activity of the Sun suggest a solar influence on the frequency of these hydrometeorological extremes.
Michael Sigl, Tyler J. Fudge, Mai Winstrup, Jihong Cole-Dai, David Ferris, Joseph R. McConnell, Ken C. Taylor, Kees C. Welten, Thomas E. Woodruff, Florian Adolphi, Marion Bisiaux, Edward J. Brook, Christo Buizert, Marc W. Caffee, Nelia W. Dunbar, Ross Edwards, Lei Geng, Nels Iverson, Bess Koffman, Lawrence Layman, Olivia J. Maselli, Kenneth McGwire, Raimund Muscheler, Kunihiko Nishiizumi, Daniel R. Pasteris, Rachael H. Rhodes, and Todd A. Sowers
Clim. Past, 12, 769–786, https://doi.org/10.5194/cp-12-769-2016, https://doi.org/10.5194/cp-12-769-2016, 2016
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Here we present a chronology (WD2014) for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide ice core, which is based on layer counting of distinctive annual cycles preserved in the elemental, chemical and electrical conductivity records. We validated the chronology by comparing it to independent high-accuracy, absolutely dated chronologies. Given its demonstrated high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere.
C. S. M. Turney, R. T. Jones, C. Fogwill, J. Hatton, A. N. Williams, A. Hogg, Z. A. Thomas, J. Palmer, S. Mooney, and R. W. Reimer
Clim. Past, 12, 189–200, https://doi.org/10.5194/cp-12-189-2016, https://doi.org/10.5194/cp-12-189-2016, 2016
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Southern Hemisphere westerly airflow is considered a major driver of Southern Ocean and global climate. Observational records, however, are limited. Here we present a new Falkland Islands record that exploits "exotic" South America pollen and charcoal to reconstruct changing airflow. We find stronger winds 2000–1000 cal. yr BP, associated with increased burning, and a 250-year periodicity, suggesting solar forcing. Our results have important implications for understanding late Holocene climates.
S. Eyer, B. Tuzson, M. E. Popa, C. van der Veen, T. Röckmann, M. Rothe, W. A. Brand, R. Fisher, D. Lowry, E. G. Nisbet, M. S. Brennwald, E. Harris, C. Zellweger, L. Emmenegger, H. Fischer, and J. Mohn
Atmos. Meas. Tech., 9, 263–280, https://doi.org/10.5194/amt-9-263-2016, https://doi.org/10.5194/amt-9-263-2016, 2016
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We present a newly developed field-deployable, autonomous platform simultaneously measuring the three most abundant isotopologues of methane using mid-infrared laser absorption spectroscopy.
The instrument consists of a compact quantum cascade laser absorption spectrometer (QCLAS) coupled to a preconcentration unit, called TRace gas EXtractor (TREX).
The performance of this new in situ technique was investigated during a 2-week measurement campaign and compared to other techniques.
F. Adolphi and R. Muscheler
Clim. Past, 12, 15–30, https://doi.org/10.5194/cp-12-15-2016, https://doi.org/10.5194/cp-12-15-2016, 2016
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Here we employ common variations in tree-ring 14C and Greenland ice core 10Be records to synchronize the Greenland ice core (GICC05) and the radiocarbon (IntCal13) timescale over the Holocene. We propose a transfer function between both timescales that allows continuous comparisons between radiocarbon dated and ice core climate records at unprecedented chronological precision.
C. S. M. Turney, C. J. Fogwill, A. R. Klekociuk, T. D. van Ommen, M. A. J. Curran, A. D. Moy, and J. G. Palmer
The Cryosphere, 9, 2405–2415, https://doi.org/10.5194/tc-9-2405-2015, https://doi.org/10.5194/tc-9-2405-2015, 2015
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Recent trends in ocean circulation, sea ice and climate over the Southern Ocean and Antarctica are highly complex. Here we report a new snow core from the South Pole alongside reanalysis of 20th century global atmospheric circulation. We demonstrate for the first time that atmospheric pressure anomalies in the mid-latitudes act as "gatekeepers" to meridional exchange over continental Antarctica, modulated by the tropical Pacific, with potentially significant impacts on surface mass balance.
Z. A. Thomas, F. Kwasniok, C. A. Boulton, P. M. Cox, R. T. Jones, T. M. Lenton, and C. S. M. Turney
Clim. Past, 11, 1621–1633, https://doi.org/10.5194/cp-11-1621-2015, https://doi.org/10.5194/cp-11-1621-2015, 2015
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Using a combination of speleothem records and model simulations of the East Asian Monsoon over the penultimate glacial cycle, we search for early warning signals of past tipping points. We detect a characteristic slower response to perturbations prior to an abrupt monsoon shift at the glacial termination; however, we do not detect these signals in the preceding shifts. Our results have important implications for detecting tipping points in palaeoclimate records outside glacial terminations.
A. Svensson, S. Fujita, M. Bigler, M. Braun, R. Dallmayr, V. Gkinis, K. Goto-Azuma, M. Hirabayashi, K. Kawamura, S. Kipfstuhl, H. A. Kjær, T. Popp, M. Simonsen, J. P. Steffensen, P. Vallelonga, and B. M. Vinther
Clim. Past, 11, 1127–1137, https://doi.org/10.5194/cp-11-1127-2015, https://doi.org/10.5194/cp-11-1127-2015, 2015
G. van der Wel, H. Fischer, H. Oerter, H. Meyer, and H. A. J. Meijer
The Cryosphere, 9, 1601–1616, https://doi.org/10.5194/tc-9-1601-2015, https://doi.org/10.5194/tc-9-1601-2015, 2015
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The diffusion of the stable water isotope signal during firnification of snow is a temperature-dependent process. Therefore, past local temperatures can be derived from the differential diffusion length. In this paper we develop a new method for determining this quantity and compare it with the existing method. Both methods are applied to a large number of synthetic data sets to assess the precision and accuracy of the reconstruction and to a section of the Antarctic EDML ice core record.
J.-L. Tison, M. de Angelis, G. Littot, E. Wolff, H. Fischer, M. Hansson, M. Bigler, R. Udisti, A. Wegner, J. Jouzel, B. Stenni, S. Johnsen, V. Masson-Delmotte, A. Landais, V. Lipenkov, L. Loulergue, J.-M. Barnola, J.-R. Petit, B. Delmonte, G. Dreyfus, D. Dahl-Jensen, G. Durand, B. Bereiter, A. Schilt, R. Spahni, K. Pol, R. Lorrain, R. Souchez, and D. Samyn
The Cryosphere, 9, 1633–1648, https://doi.org/10.5194/tc-9-1633-2015, https://doi.org/10.5194/tc-9-1633-2015, 2015
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The oldest paleoclimatic information is buried within the lowermost layers of deep ice cores. It is therefore essential to judge how deep these records remain unaltered. We study the bottom 60 meters of the EPICA Dome C ice core from central Antarctica to show that the paleoclimatic signal is only affected at the small scale (decimeters) in terms of some of the global ice properties. However our data suggest that the time scale has been considerably distorted by mechanical stretching.
A. Rouillard, G. Skrzypek, S. Dogramaci, C. Turney, and P. F. Grierson
Hydrol. Earth Syst. Sci., 19, 2057–2078, https://doi.org/10.5194/hess-19-2057-2015, https://doi.org/10.5194/hess-19-2057-2015, 2015
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We reconstructed a 100-year monthly history of flooding and drought of a large wetland in arid northwest Australia, using hydroclimatic data calibrated against 25 years of satellite images. Severe and intense regional rainfall, as well as the sequence of events, determined surface water expression on the floodplain. While inter-annual variability was high, changes to the flood regime over the last 20 years suggest the wetland may become more persistent in response to the observed rainfall trend.
