Articles | Volume 16, issue 4
https://doi.org/10.5194/cp-16-1451-2020
© Author(s) 2020. 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-16-1451-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Aug 2020
Research article |
| 07 Aug 2020
| 07 Aug 2020
Sea surface temperature in the Indian sector of the Southern Ocean over the Late Glacial and Holocene
Lisa Claire Orme
CORRESPONDING AUTHOR
Norwegian Polar Institute, Tromsø, 9296, Norway
ICARUS, Department of Geography, Maynooth University, Maynooth,
Ireland
Xavier Crosta
UMR 5805 EPOC, Université de Bordeaux, Bordeaux, France
Arto Miettinen
Norwegian Polar Institute, Tromsø, 9296, Norway
Ecosystems and Environment Research Programme, University of Helsinki, Helsinki, Finland
Dmitry V. Divine
Norwegian Polar Institute, Tromsø, 9296, Norway
Katrine Husum
Norwegian Polar Institute, Tromsø, 9296, Norway
Elisabeth Isaksson
Norwegian Polar Institute, Tromsø, 9296, Norway
Lukas Wacker
Department of Physics, ETH Zürich, 8093 Zurich, Switzerland
Rahul Mohan
National Centre for Polar and Ocean Research (NCPOR), Ministry of
Earth Sciences, Vasco-da-Gama, Goa 403804, India
Olivier Ther
UMR 5805 EPOC, Université de Bordeaux, Bordeaux, France
Minoru Ikehara
Center for Advanced Marine Core Research, Kochi University, Nankoku, 783-8502, Japan
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Andrea Spolaor, Federico Scoto, Catherine Larose, Elena Barbaro, Francois Burgay, Mats P. Bjorkman, David Cappelletti, Federico Dallo, Fabrizio de Blasi, Dmitry Divine, Giuliano Dreossi, Jacopo Gabrieli, Elisabeth Isaksson, Jack Kohler, Tonu Martma, Louise S. Schmidt, Thomas V. Schuler, Barbara Stenni, Clara Turetta, Bartłomiej Luks, Mathieu Casado, and Jean-Charles Gallet
The Cryosphere, 18, 307–320, https://doi.org/10.5194/tc-18-307-2024, https://doi.org/10.5194/tc-18-307-2024, 2024
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We evaluate the impact of the increased snowmelt on the preservation of the oxygen isotope (δ18O) signal in firn records recovered from the top of the Holtedahlfonna ice field located in the Svalbard archipelago. Thanks to a multidisciplinary approach we demonstrate a progressive deterioration of the isotope signal in the firn core. We link the degradation of the δ18O signal to the increased occurrence and intensity of melt events associated with the rapid warming occurring in the archipelago.
Emma Nilsson, Carmen Paulina Vega, Dmitry Divine, Anja Eichler, Tonu Martma, Robert Mulvaney, Elisabeth Schlosser, Margit Schwikowski, and Elisabeth Isaksson
EGUsphere, https://doi.org/10.5194/egusphere-2023-3156, https://doi.org/10.5194/egusphere-2023-3156, 2024
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To project future climate change it is necessary to understand paleoclimate including past sea ice conditions. We have investigated methane sulphonic acid (MSA) in Antarctic firn and ice cores to reconstruct sea ice extent (SIE) and found that the MSA – SIE as well as the MSA – phytoplankton biomass relationship varies across the different firn and ice cores. These inconsistencies in correlations across records suggest that MSA in Fimbul Ice Shelf cores does not reliably indicate regional SIE.
Isabel A. Dove, Ian W. Bishop, Xavier Crosta, Natascha Riedinger, R. Patrick Kelly, and Rebecca S. Robinson
EGUsphere, https://doi.org/10.5194/egusphere-2023-2564, https://doi.org/10.5194/egusphere-2023-2564, 2023
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The diatom-bound nitrogen isotope proxy is used to study how efficiently diatoms in the Southern Ocean help to remove CO2 from the atmosphere, but may be biased by different diatom species. We examine a specific type of diatom, Chaetoceros resting spores (CRS), commonly preserved in Southern Ocean sediments. We find that CRS record surprisingly low δ15NDB values compared to other diatoms, yet changes in their relative abundance over time does not significantly bias previously published records.
Kevin Zoller, Jan Sverre Laberg, Tom Arne Rydningen, Katrine Husum, and Matthias Forwick
Clim. Past, 19, 1321–1343, https://doi.org/10.5194/cp-19-1321-2023, https://doi.org/10.5194/cp-19-1321-2023, 2023
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Marine geologic data from NE Greenland provide new information about the behavior of the Greenland Ice Sheet from the last glacial period to present. Seafloor landforms suggest that a large, fast-flowing ice stream moved south through southern Dove Bugt. This region is believed to have been deglaciated from at least 11.4 ka cal BP. Ice in an adjacent fjord, Bessel Fjord, may have retreated to its modern position by 7.1 ka cal BP, and the ice halted or readvanced multiple times upon deglaciation.
Marta Santos-Garcia, Raja S. Ganeshram, Robyn E. Tuerena, Margot C. F. Debyser, Katrine Husum, Philipp Assmy, and Haakon Hop
Biogeosciences, 19, 5973–6002, https://doi.org/10.5194/bg-19-5973-2022, https://doi.org/10.5194/bg-19-5973-2022, 2022
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Terrestrial sources of nitrate are important contributors to the nutrient pool in the fjords of Kongsfjorden and Rijpfjorden in Svalbard during the summer, and they sustain most of the fjord primary productivity. Ongoing tidewater glacier retreat is postulated to favour light limitation and less dynamic circulation in fjords. This is suggested to encourage the export of nutrients to the middle and outer part of the fjord system, which may enhance primary production within and in offshore areas.
Matthew Chadwick, Xavier Crosta, Oliver Esper, Lena Thöle, and Karen E. Kohfeld
Clim. Past, 18, 1815–1829, https://doi.org/10.5194/cp-18-1815-2022, https://doi.org/10.5194/cp-18-1815-2022, 2022
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Algae preserved in seafloor sediments have allowed us to reconstruct how Antarctic sea ice has varied between cold and warm time periods in the last 130 000 years. The patterns and timings of sea-ice increase and decrease vary between different parts of the Southern Ocean. Sea ice is most sensitive to changing climate at the external edges of Southern Ocean gyres (large areas of rotating ocean currents).
Helen Eri Amsler, Lena Mareike Thöle, Ingrid Stimac, Walter Geibert, Minoru Ikehara, Gerhard Kuhn, Oliver Esper, and Samuel Laurent Jaccard
Clim. Past, 18, 1797–1813, https://doi.org/10.5194/cp-18-1797-2022, https://doi.org/10.5194/cp-18-1797-2022, 2022
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We present sedimentary redox-sensitive trace metal records from five sediment cores retrieved from the SW Indian Ocean. These records are indicative of oxygen-depleted conditions during cold periods and enhanced oxygenation during interstadials. Our results thus suggest that deep-ocean oxygenation changes were mainly controlled by ocean ventilation and that a generally more sluggish circulation contributed to sequestering remineralized carbon away from the atmosphere during glacial periods.
Xavier Crosta, Karen E. Kohfeld, Helen C. Bostock, Matthew Chadwick, Alice Du Vivier, Oliver Esper, Johan Etourneau, Jacob Jones, Amy Leventer, Juliane Müller, Rachael H. Rhodes, Claire S. Allen, Pooja Ghadi, Nele Lamping, Carina B. Lange, Kelly-Anne Lawler, David Lund, Alice Marzocchi, Katrin J. Meissner, Laurie Menviel, Abhilash Nair, Molly Patterson, Jennifer Pike, Joseph G. Prebble, Christina Riesselman, Henrik Sadatzki, Louise C. Sime, Sunil K. Shukla, Lena Thöle, Maria-Elena Vorrath, Wenshen Xiao, and Jiao Yang
Clim. Past, 18, 1729–1756, https://doi.org/10.5194/cp-18-1729-2022, https://doi.org/10.5194/cp-18-1729-2022, 2022
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Despite its importance in the global climate, our knowledge of Antarctic sea-ice changes throughout the last glacial–interglacial cycle is extremely limited. As part of the Cycles of Sea Ice Dynamics in the Earth system (C-SIDE) Working Group, we review marine- and ice-core-based sea-ice proxies to provide insights into their applicability and limitations. By compiling published records, we provide information on Antarctic sea-ice dynamics over the past 130 000 years.
Ryan A. Green, Laurie Menviel, Katrin J. Meissner, Xavier Crosta, Deepak Chandan, Gerrit Lohmann, W. Richard Peltier, Xiaoxu Shi, and Jiang Zhu
Clim. Past, 18, 845–862, https://doi.org/10.5194/cp-18-845-2022, https://doi.org/10.5194/cp-18-845-2022, 2022
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Climate models are used to predict future climate changes and as such, it is important to assess their performance in simulating past climate changes. We analyze seasonal sea-ice cover over the Southern Ocean simulated from numerical PMIP3, PMIP4 and LOVECLIM simulations during the Last Glacial Maximum (LGM). Comparing these simulations to proxy data, we provide improved estimates of LGM seasonal sea-ice cover. Our estimate of summer sea-ice extent is 20 %–30 % larger than previous estimates.