P. Vallelonga, K. Christianson, R. B. Alley, S. Anandakrishnan, J. E. M. Christian, D. Dahl-Jensen, V. Gkinis, C. Holme, R. W. Jacobel, N. B. Karlsson, B. A. Keisling, S. Kipfstuhl, H. A. Kjær, M. E. L. Kristensen, A. Muto, L. E. Peters, T. Popp, K. L. Riverman, A. M. Svensson, C. Tibuleac, B. M. Vinther, Y. Weng, and M. Winstrup
The Cryosphere, 8, 1275–1287, https://doi.org/10.5194/tc-8-1275-2014, https://doi.org/10.5194/tc-8-1275-2014, 2014
M. Bock, J. Schmitt, J. Beck, R. Schneider, and H. Fischer
Atmos. Meas. Tech., 7, 1999–2012, https://doi.org/10.5194/amt-7-1999-2014, https://doi.org/10.5194/amt-7-1999-2014, 2014
M. Montagnat, N. Azuma, D. Dahl-Jensen, J. Eichler, S. Fujita, F. Gillet-Chaulet, S. Kipfstuhl, D. Samyn, A. Svensson, and I. Weikusat
The Cryosphere, 8, 1129–1138, https://doi.org/10.5194/tc-8-1129-2014, https://doi.org/10.5194/tc-8-1129-2014, 2014
M. Baumgartner, P. Kindler, O. Eicher, G. Floch, A. Schilt, J. Schwander, R. Spahni, E. Capron, J. Chappellaz, M. Leuenberger, H. Fischer, and T. F. Stocker
Clim. Past, 10, 903–920, https://doi.org/10.5194/cp-10-903-2014, https://doi.org/10.5194/cp-10-903-2014, 2014
S. Schüpbach, U. Federer, P. R. Kaufmann, S. Albani, C. Barbante, T. F. Stocker, and H. Fischer
Clim. Past, 9, 2789–2807, https://doi.org/10.5194/cp-9-2789-2013, https://doi.org/10.5194/cp-9-2789-2013, 2013
S. O. Rasmussen, P. M. Abbott, T. Blunier, A. J. Bourne, E. Brook, S. L. Buchardt, C. Buizert, J. Chappellaz, H. B. Clausen, E. Cook, D. Dahl-Jensen, S. M. Davies, M. Guillevic, S. Kipfstuhl, T. Laepple, I. K. Seierstad, J. P. Severinghaus, J. P. Steffensen, C. Stowasser, A. Svensson, P. Vallelonga, B. M. Vinther, F. Wilhelms, and M. Winstrup
Clim. Past, 9, 2713–2730, https://doi.org/10.5194/cp-9-2713-2013, https://doi.org/10.5194/cp-9-2713-2013, 2013
R. Schneider, J. Schmitt, P. Köhler, F. Joos, and H. Fischer
Clim. Past, 9, 2507–2523, https://doi.org/10.5194/cp-9-2507-2013, https://doi.org/10.5194/cp-9-2507-2013, 2013
H. Fischer, J. Severinghaus, E. Brook, E. Wolff, M. Albert, O. Alemany, R. Arthern, C. Bentley, D. Blankenship, J. Chappellaz, T. Creyts, D. Dahl-Jensen, M. Dinn, M. Frezzotti, S. Fujita, H. Gallee, R. Hindmarsh, D. Hudspeth, G. Jugie, K. Kawamura, V. Lipenkov, H. Miller, R. Mulvaney, F. Parrenin, F. Pattyn, C. Ritz, J. Schwander, D. Steinhage, T. van Ommen, and F. Wilhelms
Clim. Past, 9, 2489–2505, https://doi.org/10.5194/cp-9-2489-2013, https://doi.org/10.5194/cp-9-2489-2013, 2013
L. Bazin, A. Landais, B. Lemieux-Dudon, H. Toyé Mahamadou Kele, D. Veres, F. Parrenin, P. Martinerie, C. Ritz, E. Capron, V. Lipenkov, M.-F. Loutre, D. Raynaud, B. Vinther, A. Svensson, S. O. Rasmussen, M. Severi, T. Blunier, M. Leuenberger, H. Fischer, V. Masson-Delmotte, J. Chappellaz, and E. Wolff
Clim. Past, 9, 1715–1731, https://doi.org/10.5194/cp-9-1715-2013, https://doi.org/10.5194/cp-9-1715-2013, 2013
D. Veres, L. Bazin, A. Landais, H. Toyé Mahamadou Kele, B. Lemieux-Dudon, F. Parrenin, P. Martinerie, E. Blayo, T. Blunier, E. Capron, J. Chappellaz, S. O. Rasmussen, M. Severi, A. Svensson, B. Vinther, and E. W. Wolff
Clim. Past, 9, 1733–1748, https://doi.org/10.5194/cp-9-1733-2013, https://doi.org/10.5194/cp-9-1733-2013, 2013
S. Zürcher, R. Spahni, F. Joos, M. Steinacher, and H. Fischer
Biogeosciences, 10, 1963–1981, https://doi.org/10.5194/bg-10-1963-2013, https://doi.org/10.5194/bg-10-1963-2013, 2013
A. Svensson, M. Bigler, T. Blunier, H. B. Clausen, D. Dahl-Jensen, H. Fischer, S. Fujita, K. Goto-Azuma, S. J. Johnsen, K. Kawamura, S. Kipfstuhl, M. Kohno, F. Parrenin, T. Popp, S. O. Rasmussen, J. Schwander, I. Seierstad, M. Severi, J. P. Steffensen, R. Udisti, R. Uemura, P. Vallelonga, B. M. Vinther, A. Wegner, F. Wilhelms, and M. Winstrup
Clim. Past, 9, 749–766, https://doi.org/10.5194/cp-9-749-2013, https://doi.org/10.5194/cp-9-749-2013, 2013
B. Bereiter, T. F. Stocker, and H. Fischer
Atmos. Meas. Tech., 6, 251–262, https://doi.org/10.5194/amt-6-251-2013, https://doi.org/10.5194/amt-6-251-2013, 2013
Related subject area
Subject: Teleconnections | Archive: Ice Cores | Timescale: Millenial/D-O
Disparate energy sources for slow and fast Dansgaard–Oeschger cycles
Bipolar volcanic synchronization of abrupt climate change in Greenland and Antarctic ice cores during the last glacial period
An improved north–south synchronization of ice core records around the 41 kyr 10Be peak
Direct linking of Greenland and Antarctic ice cores at the Toba eruption (74 ka BP)
The last deglaciation: timing the bipolar seesaw
Diederik Liebrand, Anouk T. M. de Bakker, Heather J. H. Johnstone, and Charlotte S. Miller
Clim. Past, 19, 1447–1459, https://doi.org/10.5194/cp-19-1447-2023, https://doi.org/10.5194/cp-19-1447-2023, 2023
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Short summary
Climate cycles with millennial periodicities are enigmatic because no Earth external climate forcing exists that operates on millennial timescales. Using a statistical analysis of a famous Greenlandic air temperature record, we show that two disparate energy sources (one astronomical and one centennial) fuel millennial climate variability. We speculate that two distinct Earth internal cryospheric/climatic/oceanic processes are responsible for the transfer of energy to millennial climate cycles.
Anders Svensson, Dorthe Dahl-Jensen, Jørgen Peder Steffensen, Thomas Blunier, Sune O. Rasmussen, Bo M. Vinther, Paul Vallelonga, Emilie Capron, Vasileios Gkinis, Eliza Cook, Helle Astrid Kjær, Raimund Muscheler, Sepp Kipfstuhl, Frank Wilhelms, Thomas F. Stocker, Hubertus Fischer, Florian Adolphi, Tobias Erhardt, Michael Sigl, Amaelle Landais, Frédéric Parrenin, Christo Buizert, Joseph R. McConnell, Mirko Severi, Robert Mulvaney, and Matthias Bigler
Clim. Past, 16, 1565–1580, https://doi.org/10.5194/cp-16-1565-2020, https://doi.org/10.5194/cp-16-1565-2020, 2020
Short summary
Short summary
We identify signatures of large bipolar volcanic eruptions in Greenland and Antarctic ice cores during the last glacial period, which allows for a precise temporal alignment of the ice cores. Thereby the exact timing of unexplained, abrupt climatic changes occurring during the last glacial period can be determined in a global context. The study thus provides a step towards a full understanding of elements of the climate system that may also play an important role in the future.
Grant M. Raisbeck, Alexandre Cauquoin, Jean Jouzel, Amaelle Landais, Jean-Robert Petit, Vladimir Y. Lipenkov, Juerg Beer, Hans-Arno Synal, Hans Oerter, Sigfus J. Johnsen, Jorgen P. Steffensen, Anders Svensson, and Françoise Yiou
Clim. Past, 13, 217–229, https://doi.org/10.5194/cp-13-217-2017, https://doi.org/10.5194/cp-13-217-2017, 2017
Short summary
Short summary
Using records of a long-lived radioactive nuclide (10Be) that is formed globally in the atmosphere and deposited within a few years to the earth’s surface, we have synchronized three Antarctic ice cores to one from Greenland. This permits the climate and other environmental parameters registered in these ice cores to be put on a common timescale with a precision of a few decades, thus allowing different models and mechanisms associated with these parameters to be tested with the same precision.