Jacob Jones, Karen E. Kohfeld, Helen Bostock, Xavier Crosta, Melanie Liston, Gavin Dunbar, Zanna Chase, Amy Leventer, Harris Anderson, and Geraldine Jacobsen
Clim. Past, 18, 465–483, https://doi.org/10.5194/cp-18-465-2022, https://doi.org/10.5194/cp-18-465-2022, 2022
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We provide new winter sea ice and summer sea surface temperature estimates for marine core TAN1302-96 (59° S, 157° E) in the Southern Ocean. We find that sea ice was not consolidated over the core site until ~65 ka and therefore believe that sea ice may not have been a major contributor to early glacial CO2 drawdown. Sea ice does appear to have coincided with Antarctic Intermediate Water production and subduction, suggesting it may have influenced intermediate ocean circulation changes.
Matthew Chadwick, Claire S. Allen, Louise C. Sime, Xavier Crosta, and Claus-Dieter Hillenbrand
Clim. Past, 18, 129–146, https://doi.org/10.5194/cp-18-129-2022, https://doi.org/10.5194/cp-18-129-2022, 2022
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Algae preserved in marine sediments have allowed us to reconstruct how much winter sea ice was present around Antarctica during a past time period (130 000 years ago) when the climate was warmer than today. The patterns of sea-ice increase and decrease vary between different parts of the Southern Ocean. The Pacific sector has a largely stable sea-ice extent, whereas the amount of sea ice in the Atlantic sector is much more variable with bigger decreases and increases than other regions.
Kelly-Anne Lawler, Giuseppe Cortese, Matthieu Civel-Mazens, Helen Bostock, Xavier Crosta, Amy Leventer, Vikki Lowe, John Rogers, and Leanne K. Armand
Earth Syst. Sci. Data, 13, 5441–5453, https://doi.org/10.5194/essd-13-5441-2021, https://doi.org/10.5194/essd-13-5441-2021, 2021
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Radiolarians found in marine sediments are used to reconstruct past Southern Ocean environments. This requires a comprehensive modern dataset. The Southern Ocean Radiolarian (SO-RAD) dataset includes radiolarian counts from sites in the Southern Ocean. It can be used for palaeoceanographic reconstructions or to study modern species diversity and abundance. We describe the data collection and include recommendations for users unfamiliar with procedures typically used by the radiolarian community.
Caroline Welte, Jens Fohlmeister, Melina Wertnik, Lukas Wacker, Bodo Hattendorf, Timothy I. Eglinton, and Christoph Spötl
Clim. Past, 17, 2165–2177, https://doi.org/10.5194/cp-17-2165-2021, https://doi.org/10.5194/cp-17-2165-2021, 2021
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Stalagmites are valuable climate archives, but unlike other proxies the use of stable carbon isotopes (δ13C) is still difficult. A stalagmite from the Austrian Alps was analyzed using a new laser ablation method for fast radiocarbon (14C) analysis. This allowed 14C and δ13C to be combined, showing that besides soil and bedrock a third source is contributing during periods of warm, wet climate: old organic matter.
Kate E. Ashley, Xavier Crosta, Johan Etourneau, Philippine Campagne, Harry Gilchrist, Uthmaan Ibraheem, Sarah E. Greene, Sabine Schmidt, Yvette Eley, Guillaume Massé, and James Bendle
Biogeosciences, 18, 5555–5571, https://doi.org/10.5194/bg-18-5555-2021, https://doi.org/10.5194/bg-18-5555-2021, 2021
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We explore the potential for the use of carbon isotopes of algal fatty acid as a new proxy for past primary productivity in Antarctic coastal zones. Coastal polynyas are hotspots of primary productivity and are known to draw down CO2 from the atmosphere. Reconstructions of past productivity changes could provide a baseline for the role of these areas as sinks for atmospheric CO2.