A. Svensson, M. Bigler, T. Blunier, H. B. Clausen, D. Dahl-Jensen, H. Fischer, S. Fujita, K. Goto-Azuma, S. J. Johnsen, K. Kawamura, S. Kipfstuhl, M. Kohno, F. Parrenin, T. Popp, S. O. Rasmussen, J. Schwander, I. Seierstad, M. Severi, J. P. Steffensen, R. Udisti, R. Uemura, P. Vallelonga, B. M. Vinther, A. Wegner, F. Wilhelms, and M. Winstrup
Clim. Past, 9, 749–766, https://doi.org/10.5194/cp-9-749-2013, https://doi.org/10.5194/cp-9-749-2013, 2013
J. B. Pedro, T. D. van Ommen, S. O. Rasmussen, V. I. Morgan, J. Chappellaz, A. D. Moy, V. Masson-Delmotte, and M. Delmotte
Clim. Past, 7, 671–683, https://doi.org/10.5194/cp-7-671-2011, https://doi.org/10.5194/cp-7-671-2011, 2011
Cited articles
Adolphi, F. and Muscheler, R.: Synchronizing the Greenland ice core and
radiocarbon timescales over the Holocene – Bayesian wiggle-matching of
cosmogenic radionuclide records, Clim. Past, 12, 15–30,
https://doi.org/10.5194/cp-12-15-2016, 2016.
Adolphi, F., Muscheler, R., Svensson, A., Aldahan, A., Possnert, G., Beer,
J., Sjolte, J., Björck, S., Matthes, K., and Thiéblemont, R.:
Persistent link between solar activity and Greenland climate during the Last
Glacial Maximum, Nat. Geosci., 7, 662–666, https://doi.org/10.1038/ngeo2225, 2014.
Adolphi, F., Muscheler, R., Friedrich, M., Güttler, D., Wacker, L.,
Talamo, S., and Kromer, B.: Radiocarbon calibration uncertainties during the
last deglaciation: Insights from new floating tree-ring chronologies,
Quaternary Sci. Rev., 170, 98–108,
https://doi.org/10.1016/j.quascirev.2017.06.026, 2017.
Andersen, K. K., Azuma, N., Barnola, J. M., Bigler, M., Biscaye, P., Caillon,
N., Chappellaz, J., Clausen, H. B., Dahl-Jensen, D., Fischer, H., Fluckiger,
J., Fritzsche, D., Fujii, Y., Goto-Azuma, K., Gronvold, K., Gundestrup, N.
S., Hansson, M., Huber, C., Hvidberg, C. S., Johnsen, S. J., Jonsell, U.,
Jouzel, J., Kipfstuhl, S., Landais, A., Leuenberger, M., Lorrain, R.,
Masson-Delmotte, V., Miller, H., Motoyama, H., Narita, H., Popp, T.,
Rasmussen, S. O., Raynaud, D., Rothlisberger, R., Ruth, U., Samyn, D.,
Schwander, J., Shoji, H., Siggard-Andersen, M. L., Steffensen, J. P.,
Stocker, T., Sveinbjornsdottir, A. E., Svensson, A., Takata, M., Tison, J.
L., Thorsteinsson, T., Watanabe, O., Wilhelms, F., White, J. W., and North
Greenland Ice Core Project, m.: High-resolution record of Northern Hemisphere
climate extending into the last interglacial period, Nature, 431, 147–151,
https://doi.org/10.1038/nature02805, 2004.
Andersen, K. K., Svensson, A., Johnsen, S. J., Rasmussen, S. O., Bigler, M.,
Röthlisberger, R., Ruth, U., Siggaard-Andersen, M.-L., Peder Steffensen,
J., and Dahl-Jensen, D.: The Greenland Ice Core Chronology 2005, 15–42 ka.
Part 1: constructing the time scale, Quaternary Sci. Rev., 25, 3246–3257,
https://doi.org/10.1016/j.quascirev.2006.08.002, 2006.
Bard, E., Raisbeck, G. M., Yiou, F., and Jouzel, J.: Solar modulation of
cosmogenic nuclide production over the last millennium: comparison between
14C and 10Be records, Earth Planet. Sc. Lett., 150,
453–462, https://doi.org/10.1016/s0012-821x(97)00082-4, 1997.
Bard, E., Arnold, M., Hamelin, B., Tisnerat-Laborde, N., and Cabioch, G.:
Radiocarbon Calibration by Means of Mass Spectrometric
230Th∕234U and 14C Ages of Corals: An Updated Database
Including Samples from Barbados, Mururoa and Tahiti, Radiocarbon, 40,
1085–1092, https://doi.org/10.1017/S0033822200019135, 1998.
Bard, E., Ménot, G., Rostek, F., Licari, L., Böning, P., Edwards, R.
L., Cheng, H., Wang, Y., and Heaton, T. J.: Radiocarbon
calibration/comparison records based on marine sediments from the Pakistan
and Iberian margins, Radiocarbon, 55, 1999–2019, 2013.
Baumgartner, M., Kindler, P., Eicher, O., Floch, G., Schilt, A., Schwander,
J., Spahni, R., Capron, E., Chappellaz, J., Leuenberger, M., Fischer, H., and
Stocker, T. F.: NGRIP CH4 concentration from 120 to 10 kyr before
present and its relation to a δ15N temperature
reconstruction from the same ice core, Clim. Past, 10, 903–920,
https://doi.org/10.5194/cp-10-903-2014, 2014.
Baumgartner, S., Beer, J., Suter, M., Dittrich-Hannen, B., Synal, H. A.,
Kubik, P. W., Hammer, C., and Johnsen, S.: Chlorine 36 fallout in the Summit
Greenland Ice Core Project ice core, J. Geophys. Res.-Oceans, 102,
26659–26662, https://doi.org/10.1029/97JC00166, 1997a.
Baumgartner, S., Beer, J., Wagner, G., Kubik, P., Suter, M., Raisbeck, G. M.,
and Yiou, F.: 10Be and dust, Nucl. Instrum. Meth. B, 123, 296–301,
https://doi.org/10.1016/s0168-583x(96)00751-3, 1997b.
Baumgartner, S., Beer, J., Masarik, J., Wagner, G., Meynadier, L., and Synal,
H.-A.: Geomagnetic Modulation of the 36Cl Flux in the GRIP Ice
Core, Greenland, Science, 279, 1330–1332, https://doi.org/10.1126/science.279.5355.1330,
1998.
Bigler, M.: Hochauflösende Spurenstoffmessungen an polaren
Eisbohrkernen: Glazio-chemische und klimatische Prozessstudien, PhD,
Environmental Physics, University of Bern, Bern, 2004.
Bjorck, S., Kromer, B., Johnsen, S., Bennike, O., Hammarlund, D., Lemdahl,
G., Possnert, G., Rasmussen, T. L., Wohlfarth, B., Hammer, C. U., and Spurk,
M.: Synchronized TerrestrialAtmospheric Deglacial Records Around the North
Atlantic, Science, 274, 1155–1160, https://doi.org/10.1126/science.274.5290.1155, 1996.
Bourne, A. J., Davies, S. M., Abbott, P. M., Rasmussen, S. O., Steffensen, J.
P., and Svensson, A.: Revisiting the Faroe Marine Ash Zone III in two
Greenland ice cores: implications for marine-ice correlations, J. Quaternary
Sci., 28, 641–646, https://doi.org/10.1002/jqs.2663, 2013.
Broecker, W. S.: A preliminary evaluation of uranium series inequilibrium as
a tool for absolute age measurement on marine carbonates, J. Geophys. Res.,
68, 2817–2834, https://doi.org/10.1029/JZ068i009p02817, 1963.
Bronk Ramsey, C., van der Plicht, J., and Weninger, B.: “Wiggle matching”
radiocarbon dates, Radiocarbon, 43, 381–390, 2001.
Bronk Ramsey, C., Staff, R. A., Bryant, C. L., Brock, F., Kitagawa, H., van
der Plicht, J., Schlolaut, G., Marshall, M. H., Brauer, A., Lamb, H. F.,
Payne, R. L., Tarasov, P. E., Haraguchi, T., Gotanda, K., Yonenobu, H.,
Yokoyama, Y., Tada, R., and Nakagawa, T.: A complete terrestrial radiocarbon
record for 11.2 to 52.8 kyr B.P, Science, 338, 370–374,
https://doi.org/10.1126/science.1226660, 2012.
Bronk Ramsey, C., Albert, P., Blockley, S., Hardiman, M., Lane, C., Macleod,
A., Matthews, I. P., Muscheler, R., Palmer, A., and Staff, R. A.: Integrating
timescales with time-transfer functions: a practical approach for an INTIMATE
database, Quaternary Sci. Rev., 106, 67–80,
https://doi.org/10.1016/j.quascirev.2014.05.028, 2014.
Buizert, C., Adrian, B., Ahn, J., Albert, M., Alley, R. B., Baggenstos, D.,
Bauska, T. K., Bay, R. C., Bencivengo, B. B., Bentley, C. R., Brook, E. J.,
Chellman, N. J., Clow, G. D., Cole-Dai, J., Conway, H., Cravens, E., Cuffey,
K. M., Dunbar, N. W., Edwards, J. S., Fegyveresi, J. M., Ferris, D. G.,
Fitzpatrick, J. J., Fudge, T. J., Gibson, C. J., Gkinis, V., Goetz, J. J.,
Gregory, S., Hargreaves, G. M., Iverson, N., Johnson, J. A., Jones, T. R.,
Kalk, M. L., Kippenhan, M. J., Koffman, B. G., Kreutz, K., Kuhl, T. W.,
Lebar, D. A., Lee, J. E., Marcott, S. A., Markle, B. R., Maselli, O. J.,
McConnell, J. R., McGwire, K. C., Mitchell, L. E., Mortensen, N. B., Neff, P.
D., Nishiizumi, K., Nunn, R. M., Orsi, A. J., Pasteris, D. R., Pedro, J. B.,
Pettit, E. C., Price, P. B., Priscu, J. C., Rhodes, R. H., Rosen, J. L.,
Schauer, A. J., Schoenemann, S. W., Sendelbach, P. J., Severinghaus, J. P.,
Shturmakov, A. J., Sigl, M., Slawny, K. R., Souney, J. M., Sowers, T. A.,
Spencer, M. K., Steig, E. J., Taylor, K. C., Twickler, M. S., Vaughn, B. H.,
Voigt, D. E., Waddington, E. D., Welten, K. C., Wendricks, A. W., White, J.
W. C., Winstrup, M., Wong, G. J., and Woodruff, T. E.: Precise interpolar
phasing of abrupt climate change during the last ice age, Nature, 520,
661–665, https://doi.org/10.1038/nature14401, 2015.
Cauquoin, A., Raisbeck, G. M., Jouzel, J., and Paillard, D.: Use of
10Be to Predict Atmospheric 14C Variations during the
Laschamp Excursion: High Sensitivity to Cosmogenic Isotope Production
Calculations, Radiocarbon, 56, 67–82, https://doi.org/10.2458/56.16478, 2014.
Cheng, H., Lawrence Edwards, R., Shen, C.-C., Polyak, V. J., Asmerom, Y.,
Woodhead, J., Hellstrom, J., Wang, Y., Kong, X., Spötl, C., Wang, X., and
Calvin Alexander Jr., E.: Improvements in 230Th dating,
230Th and 234U half-life values, and U–Th isotopic
measurements by multi-collector inductively coupled plasma mass spectrometry,
Earth Planet. Sc. Lett., 371–372, 82–91,
https://doi.org/10.1016/j.epsl.2013.04.006, 2013a.
Cheng, H., Sinha, A., Cruz, F. W., Wang, X., Edwards, R. L., d'Horta, F. M.,
Ribas, C. C., Vuille, M., Stott, L. D., and Auler, A. S.: Climate change
patterns in Amazonia and biodiversity, Nat. Commun., 4, 1411,
https://doi.org/10.1038/ncomms2415, 2013b.
Cheng, H., Edwards, R. L., Sinha, A., Spötl, C., Yi, L., Chen, S., Kelly,
M., Kathayat, G., Wang, X., Li, X., Kong, X., Wang, Y., Ning, Y., and Zhang,
H.: The Asian monsoon over the past 640,000 years and ice age terminations,
Nature, 534, 640–646, https://doi.org/10.1038/nature18591, 2016.
Craig, H.: The Natural Distribution of Radiocarbon and the Exchange Time of
Carbon Dioxide Between Atmosphere and Sea, Tellus, 9, 1–17,
https://doi.org/10.1111/j.2153-3490.1957.tb01848.x, 1957.
Cutler, K., Gray, S., Burr, G., Edwards, R., Taylor, F., Cabioch, G., Beck,
J., Cheng, H., and Moore, J.: Radiocarbon calibration and comparison to
50 kyr BP with paired 14C and 230Th dating of corals
from Vanuatu and Papua New Guinea, Radiocarbon, 46, 1127–1160, 2004.
Dansgaard, W.: Stable isotopes in precipitation, Tellus, 16, 436–468,
https://doi.org/10.1111/j.2153-3490.1964.tb00181.x, 1964.
Dansgaard, W. and Johnsen, S. J.: A Flow Model and a Time Scale for the Ice
Core from Camp Century, Greenland, J. Glaciol., 8, 215–223,
https://doi.org/10.3189/S0022143000031208, 1969.
Dansgaard, W., Johnsen, S. J., Møller, J., and Langway, C. C.: One
Thousand Centuries of Climatic Record from Camp Century on the Greenland Ice
Sheet, Science, 166, 377–380, https://doi.org/10.1126/science.166.3903.377, 1969.
Dansgaard, W., Johnsen, S. J., Clausen, H. B., Dahl-Jensen, D., Gundestrup,
N. S., Hammer, C. U., Hvidberg, C. S., Steffensen, J. P.,
Sveinbjörnsdottir, A. E., Jouzel, J., and Bond, G.: Evidence for general
instability of past climate from a 250-kyr ice-core record, Nature, 364,
218–220, https://doi.org/10.1038/364218a0, 1993.
Delmas, R. J., Beer, J., Synal, H.-A., Muscheler, R., Petit, J.-R., and
Pourchet, M.: Bomb-test 36Cl measurements in Vostok snow (Antarctica) and the
use of 36Cl as a dating tool for deep ice cores, Tellus B, 56,
492–498, https://doi.org/10.1111/j.1600-0889.2004.00109.x, 2004.
Denton, G., Alley, R., Comer, G., and Broecker, W.: The role of seasonality
in abrupt climate change, Quaternary Sci. Rev., 24, 1159–1182,
https://doi.org/10.1016/j.quascirev.2004.12.002, 2005.
Durand, N., Deschamps, P., Bard, E., Hamelin, B., Camoin, G., Thomas, A. L.,
Henderson, G. M., Yokoyama, Y., and Matsuzaki, H.: Comparison of
14C and U-Th Ages in Corals from IODP #310 Cores Offshore
Tahiti, Radiocarbon, 55, 1947–1974, https://doi.org/10.2458/azu_js_rc.v55i2.16134,
2013.
Dykoski, C. A., Edwards, R. L., Cheng, H., Yuan, D., Cai, Y., Zhang, M., Lin,
Y., Qing, J., An, Z., and Revenaugh, J.: A high-resolution, absolute-dated
Holocene and deglacial Asian monsoon record from Dongge Cave, China, Earth
Planet. Sc. Lett., 233, 71–86, https://doi.org/10.1016/j.epsl.2005.01.036,
2005.
Edwards, L. R., Chen, J. H., Ku, T.-L., and Wasserburg, G. J.: Precise Timing
of the Last Interglacial Period from Mass Spectrometric Determination of
Thorium-230 in Corals, Science, 236, 1547–1553,
https://doi.org/10.1126/science.236.4808.1547, 1987.
Erhardt, T., Capron, E., Rasmussen, S. O., Schüpbach, S., Bigler, M., and
Fischer, H.: Decadal-scale progression of Dansgaard-Oeschger warming events,
in preparation, 2018.
Efron, B.: Bootstrap methods: another look at the jackknife, Ann. Stat., 7,
1–26, 1979.
Eggleston, S., Schmitt, J., Bereiter, B., Schneider, R., and Fischer, H.:
Evolution of the stable carbon isotope composition of atmospheric CO2
over the last glacial cycle, Paleoceanography, 31, 434–452,
https://doi.org/10.1002/2015PA002874, 2016.
Fairbanks, R. G., Mortlock, R. A., Chiu, T.-C., Cao, L., Kaplan, A.,
Guilderson, T. P., Fairbanks, T. W., Bloom, A. L., Grootes, P. M., and
Nadeau, M.-J.: Radiocarbon calibration curve spanning 0 to 50,000 years BP
based on paired 230Th/234U∕238U and 14C
dates on pristine corals, Quaternary Sci. Rev., 24, 1781–1796,
https://doi.org/10.1016/j.quascirev.2005.04.007, 2005.
Fedele, F. G., Giaccio, B., Isaia, R., Orsi, G., Carroll, M., and Scaillet,
B.: The Campanian Ignimbrite factor: towards a reappraisal of the Middle to
Upper Palaeolithic “transition”, in: Living under the shadow: cultural
impacts of volcanic eruptions, edited by: Grattan, J. and Torrence, R., Left
Coast Press, New York, USA, 19–41, 2007.