Vojtěch Abraham, Sheila Hicks, Helena Svobodová-Svitavská, Elissaveta Bozilova, Sampson Panajiotidis, Mariana Filipova-Marinova, Christin Eldegard Jensen, Spassimir Tonkov, Irena Agnieszka Pidek, Joanna Święta-Musznicka, Marcelina Zimny, Eliso Kvavadze, Anna Filbrandt-Czaja, Martina Hättestrand, Nurgül Karlıoğlu Kılıç, Jana Kosenko, Maria Nosova, Elena Severova, Olga Volkova, Margrét Hallsdóttir, Laimdota Kalniņa, Agnieszka M. Noryśkiewicz, Bożena Noryśkiewicz, Heather Pardoe, Areti Christodoulou, Tiiu Koff, Sonia L. Fontana, Teija Alenius, Elisabeth Isaksson, Heikki Seppä, Siim Veski, Anna Pędziszewska, Martin Weiser, and Thomas Giesecke
Biogeosciences, 18, 4511–4534, https://doi.org/10.5194/bg-18-4511-2021, https://doi.org/10.5194/bg-18-4511-2021, 2021
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We present a continental dataset of pollen accumulation rates (PARs) collected by pollen traps. This absolute measure of pollen rain (grains cm−2 yr−1) has a positive relationship to current vegetation and latitude. Trap and fossil PARs have similar values within one region, so it opens up possibilities for using fossil PARs to reconstruct past changes in plant biomass and primary productivity. The dataset is available in the Neotoma Paleoecology Database.
Anja Rösel, Sinead Louise Farrell, Vishnu Nandan, Jaqueline Richter-Menge, Gunnar Spreen, Dmitry V. Divine, Adam Steer, Jean-Charles Gallet, and Sebastian Gerland
The Cryosphere, 15, 2819–2833, https://doi.org/10.5194/tc-15-2819-2021, https://doi.org/10.5194/tc-15-2819-2021, 2021
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Recent observations in the Arctic suggest a significant shift towards a snow–ice regime caused by deep snow on thin sea ice which may result in a flooding of the snowpack. These conditions cause the brine wicking and saturation of the basal snow layers which lead to a subsequent underestimation of snow depth from snow radar mesurements. As a consequence the calculated sea ice thickness will be biased towards higher values.
Franziska Slotta, Lukas Wacker, Frank Riedel, Karl-Uwe Heußner, Kai Hartmann, and Gerhard Helle
Biogeosciences, 18, 3539–3564, https://doi.org/10.5194/bg-18-3539-2021, https://doi.org/10.5194/bg-18-3539-2021, 2021
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The African baobab is a challenging climate and environmental archive for its semi-arid habitat due to dating uncertainties and parenchyma-rich wood anatomy. Annually resolved F14C data of tree-ring cellulose (1941–2005) from a tree in Oman show the annual character of the baobab’s growth rings but were up to 8.8 % lower than expected for 1964–1967. Subseasonal δ13C and δ18O patterns reveal years with low average monsoon rain as well as heavy rainfall events from pre-monsoonal cyclones.
Fanny Lhardy, Nathaëlle Bouttes, Didier M. Roche, Xavier Crosta, Claire Waelbroeck, and Didier Paillard
Clim. Past, 17, 1139–1159, https://doi.org/10.5194/cp-17-1139-2021, https://doi.org/10.5194/cp-17-1139-2021, 2021
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Climate models struggle to simulate a LGM ocean circulation in agreement with paleotracer data. Using a set of simulations, we test the impact of boundary conditions and other modelling choices. Model–data comparisons of sea-surface temperatures and sea-ice cover support an overall cold Southern Ocean, with implications on the AMOC strength. Changes in implemented boundary conditions are not sufficient to simulate a shallower AMOC; other mechanisms to better represent convection are required.
Ove H. Meisel, Joshua F. Dean, Jorien E. Vonk, Lukas Wacker, Gert-Jan Reichart, and Han Dolman
Biogeosciences, 18, 2241–2258, https://doi.org/10.5194/bg-18-2241-2021, https://doi.org/10.5194/bg-18-2241-2021, 2021
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Arctic permafrost lakes form thaw bulbs of unfrozen soil (taliks) beneath them where carbon degradation and greenhouse gas production are increased. We analyzed the stable carbon isotopes of Alaskan talik sediments and their porewater dissolved organic carbon and found that the top layers of these taliks are likely more actively degraded than the deeper layers. This in turn implies that these top layers are likely also more potent greenhouse gas producers than the underlying deeper layers.
Kate E. Ashley, Robert McKay, Johan Etourneau, Francisco J. Jimenez-Espejo, Alan Condron, Anna Albot, Xavier Crosta, Christina Riesselman, Osamu Seki, Guillaume Massé, Nicholas R. Golledge, Edward Gasson, Daniel P. Lowry, Nicholas E. Barrand, Katelyn Johnson, Nancy Bertler, Carlota Escutia, Robert Dunbar, and James A. Bendle
Clim. Past, 17, 1–19, https://doi.org/10.5194/cp-17-1-2021, https://doi.org/10.5194/cp-17-1-2021, 2021
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We present a multi-proxy record of Holocene glacial meltwater input, sediment transport, and sea-ice variability off East Antarctica. Our record shows that a rapid Antarctic sea-ice increase during the mid-Holocene (~ 4.5 ka) occurred against a backdrop of increasing glacial meltwater input and gradual climate warming. We suggest that mid-Holocene ice shelf cavity expansion led to cooling of surface waters and sea-ice growth, which slowed basal ice shelf melting.
Ingrid Leirvik Olsen, Tom Arne Rydningen, Matthias Forwick, Jan Sverre Laberg, and Katrine Husum
The Cryosphere, 14, 4475–4494, https://doi.org/10.5194/tc-14-4475-2020, https://doi.org/10.5194/tc-14-4475-2020, 2020
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We present marine geoscientific data from Store Koldewey Trough, one of the largest glacial troughs offshore NE Greenland, to reconstruct the ice drainage pathways, ice sheet extent and ice stream dynamics of this sector during the last glacial and deglaciation. The complex landform assemblage in the trough reflects a dynamic retreat with several periods of stabilization and readvances, interrupting the deglaciation. Estimates indicate that the ice front locally retreated between 80–400 m/year.
Bronwen L. Konecky, Nicholas P. McKay, Olga V. Churakova (Sidorova), Laia Comas-Bru, Emilie P. Dassié, Kristine L. DeLong, Georgina M. Falster, Matt J. Fischer, Matthew D. Jones, Lukas Jonkers, Darrell S. Kaufman, Guillaume Leduc, Shreyas R. Managave, Belen Martrat, Thomas Opel, Anais J. Orsi, Judson W. Partin, Hussein R. Sayani, Elizabeth K. Thomas, Diane M. Thompson, Jonathan J. Tyler, Nerilie J. Abram, Alyssa R. Atwood, Olivier Cartapanis, Jessica L. Conroy, Mark A. Curran, Sylvia G. Dee, Michael Deininger, Dmitry V. Divine, Zoltán Kern, Trevor J. Porter, Samantha L. Stevenson, Lucien von Gunten, and Iso2k Project Members
Earth Syst. Sci. Data, 12, 2261–2288, https://doi.org/10.5194/essd-12-2261-2020, https://doi.org/10.5194/essd-12-2261-2020, 2020
Jan Erik Arndt, Robert D. Larter, Claus-Dieter Hillenbrand, Simon H. Sørli, Matthias Forwick, James A. Smith, and Lukas Wacker
The Cryosphere, 14, 2115–2135, https://doi.org/10.5194/tc-14-2115-2020, https://doi.org/10.5194/tc-14-2115-2020, 2020
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We interpret landforms on the seabed and investigate sediment cores to improve our understanding of the past ice sheet development in this poorly understood part of Antarctica. Recent crack development of the Brunt ice shelf has raised concerns about its stability and the security of the British research station Halley. We describe ramp-shaped bedforms that likely represent ice shelf grounding and stabilization locations of the past that may reflect an analogue to the process going on now.
Katrine Elnegaard Hansen, Jacques Giraudeau, Lukas Wacker, Christof Pearce, and Marit-Solveig Seidenkrantz
Clim. Past, 16, 1075–1095, https://doi.org/10.5194/cp-16-1075-2020, https://doi.org/10.5194/cp-16-1075-2020, 2020
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In this study, we present RainNet, a deep convolutional neural network for radar-based precipitation nowcasting, which was trained to predict continuous precipitation intensities at a lead time of 5 min. RainNet significantly outperformed the benchmark models at all lead times up to 60 min. Yet an undesirable property of RainNet predictions is the level of spatial smoothing. Obviously, RainNet learned an optimal level of smoothing to produce a nowcast at 5 min lead time.
Tine Nilsen, Dmitry V. Divine, Annika Hofgaard, Andreas Born, Johann Jungclaus, and Igor Drobyshev
Clim. Past Discuss., https://doi.org/10.5194/cp-2019-123, https://doi.org/10.5194/cp-2019-123, 2019
Revised manuscript not accepted
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Using a set of three climate model simulations we cannot find a consistent relationship between atmospheric conditions favorable for forest fire activity in northern Scandinavia and weaker ocean circulation in the North Atlantic subpolar gyre on seasonal timescales. In the literature there is support of such a relationship for longer timescales. With the motivation to improve seasonal prediction systems, we conclude that the gyre circulation alone does not indicate forthcoming model drought.