Field, C. V., Schmidt, G. A., Koch, D., and Salyk, C.: Modeling production
and climate-related impacts on10Be concentration in ice cores, J.
Geophys. Res., 111, D15107, https://doi.org/10.1029/2005jd006410, 2006.
Finkel, R. C. and Nishiizumi, K.: Beryllium 10 concentrations in the
Greenland Ice Sheet Project 2 ice core from 3–40 ka, J. Geophys. Res., 102,
26699, https://doi.org/10.1029/97jc01282, 1997.
Fleitmann, D., Cheng, H., Badertscher, S., Edwards, R. L., Mudelsee, M.,
Göktürk, O. M., Fankhauser, A., Pickering, R., Raible, C. C., Matter,
A., Kramers, J., and Tüysüz, O.: Timing and climatic impact of
Greenland interstadials recorded in stalagmites from northern Turkey,
Geophys. Res. Lett., 36, L19707, https://doi.org/10.1029/2009GL040050, 2009.
Fohlmeister, J., Kromer, B., and Mangini, A.: The Influence of Soil Organic
Matter Age Spectrum on the Reconstruction of Atmospheric 14C Levels
Via Stalagmites, Radiocarbon, 53, 99–115, https://doi.org/10.1017/S003382220003438X,
2011.
Genty, D. and Massault, M.: Carbon transfer dynamics from bomb-14C
and δ13C time series of a laminated stalagmite from SW
France–modelling and comparison with other stalagmite records, Geochim.
Cosmochim. Ac., 63, 1537–1548,
https://doi.org/10.1016/S0016-7037(99)00122-2, 1999.
Genty, D., Baker, A., Massault, M., Proctor, C., Gilmour, M., Pons-Branchu,
E., and Hamelin, B.: Dead carbon in stalagmites: carbonate bedrock
paleodissolution vs. ageing of soil organic matter. Implications for 13C
variations in speleothems, Geochim. Cosmochim. Ac., 65, 3443–3457,
https://doi.org/10.1016/S0016-7037(01)00697-4, 2001.
Giaccio, B., Hajdas, I., Isaia, R., Deino, A., and Nomade, S.: High-precision
14C and 40Ar∕39Ar dating of the Campanian Ignimbrite
(Y-5) reconciles the time-scales of climatic-cultural processes at 40 ka,
Sci. Rep., 7, 45940, https://doi.org/10.1038/srep45940, 2017.
Gkinis, V., Simonsen, S. B., Buchardt, S. L., White, J. W. C., and Vinther,
B. M.: Water isotope diffusion rates from the NorthGRIP ice core for the last
16,000 years – Glaciological and paleoclimatic implications, Earth Planet.
Sc. Lett., 405, 132–141, https://doi.org/10.1016/j.epsl.2014.08.022, 2014.
Guillevic, M., Bazin, L., Landais, A., Kindler, P., Orsi, A.,
Masson-Delmotte, V., Blunier, T., Buchardt, S. L., Capron, E., Leuenberger,
M., Martinerie, P., Prié, F., and Vinther, B. M.: Spatial gradients of
temperature, accumulation and δ18O-ice in Greenland over a
series of Dansgaard–Oeschger events, Clim. Past, 9, 1029–1051,
https://doi.org/10.5194/cp-9-1029-2013, 2013.
He, F.: Simulating transient climate evolution of the last deglaciation with
CCSM 3, PhD, Atmospheric and Ocean Sciences, University of Wisconsin-Madison,
185 pp., 2011.
Heikkilä, U., Beer, J., and Feichter, J.: Meridional transport and
deposition of atmospheric 10Be, Atmos. Chem. Phys., 9, 515–527,
https://doi.org/10.5194/acp-9-515-2009, 2009a.
Heikkilä, U., Beer, J., Feichter, J., Alfimov, V., Synal, H.-A.,
Schotterer, U., Eichler, A., Schwikowski, M., and Thompson, L.:
36Cl bomb peak: comparison of modeled and measured data, Atmos.
Chem. Phys., 9, 4145–4156, https://doi.org/10.5194/acp-9-4145-2009, 2009b.
Heikkilä, U., Beer, J., Abreu, J. A., and Steinhilber, F.: On the
Atmospheric Transport and Deposition of the Cosmogenic Radionuclides
(10Be): A Review, Space Sci. Rev., 176, 321–332,
https://doi.org/10.1007/s11214-011-9838-0, 2011.
Heikkilä, U. and Smith, A. M.: Production rate and climate influences on
the variability of 10Be deposition simulated by ECHAM5-HAM:
Globally, in Greenland, and in Antarctica, J. Geophys. Res.-Atmos, 118,
2506–2520, https://doi.org/10.1002/jgrd.50217, 2013.
Henry, L. G., McManus, J. F., Curry, W. B., Roberts, N. L., Piotrowski, A.
M., and Keigwin, L. D.: North Atlantic ocean circulation and abrupt climate
change during the last glaciation, Science, 353, 470–474,
https://doi.org/10.1126/science.aaf5529, 2016.
Herbst, K., Muscheler, R., and Heber, B.: The new local interstellar spectra
and their influence on the production rates of the cosmogenic radionuclides
10Be and 14C, J. Geophys. Res., 122, 23–34,
https://doi.org/10.1002/2016JA023207, 2016.
Hoffmann, D. L., Beck, J. W., Richards, D. A., Smart, P. L., Singarayer, J.
S., Ketchmark, T., and Hawkesworth, C. J.: Towards radiocarbon calibration
beyond 28 ka using speleothems from the Bahamas, Earth Planet. Sc. Lett.,
289, 1–10, https://doi.org/10.1016/j.epsl.2009.10.004, 2010.
Hogg, A., Southon, J., Turney, C., Palmer, J., Ramsey, C. B., Fenwick, P.,
Boswijk, G., Büntgen, U., Friedrich, M., Helle, G., Hughen, K., Jones,
R., Kromer, B., Noronha, A., Reinig, F., Reynard, L., Staff, R., and Wacker,
L.: Decadally Resolved Lateglacial Radiocarbon Evidence from New Zealand
Kauri, Radiocarbon, 58, 709–733, https://doi.org/10.1017/RDC.2016.86, 2016.
Hughen, K., Southon, J., Lehman, S., Bertrand, C., and Turnbull, J.:
Marine-derived 14C calibration and activity record for the past
50,000 years updated from the Cariaco Basin, Quaternary Sci. Rev., 25,
3216–3227, https://doi.org/10.1016/j.quascirev.2006.03.014, 2006.
Johnsen, S. J., Dahl-Jensen, D., Dansgaard, W., and Gundestrup, N.: Greenland
palaeotemperatures derived from GRIP bore hole temperature and ice core
isotope profiles, Tellus B, 47, 624–629,
https://doi.org/10.1034/j.1600-0889.47.issue5.9.x, 1995.
Johnsen, S. J., Dahl-Jensen, D., Gundestrup, N., Steffensen, J. P., Clausen,
H. B., Miller, H., Masson-Delmotte, V., Sveinbjörnsdottir, A. E., and
White, J.: Oxygen isotope and palaeotemperature records from six Greenland
ice-core stations: Camp Century, Dye-3, GRIP, GISP2, Renland and NorthGRIP,
J. Quaternary Sci., 16, 299–307, https://doi.org/10.1002/jqs.622, 2001.
Kanner, L. C., Burns, S. J., Cheng, H., and Edwards, R. L.: High-Latitude
Forcing of the South American Summer Monsoon During the Last Glacial,
Science, 335, 570–573, https://doi.org/10.1126/science.1213397, 2012.
Köhler, P., Muscheler, R., and Fischer, H.: A model-based interpretation
of low-frequency changes in the carbon cycle during the last 120,000 years
and its implications for the reconstruction of atmospheric Δ14C, Geochem. Geophy. Geosy., 7, Q11N06, https://doi.org/10.1029/2005GC001228,
2006.
Laj, C., Kissel, C., Mazaud, A., Channell, J. E. T., and Beer, J.: North
Atlantic palaeointensity stack since 75 ka (NAPIS-75) and the duration of
the Laschamp event, Philos. T. Roy Soc. A, 358, 1009–1025,
https://doi.org/10.1098/rsta.2000.0571, 2000.
Laj, C., Kissel, C., and Beer, J.: High Resolution Global Paleointensity
Stack Since 75 kyr (GLOPIS-75) Calibrated to Absolute Values, in: Timescales
Of The Paleomagnetic Field, American Geophysical Union, 255–265, 2004.