Michael Boy, Erik S. Thomson, Juan-C. Acosta Navarro, Olafur Arnalds, Ekaterina Batchvarova, Jaana Bäck, Frank Berninger, Merete Bilde, Zoé Brasseur, Pavla Dagsson-Waldhauserova, Dimitri Castarède, Maryam Dalirian, Gerrit de Leeuw, Monika Dragosics, Ella-Maria Duplissy, Jonathan Duplissy, Annica M. L. Ekman, Keyan Fang, Jean-Charles Gallet, Marianne Glasius, Sven-Erik Gryning, Henrik Grythe, Hans-Christen Hansson, Margareta Hansson, Elisabeth Isaksson, Trond Iversen, Ingibjorg Jonsdottir, Ville Kasurinen, Alf Kirkevåg, Atte Korhola, Radovan Krejci, Jon Egill Kristjansson, Hanna K. Lappalainen, Antti Lauri, Matti Leppäranta, Heikki Lihavainen, Risto Makkonen, Andreas Massling, Outi Meinander, E. Douglas Nilsson, Haraldur Olafsson, Jan B. C. Pettersson, Nønne L. Prisle, Ilona Riipinen, Pontus Roldin, Meri Ruppel, Matthew Salter, Maria Sand, Øyvind Seland, Heikki Seppä, Henrik Skov, Joana Soares, Andreas Stohl, Johan Ström, Jonas Svensson, Erik Swietlicki, Ksenia Tabakova, Throstur Thorsteinsson, Aki Virkkula, Gesa A. Weyhenmeyer, Yusheng Wu, Paul Zieger, and Markku Kulmala
Atmos. Chem. Phys., 19, 2015–2061, https://doi.org/10.5194/acp-19-2015-2019, https://doi.org/10.5194/acp-19-2015-2019, 2019
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The Nordic Centre of Excellence CRAICC (Cryosphere–Atmosphere Interactions in a Changing Arctic Climate), funded by NordForsk in the years 2011–2016, is the largest joint Nordic research and innovation initiative to date and aimed to strengthen research and innovation regarding climate change issues in the Nordic region. The paper presents an overview of the main scientific topics investigated and provides a state-of-the-art comprehensive summary of what has been achieved in CRAICC.
Robert McKay, Neville Exon, Dietmar Müller, Karsten Gohl, Michael Gurnis, Amelia Shevenell, Stuart Henrys, Fumio Inagaki, Dhananjai Pandey, Jessica Whiteside, Tina van de Flierdt, Tim Naish, Verena Heuer, Yuki Morono, Millard Coffin, Marguerite Godard, Laura Wallace, Shuichi Kodaira, Peter Bijl, Julien Collot, Gerald Dickens, Brandon Dugan, Ann G. Dunlea, Ron Hackney, Minoru Ikehara, Martin Jutzeler, Lisa McNeill, Sushant Naik, Taryn Noble, Bradley Opdyke, Ingo Pecher, Lowell Stott, Gabriele Uenzelmann-Neben, Yatheesh Vadakkeykath, and Ulrich G. Wortmann
Sci. Dril., 24, 61–70, https://doi.org/10.5194/sd-24-61-2018, https://doi.org/10.5194/sd-24-61-2018, 2018
Dimitri Osmont, Isabel A. Wendl, Loïc Schmidely, Michael Sigl, Carmen P. Vega, Elisabeth Isaksson, and Margit Schwikowski
Atmos. Chem. Phys., 18, 12777–12795, https://doi.org/10.5194/acp-18-12777-2018, https://doi.org/10.5194/acp-18-12777-2018, 2018
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This study presents the first long-term and high-resolution refractory black carbon (rBC) ice core record from Svalbard, spanning the last 800 years. Our results show that rBC has had a predominant anthropogenic origin since the beginning of the Industrial Revolution in Europe and that rBC concentrations have been declining in the last 40 years. We discuss the impact of 20th century snowmelt on our record. We reconstruct biomass burning trends prior to 1800 by using a multi-proxy approach.
Ariadna Salabarnada, Carlota Escutia, Ursula Röhl, C. Hans Nelson, Robert McKay, Francisco J. Jiménez-Espejo, Peter K. Bijl, Julian D. Hartman, Stephanie L. Strother, Ulrich Salzmann, Dimitris Evangelinos, Adrián López-Quirós, José Abel Flores, Francesca Sangiorgi, Minoru Ikehara, and Henk Brinkhuis
Clim. Past, 14, 991–1014, https://doi.org/10.5194/cp-14-991-2018, https://doi.org/10.5194/cp-14-991-2018, 2018
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Here we reconstruct ice sheet and paleoceanographic configurations in the East Antarctic Wilkes Land margin based on a multi-proxy study conducted in late Oligocene (26–25 Ma) sediments from IODP Site U1356. The new obliquity-forced glacial–interglacial sedimentary model shows that, under the high CO2 values of the late Oligocene, ice sheets had mostly retreated to their terrestrial margins and the ocean was very dynamic with shifting positions of the polar fronts and associated water masses.
Tine Nilsen, Johannes P. Werner, Dmitry V. Divine, and Martin Rypdal
Clim. Past, 14, 947–967, https://doi.org/10.5194/cp-14-947-2018, https://doi.org/10.5194/cp-14-947-2018, 2018
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The BARCAST climate field reconstruction method is tested using synthetic data experiments. It is demonstrated that the output reconstructions have altered statistical properties compared with the input data, but they are also not necessarily consistent with the model assumption of the reconstruction method. The conclusion is that the statistical properties of a reconstruction not only reflect the statistics of the real climate, but they may very well be affected by the manipulation of the data.
Mackenzie M. Grieman, Murat Aydin, Elisabeth Isaksson, Margit Schwikowski, and Eric S. Saltzman
Clim. Past, 14, 637–651, https://doi.org/10.5194/cp-14-637-2018, https://doi.org/10.5194/cp-14-637-2018, 2018
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This study presents organic acid levels in an ice core from Svalbard over the past 800 years. These acids are produced from wildfire emissions and transported as aerosol. Organic acid levels are high early in the record and decline until the 20th century. Siberia and Europe are likely the primary source regions of the fire emissions. The data are similar to those from a Siberian ice core prior to 1400 CE. The timing of the divergence after 1400 CE is similar to a shift in North Atlantic climate.
Carmen Paulina Vega, Elisabeth Isaksson, Elisabeth Schlosser, Dmitry Divine, Tõnu Martma, Robert Mulvaney, Anja Eichler, and Margit Schwikowski-Gigar
The Cryosphere, 12, 1681–1697, https://doi.org/10.5194/tc-12-1681-2018, https://doi.org/10.5194/tc-12-1681-2018, 2018
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Ions were measured in firn and ice cores from Fimbul Ice Shelf, Antarctica, to evaluate sea-salt loads. A significant sixfold increase in sea salts was found in the S100 core after 1950s which suggests that it contains a more local sea-salt signal, dominated by processes during sea-ice formation in the neighbouring waters. In contrast, firn cores from three ice rises register the larger-scale signal of atmospheric flow conditions and transport of sea-salt aerosols produced over open water.
Bryan C. Lougheed, Brett Metcalfe, Ulysses S. Ninnemann, and Lukas Wacker
Clim. Past, 14, 515–526, https://doi.org/10.5194/cp-14-515-2018, https://doi.org/10.5194/cp-14-515-2018, 2018
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Palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid climate change, but only a small proportion of the ocean is suitable for such reconstructions using the existing state of the art, i.e. the age–depth approach. We use dual radiocarbon (14C) and stable isotope analysis on single foraminifera to bypass the long-standing age–depth approach, thus facilitating past ocean chemistry reconstructions from vast, previously untapped ocean areas.
Nathaelle Bouttes, Didier Swingedouw, Didier M. Roche, Maria F. Sanchez-Goni, and Xavier Crosta
Clim. Past, 14, 239–253, https://doi.org/10.5194/cp-14-239-2018, https://doi.org/10.5194/cp-14-239-2018, 2018
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Atmospheric CO2 is key for climate change. CO2 is lower during the oldest warm period of the last million years, the interglacials, than during the most recent ones (since 430 000 years ago). This difference has not been explained yet, but could be due to changes of ocean circulation. We test this hypothesis and the role of vegetation and ice sheets using an intermediate complexity model. We show that only small changes of CO2 can be obtained, underlying missing feedbacks or mechanisms.
Liviu Giosan, Camilo Ponton, Muhammed Usman, Jerzy Blusztajn, Dorian Q. Fuller, Valier Galy, Negar Haghipour, Joel E. Johnson, Cameron McIntyre, Lukas Wacker, and Timothy I. Eglinton
Earth Surf. Dynam., 5, 781–789, https://doi.org/10.5194/esurf-5-781-2017, https://doi.org/10.5194/esurf-5-781-2017, 2017
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A reconstruction of erosion in the core monsoon zone of India provides unintuitive but fundamental insights: in contrast to semiarid regions that experience enhanced erosion during erratic rain events, the monsoon is annual and acts as a veritable
erosional pumpaccelerating when the land cover is minimal. The existence of such a monsoon erosional pump promises to reconcile conflicting views on the land–sea sediment and carbon transfer as well as the monsoon evolution on longer timescales.