Laj, C., Guillou, H., and Kissel, C.: Dynamics of the earth magnetic field in
the 10–75 kyr period comprising the Laschamp and Mono Lake excursions: New
results from the French Chaîne des Puys in a global perspective, Earth
Planet. Sc. Lett., 387, 184–197, https://doi.org/10.1016/j.epsl.2013.11.031,
2014.
Lal, D. and Peters, B.: Cosmic Ray Produced Radioactivity on the Earth, in:
Kosmische Strahlung II/Cosmic Rays II, edited by: Sitte, K., Handbuch der
Physik/Encyclopedia of Physics, Springer Berlin Heidelberg, Berlin
Heidelberg, Germany, 551–612, 1967.
Lane, C. S., Brauer, A., Blockley, S. P. E., and Dulski, P.: Volcanic ash
reveals time-transgressive abrupt climate change during the Younger Dryas,
Geology, 41, 1251–1254, https://doi.org/10.1130/g34867.1, 2013.
Lascu, I., Feinberg, J. M., Dorale, J. A., Cheng, H., and Edwards, R. L.: Age
of the Laschamp excursion determined by U-Th dating of a speleothem
geomagnetic record from North America, Geology, 44, 139–142,
https://doi.org/10.1130/g37490.1, 2016.
Li, T.-Y., Han, L.-Y., Cheng, H., Edwards, R. L., Shen, C.-C., Li, H.-C., Li,
J.-Y., Huang, C.-X., Zhang, T.-T., and Zhao, X.: Evolution of the Asian
summer monsoon during Dansgaard/Oeschger events 13–17 recorded in a
stalagmite constrained by high-precision chronology from southwest China,
Quaternary Res., 88, 121–128, https://doi.org/10.1017/qua.2017.22, 2017.
Lougheed, B. C., Filipsson, H. L., and Snowball, I.: Large spatial variations
in coastal 14C reservoir age – a case study from the Baltic Sea,
Clim. Past, 9, 1015–1028, https://doi.org/10.5194/cp-9-1015-2013, 2013.
Lukasczyk, C. E.: 36Chlor in Grönlandeis, PhD, ETH Zurich, Zurich,
Switzerland, 285 pp., 1994.
Markle, B. R., Steig, E. J., Buizert, C., Schoenemann, S. W., Bitz, C. M.,
Fudge, T. J., Pedro, J. B., Ding, Q., Jones, T. R., White, J. W. C., and
Sowers, T.: Global atmospheric teleconnections during Dansgaard-Oeschger
events, Nat. Geosci., 10, 36–40, https://doi.org/10.1038/ngeo2848, 2016.
Masarik, J. and Beer, J.: Simulation of particle fluxes and cosmogenic
nuclide production in the Earth's atmosphere, J. Geophys. Res.-Atmos, 104,
12099–12111, https://doi.org/10.1029/1998jd200091, 1999.
Masarik, J. and Beer, J.: An updated simulation of particle fluxes and
cosmogenic nuclide production in the Earth's atmosphere, J. Geophys. Res.,
114, D11103, https://doi.org/10.1029/2008jd010557, 2009.
Merz, N., Raible, C. C., Fischer, H., Varma, V., Prange, M., and Stocker, T.
F.: Greenland accumulation and its connection to the large-scale atmospheric
circulation in ERA-Interim and paleoclimate simulations, Clim. Past, 9,
2433–2450, https://doi.org/10.5194/cp-9-2433-2013, 2013.
Muscheler, R. and Heikkilä, U.: Constraints on long-term changes in solar
activity from the range of variability of cosmogenic radionuclide records,
Astrophysics and Space Sciences Transactions, 7, 355–364,
https://doi.org/10.5194/astra-7-355-2011, 2011.
Muscheler, R., Beer, J., Wagner, G., Laj, C., Kissel, C., Raisbeck, G. M.,
Yiou, F., and Kubik, P. W.: Changes in the carbon cycle during the last
deglaciation as indicated by the comparison of 10Be and
14C records, Earth Planet. Sc. Lett., 219, 325–340,
https://doi.org/10.1016/s0012-821x(03)00722-2, 2004.
Muscheler, R., Beer, J., Kubik, P. W., and Synal, H. A.: Geomagnetic field
intensity during the last 60,000 years based on 10Be and
36Cl from the Summit ice cores and 14C, Quaternary Sci.
Rev., 24, 1849–1860, https://doi.org/10.1016/j.quascirev.2005.01.012, 2005.
Muscheler, R., Kromer, B., Björck, S., Svensson, A., Friedrich, M.,
Kaiser, K. F., and Southon, J.: Tree rings and ice cores reveal 14C
calibration uncertainties during the Younger Dryas, Nat. Geosci., 1,
263–267, https://doi.org/10.1038/ngeo128, 2008.
Muscheler, R., Adolphi, F., and Knudsen, M. F.: Assessing the differences
between the IntCal and Greenland ice-core time scales for the last 14,000
years via the common cosmogenic radionuclide variations, Quaternary Sci.
Rev., 106, 81–87, https://doi.org/10.1016/j.quascirev.2014.08.017, 2014a.
Muscheler, R., Adolphi, F., and Svensson, A.: Challenges in 14C
dating towards the limit of the method inferred from anchoring a floating
tree ring radiocarbon chronology to ice core records around the Laschamp
geomagnetic field minimum, Earth Planet. Sc. Lett., 394, 209–215,
https://doi.org/10.1016/j.epsl.2014.03.024, 2014b.
Nakagawa, T., Kitagawa, H., Yasuda, Y., Tarasov, P. E., Nishida, K., Gotanda,
K., and Sawai, Y.: Asynchronous Climate Changes in the North Atlantic and
Japan During the Last Termination, Science, 299, 688–691,
https://doi.org/10.1126/science.1078235, 2003.
Novello, V. F., Cruz, F. W., Vuille, M., Stríkis, N. M., Edwards, R. L.,
Cheng, H., Emerick, S., de Paula, M. S., Li, X., Barreto, E. d. S., Karmann,
I., and Santos, R. V.: A high-resolution history of the South American
Monsoon from Last Glacial Maximum to the Holocene, Sci. Rep., 7, 44267,
https://doi.org/10.1038/srep44267, 2017.
Nowaczyk, N. R., Frank, U., Kind, J., and Arz, H. W.: A high-resolution
paleointensity stack of the past 14 to 68 ka from Black Sea sediments, Earth
Planet. Sc. Lett., 384, 1–16, https://doi.org/10.1016/j.epsl.2013.09.028,
2013.
Pedro, J. B., Heikkilä, U. E., Klekociuk, A., Smith, A. M., van Ommen, T.
D., and Curran, M. A. J.: Beryllium-10 transport to Antarctica: Results from
seasonally resolved observations and modeling, J. Geophys. Res.-Atmos, 116,
D23120,
https://doi.org/10.1029/2011jd016530, 2011.
Pedro, J. B., McConnell, J. R., van Ommen, T. D., Fink, D., Curran, M. A. J.,
Smith, A. M., Simon, K. J., Moy, A. D., and Das, S. B.: Solar and climate
influences on ice core 10Be records from Antarctica and Greenland
during the neutron monitor era, Earth Planet. Sc. Lett., 355–356, 174–186,
https://doi.org/10.1016/j.epsl.2012.08.038, 2012.
Poluianov, S. V., Kovaltsov, G. A., Mishev, A. L., and Usoskin, I. G.:
Production of cosmogenic isotopes 7Be, 10Be,
14C, 22Na, and 36Cl in the atmosphere:
Altitudinal profiles of yield functions, J. Geophys. Res.-Atmos, 121,
8125–8136, https://doi.org/10.1002/2016JD025034, 2016.
Raisbeck, G. M., Yiou, F., Fruneau, M., Loiseaux, J. M., Lieuvin, M., and
Ravel, J. C.: Cosmogenic 10Be∕7Be as a probe of atmospheric
transport processes, Geophys. Res. Lett., 8, 1015–1018,
https://doi.org/10.1029/GL008i009p01015, 1981.
Raisbeck, G. M., Yiou, F., Jouzel, J., and Stocker, T. F.: Direct north-south
synchronization of abrupt climate change record in ice cores using Beryllium
10, Clim. Past, 3, 541–547, https://doi.org/10.5194/cp-3-541-2007, 2007.
Raisbeck, G. M., Cauquoin, A., Jouzel, J., Landais, A., Petit, J.-R.,
Lipenkov, V. Y., Beer, J., Synal, H.-A., Oerter, H., Johnsen, S. J.,
Steffensen, J. P., Svensson, A., and Yiou, F.: An improved north-south
synchronization of ice core records around the 41 kyr 10Be peak,
Clim. Past, 13, 217–229, https://doi.org/10.5194/cp-13-217-2017, 2017.
Rasmussen, S. O., Andersen, K. K., Svensson, A. M., Steffensen, J. P.,
Vinther, B. M., Clausen, H. B., Siggaard-Andersen, M. L., Johnsen, S. J.,
Larsen, L. B., Dahl-Jensen, D., Bigler, M., Röthlisberger, R., Fischer,
H., Goto-Azuma, K., Hansson, M. E., and Ruth, U.: A new Greenland ice core
chronology for the last glacial termination, J. Geophys. Res., 111, D06102,
https://doi.org/10.1029/2005jd006079, 2006.
Rasmussen, S. O., Seierstad, I. K., Andersen, K. K., Bigler, M., Dahl-Jensen,
D., and Johnsen, S. J.: Synchronization of the NGRIP, GRIP, and GISP2 ice
cores across MIS 2 and palaeoclimatic implications, Quaternary Sci. Rev., 27,
18–28, https://doi.org/10.1016/j.quascirev.2007.01.016, 2008.
Rasmussen, S. O., Abbott, P. M., Blunier, T., Bourne, A. J., Brook, E.,
Buchardt, S. L., Buizert, C., Chappellaz, J., Clausen, H. B., Cook, E.,
Dahl-Jensen, D., Davies, S. M., Guillevic, M., Kipfstuhl, S., Laepple, T.,
Seierstad, I. K., Severinghaus, J. P., Steffensen, J. P., Stowasser, C.,
Svensson, A., Vallelonga, P., Vinther, B. M., Wilhelms, F., and Winstrup, M.:
A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice
core, Clim. Past, 9, 2713–2730, https://doi.org/10.5194/cp-9-2713-2013,
2013.
Rasmussen, S. O., Bigler, M., Blockley, S. P., Blunier, T., Buchardt, S. L.,
Clausen, H. B., Cvijanovic, I., Dahl-Jensen, D., Johnsen, S. J., Fischer, H.,
Gkinis, V., Guillevic, M., Hoek, W. Z., Lowe, J. J., Pedro, J. B., Popp, T.,
Seierstad, I. K., Steffensen, J. P., Svensson, A. M., Vallelonga, P.,
Vinther, B. M., Walker, M. J. C., Wheatley, J. J., and Winstrup, M.: A
stratigraphic framework for abrupt climatic changes during the Last Glacial
period based on three synchronized Greenland ice-core records: refining and
extending the INTIMATE event stratigraphy, Quaternary Sci. Rev., 106, 14–28,
https://doi.org/10.1016/j.quascirev.2014.09.007, 2014a.
Rasmussen, S. O., Birks, H. H., Blockley, S. P. E., Brauer, A., Hajdas, I.,
Hoek, W. Z., Lowe, J. J., Moreno, A., Renssen, H., Roche, D. M., Svensson, A.
M., Valdes, P., and Walker, M. J. C.: Dating, synthesis, and interpretation
of palaeoclimatic records of the Last Glacial cycle and model-data
integration: advances by the INTIMATE (INTegration of Ice-core, MArine and
TErrestrial records) COST Action ES0907, Quaternary Sci. Rev., 106, 1–13,
https://doi.org/10.1016/j.quascirev.2014.10.031, 2014b.
Reimer, P. J., Bard, E., Bayliss, A., Beck, J. W., Blackwell, P. G., Bronk
Ramsey, C., Buck, C. E., Cheng, H., Edwards, R. L., Friedrich, M., Grootes,
P. M., Guilderson, T. P., Haflidason, H., Hajdas, I., Hatté, C., Heaton,
T. J., Hoffmann, D. L., Hogg, A. G., Hughen, K. A., Kaiser, K. F., Kromer,
B., Manning, S. W., Niu, M., Reimer, R. W., Richards, D. A., Scott, E. M.,
Southon, J. R., Staff, R. A., Turney, C. S. M., and van der Plicht, J.:
IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50,000
Years cal BP, Radiocarbon, 55, 1869–1887,
https://doi.org/10.2458/azu_js_rc.55.16947, 2013.
Roth, R. and Joos, F.: A reconstruction of radiocarbon production and total
solar irradiance from the Holocene 14C and CO2 records:
implications of data and model uncertainties, Clim. Past, 9, 1879–1909,
https://doi.org/10.5194/cp-9-1879-2013, 2013.
Schneider, T., Bischoff, T., and Haug, G. H.: Migrations and dynamics of the
intertropical convergence zone, Nature, 513, 45–53, https://doi.org/10.1038/nature13636,
2014.
Schüpbach, S., Fischer, H., Bigler, M., Erhardt, T., Gfeller, G.,
Leuenberger, D., Mini, O., Mulvaney, R., Abram, N. J., Fleet, L., Frey, M.
M., Thomas, E., Svensson, A., Dahl-Jensen, D., Kettner, E., Kjaer, H.,
Seierstad, I., Steffensen, J. P., Rasmussen, S. O., Vallelonga, P., Winstrup,
M., Wegner, A., Twarloh, B., Wolff, K., Schmidt, K., Goto-Azuma, K.,
Kuramoto, T., Hirabayashi, M., Uetake, J., Zheng, J., Bourgeois, J., Fisher,
D., Zhiheng, D., Xiao, C., Legrand, M., Spolaor, A., Gabrieli, J., Barbante,
C., Kang, J. H., Hur, S. D., Hong, S. B., Hwang, H. J., Hong, S., Hansson,
M., Iizuka, Y., Oyabu, I., Muscheler, R., Adolphi, F., Maselli, O.,
McConnell, J., and Wolff, E. W.: Greenland records of aerosol source and
atmospheric lifetime changes from the Eemian to the Holocene, Nat. Commun.,
9, 1476, https://doi.org/10.1038/s41467-018-03924-3, 2018.
Seierstad, I. K., Abbott, P. M., Bigler, M., Blunier, T., Bourne, A. J.,
Brook, E., Buchardt, S. L., Buizert, C., Clausen, H. B., Cook, E.,
Dahl-Jensen, D., Davies, S. M., Guillevic, M., Johnsen, S. J., Pedersen, D.
S., Popp, T. J., Rasmussen, S. O., Severinghaus, J. P., Svensson, A., and
Vinther, B. M.: Consistently dated records from the Greenland GRIP, GISP2 and
NGRIP ice cores for the past 104 ka reveal regional millennial-scale δ18O gradients with possible Heinrich event imprint, Quaternary
Sci. Rev., 106, 29–46, https://doi.org/10.1016/j.quascirev.2014.10.032,
2014.
Siegenthaler, U., Heimann, M., and Oeschger, H.: 14C variations
caused by changes in the global carbon cycle, Radiocarbon, 22, 177–191,
1980.
Singer, B. S., Guillou, H., Jicha, B. R., Laj, C., Kissel, C., Beard, B. L.,
and Johnson, C. M.: 40Ar∕39Ar, K–Ar and
230Th–238U dating of the Laschamp excursion: A
radioisotopic tie-point for ice core and climate chronologies, Earth Planet.
Sc. Lett., 286, 80–88, https://doi.org/10.1016/j.epsl.2009.06.030, 2009.
Southon, J.: A First Step to Reconciling the GRIP and GISP2 Ice-Core
Chronologies, 0–14,500 yr B.P, Quaternary Res., 57, 32–37,
https://doi.org/10.1006/qres.2001.2295, 2002.
Southon, J., Noronha, A. L., Cheng, H., Edwards, R. L., and Wang, Y.: A
high-resolution record of atmospheric 14C based on Hulu Cave
speleothem H82, Quaternary Sci. Rev., 33, 32–41,
https://doi.org/10.1016/j.quascirev.2011.11.022, 2012.
Staff, R. A., Schlolaut, G., Ramsey, C. B., Brock, F., Bryant, C. L.,
Kitagawa, H., Van der Plicht, J., Marshall, M. H., Brauer, A., and Lamb, H.
F.: Integration of the old and new Lake Suigetsu (Japan) terrestrial
radiocarbon calibration data sets, Radiocarbon, 55, 2049–2058, 2013.
Steffensen, J. P., Andersen, K. K., Bigler, M., Clausen, H. B., Dahl-Jensen,
D., Fischer, H., Goto-Azuma, K., Hansson, M., Johnsen, S. J., Jouzel, J.,
Masson-Delmotte, V., Popp, T., Rasmussen, S. O., Rothlisberger, R., Ruth, U.,
Stauffer, B., Siggaard-Andersen, M. L., Sveinbjornsdottir, A. E., Svensson,
A., and White, J. W.: High-resolution Greenland ice core data show abrupt
climate change happens in few years, Science, 321, 680–684,
https://doi.org/10.1126/science.1157707, 2008.
Stríkis, N. M., Cruz, F. W., Barreto, E. A. S., Naughton, F., Vuille,
M., Cheng, H., Voelker, A. H. L., Zhang, H., Karmann, I., Edwards, R. L.,
Auler, A. S., Santos, R. V., and Sales, H. R.: South American monsoon
response to iceberg discharge in the North Atlantic, P. Natl. Acad. Sci. USA,
115, 3788–3793, https://doi.org/10.1073/pnas.1717784115, 2018.
Stuiver, M. and Polach, H. A.: Discussion; reporting of C-14 data,
Radiocarbon, 19, 355–363, 1977.
Svensson, A., Biscaye, P. E., and Grousset, F. E.: Characterization of late
glacial continental dust in the Greenland Ice Core Project ice core, J.
Geophys. Res.-Atmos, 105, 4637–4656, https://doi.org/10.1029/1999JD901093, 2000.
Svensson, A., Andersen, K. K., Bigler, M., Clausen, H. B., Dahl-Jensen, D.,
Davies, S. M., Johnsen, S. J., Muscheler, R., Rasmussen, S. O., and
Röthlisberger, R.: The Greenland Ice Core Chronology 2005, 15–42 ka.
Part 2: comparison to other records, Quaternary Sci. Rev., 25, 3258–3267,
https://doi.org/10.1016/j.quascirev.2006.08.003, 2006.
Svensson, A., Andersen, K. K., Bigler, M., Clausen, H. B., Dahl-Jensen, D.,
Davies, S. M., Johnsen, S. J., Muscheler, R., Parrenin, F., Rasmussen, S. O.,
Röthlisberger, R., Seierstad, I., Steffensen, J. P., and Vinther, B. M.: A
60 000 year Greenland stratigraphic ice core chronology, Clim. Past, 4,
47–57, https://doi.org/10.5194/cp-4-47-2008, 2008.
Thomas, Z. A.: Using natural archives to detect climate and environmental
tipping points in the Earth System, Quaternary Sci. Rev., 152, 60–71,
https://doi.org/10.1016/j.quascirev.2016.09.026, 2016.
Trumbore, S.: AGE OF SOIL ORGANIC MATTER AND SOIL RESPIRATION: RADIOCARBON
CONSTRAINTS ON BELOWGROUND C DYNAMICS, Ecol. Appl., 10, 399–411,
https://doi.org/10.1890/1051-0761(2000)010[0399:AOSOMA]2.0.CO;2, 2000.
Turney, C. S. M., Thomas, Z. A., Hutchinson, D. K., Bradshaw, C. J. A.,
Brook, B. W., England, M. H., Fogwill, C. J., Jones, R. T., Palmer, J.,
Hughen, K. A., and Cooper, A.: Obliquity-expansion of North Atlantic sea ice
during the last glacial, Geophys. Res. Lett., 42, 10382–310390,
https://doi.org/10.1002/2015GL066344, 2015.
Turney, C. S. M., Palmer, J., Bronk Ramsey, C., Adolphi, F., Muscheler, R.,
Hughen, K. A., Staff, R. A., Jones, R. T., Thomas, Z. A., Fogwill, C. J., and
Hogg, A.: High-precision dating and correlation of ice, marine and
terrestrial sequences spanning Heinrich Event 3: Testing mechanisms of
interhemispheric change using New Zealand ancient kauri (Agathis australis),
Quaternary Sci. Rev., 137, 126–134,
https://doi.org/10.1016/j.quascirev.2016.02.005, 2016.
Veres, D., Bazin, L., Landais, A., Toyé Mahamadou Kele, H., Lemieux- Dudon,
B., Parrenin, F., Martinerie, P., Blayo, E., Blunier, T., Capron, E.,
Chappellaz, J., Rasmussen, S. O., Severi, M., Svensson, A., Vinther, B., and
Wolff, E. W.: The Antarctic ice core chronology (AICC2012): an optimized
multi-parameter and multi-site dating approach for the last 120 thousand
years, Clim. Past, 9, 1733–1748, https://doi.org/10.5194/cp-9-1733-2013,
2013.
Vinther, B. M., Clausen, H. B., Johnsen, S. J., Rasmussen, S. O., Andersen,
K. K., Buchardt, S. L., Dahl-Jensen, D., Seierstad, I. K., Siggaard-Andersen,
M. L., Steffensen, J. P., Svensson, A., Olsen, J., and Heinemeier, J.: A
synchronized dating of three Greenland ice cores throughout the Holocene, J.
Geophys. Res., 111, D13102, https://doi.org/10.1029/2005jd006921, 2006.
Vogt, S., Herzog, G. F., and Reedy, R. C.: Cosmogenic nuclides in
extraterrestrial materials, Rev. Geophys., 28, 253–275,
https://doi.org/10.1029/RG028i003p00253, 1990.
Wagner, G., Masarik, J., Beer, J., Baumgartner, S., Imboden, D., Kubik, P.
W., Synal, H. A., and Suter, M.: Reconstruction of the geomagnetic field
between 20 and 60 kyr BP from cosmogenic radionuclides in the GRIP ice
core, Nucl. Instrum. Meth. B, 172, 597–604,
https://doi.org/10.1016/S0168-583X(00)00285-8, 2000.
Wagner, G., Beer, J., Masarik, J., Muscheler, R., Kubik, P. W., Mende, W.,
Laj, C., Raisbeck, G. M., and Yiou, F.: Presence of the Solar de Vries Cycle
(∼205 years) during the Last Ice Age, Geophys. Res. Lett., 28,
303–306, https://doi.org/10.1029/2000gl006116, 2001a.
Wagner, G., Laj, C., Beer, J., Kissel, C., Muscheler, R., Masarik, J., and
Synal, H. A.: Reconstruction of the paleoaccumulation rate of central
Greenland during the last 75 kyr using the cosmogenic radionuclides
36Cl and 10Be and geomagnetic field intensity data, Earth
Planet. Sc. Lett., 193, 515–521, https://doi.org/10.1016/s0012-821x(01)00504-0, 2001b.
Wang, Y. J., Cheng, H., Edwards, R. L., An, Z. S., Wu, J. Y., Shen, C. C.,
and Dorale, J. A.: A high-resolution absolute-dated late Pleistocene Monsoon
record from Hulu Cave, China, Science, 294, 2345–2348,
https://doi.org/10.1126/science.1064618, 2001.
Watson, L. R., Van Doren, J. M., Davidovits, P., Worsnop, D. R., Zahniser, M.
S., and Kolb, C. E.: Uptake of HCl molecules by aqueous sulfuric acid
droplets as a function of acid concentration, J. Geophys. Res.-Atmos, 95,
5631–5638, https://doi.org/10.1029/JD095iD05p05631, 1990.
Werner, M., Mikolajewicz, U., Heimann, M., and Hoffmann, G.: Borehole versus
isotope temperatures on Greenland: Seasonality does matter, Geophys. Res.
Lett., 27, 723–726, https://doi.org/10.1029/1999gl006075, 2000.
Werner, M., Heimann, M., and Hoffmann, G.: Isotopic composition and origin of
polar precipitation in present and glacial climate simulations, Tellus B, 53,
53–71, https://doi.org/10.1034/j.1600-0889.2001.01154.x, 2001.
Yiou, F., Raisbeck, G. M., Baumgartner, S., Beer, J., Hammer, C., Johnsen,
S., Jouzel, J., Kubik, P. W., Lestringuez, J., Stiévenard, M., Suter, M.,
and Yiou, P.: Beryllium 10 in the Greenland Ice Core Project ice core at
Summit, Greenland, J. Geophys. Res., 102, 26783, https://doi.org/10.1029/97jc01265, 1997.
Zerle, L., Faestermann, T., Knie, K., Korschinek, G., Nolte, E., Beer, J.,
and Schotterer, U.: The 41Ca bomb pulse and atmospheric transport
of radionuclides, J. Geophys. Res.-Atmos, 102, 19517–19527,
https://doi.org/10.1029/97JD00701, 1997.
Short summary
The last glacial period was characterized by a number of rapid climate changes seen, for example, as abrupt warmings in Greenland and changes in monsoon rainfall intensity. However, due to chronological uncertainties it is challenging to know how tightly coupled these changes were. Here we exploit cosmogenic signals caused by changes in the Sun and Earth magnetic fields to link different climate archives and improve our understanding of the dynamics of abrupt climate change.
The last glacial period was characterized by a number of rapid climate changes seen, for...