Barbara Stenni, Mark A. J. Curran, Nerilie J. Abram, Anais Orsi, Sentia Goursaud, Valerie Masson-Delmotte, Raphael Neukom, Hugues Goosse, Dmitry Divine, Tas van Ommen, Eric J. Steig, Daniel A. Dixon, Elizabeth R. Thomas, Nancy A. N. Bertler, Elisabeth Isaksson, Alexey Ekaykin, Martin Werner, and Massimo Frezzotti
Clim. Past, 13, 1609–1634, https://doi.org/10.5194/cp-13-1609-2017, https://doi.org/10.5194/cp-13-1609-2017, 2017
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Within PAGES Antarctica2k, we build an enlarged database of ice core water stable isotope records. We produce isotopic composites and temperature reconstructions since 0 CE for seven distinct Antarctic regions. We find a significant cooling trend from 0 to 1900 CE across all regions. Since 1900 CE, significant warming trends are identified for three regions. Only for the Antarctic Peninsula is this most recent century-scale trend unusual in the context of last-2000-year natural variability.
Elizabeth R. Thomas, J. Melchior van Wessem, Jason Roberts, Elisabeth Isaksson, Elisabeth Schlosser, Tyler J. Fudge, Paul Vallelonga, Brooke Medley, Jan Lenaerts, Nancy Bertler, Michiel R. van den Broeke, Daniel A. Dixon, Massimo Frezzotti, Barbara Stenni, Mark Curran, and Alexey A. Ekaykin
Clim. Past, 13, 1491–1513, https://doi.org/10.5194/cp-13-1491-2017, https://doi.org/10.5194/cp-13-1491-2017, 2017
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Regional Antarctic snow accumulation derived from 79 ice core records is evaluated as part of the PAGES Antarctica 2k working group. Our results show that surface mass balance for the total Antarctic ice sheet has increased at a rate of 7 ± 0.13 Gt dec-1 since 1800 AD, representing a net reduction in sea level of ~ 0.02 mm dec-1 since 1800 and ~ 0.04 mm dec-1 since 1900 AD. The largest contribution is from the Antarctic Peninsula.
Meri M. Ruppel, Joana Soares, Jean-Charles Gallet, Elisabeth Isaksson, Tõnu Martma, Jonas Svensson, Jack Kohler, Christina A. Pedersen, Sirkku Manninen, Atte Korhola, and Johan Ström
Atmos. Chem. Phys., 17, 12779–12795, https://doi.org/10.5194/acp-17-12779-2017, https://doi.org/10.5194/acp-17-12779-2017, 2017
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Black carbon (BC) deposition enhances Arctic warming and melting. We present Svalbard ice core BC data from 2005 to 2015, comparing the results with chemical transport model data. The ice core and modelled BC deposition trends clearly deviate from measured and observed atmospheric concentration trends, and thus meteorological processes such as precipitation and scavenging efficiency seem to have a stronger influence on the BC deposition trend than BC emission or atmospheric concentration trends.
Ane S. Fors, Dmitry V. Divine, Anthony P. Doulgeris, Angelika H. H. Renner, and Sebastian Gerland
The Cryosphere, 11, 755–771, https://doi.org/10.5194/tc-11-755-2017, https://doi.org/10.5194/tc-11-755-2017, 2017
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This paper investigates the signature of melt ponds in satellite-borne synthetic aperture radar (SAR) imagery. A comparison between helicopter-borne images of drifting first-year ice and polarimetric X-band SAR images shows relations between observed melt pond fraction and several polarimetric SAR features. Melt ponds strongly influence the Arctic sea ice energy budget, and the results imply prospective opportunities for expanded monitoring of melt ponds from space.
Ulrike Dusek, Regina Hitzenberger, Anne Kasper-Giebl, Magdalena Kistler, Harro A. J. Meijer, Sönke Szidat, Lukas Wacker, Rupert Holzinger, and Thomas Röckmann
Atmos. Chem. Phys., 17, 3233–3251, https://doi.org/10.5194/acp-17-3233-2017, https://doi.org/10.5194/acp-17-3233-2017, 2017
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Measurements of the radioactive carbon isotope 14C allow to identify the sources of aerosol carbon. We report an extensive 14C source apportionment record in the Netherlands with samples covering a whole year. We discovered that long-range transport has a large influence on aerosol carbon levels. Fossil fuel carbon is least influenced by long-range transport and more regional in origin. Biomass burning seems to be a minor source of aerosol carbon in the Netherlands.
Carmen P. Vega, Elisabeth Schlosser, Dmitry V. Divine, Jack Kohler, Tõnu Martma, Anja Eichler, Margit Schwikowski, and Elisabeth Isaksson
The Cryosphere, 10, 2763–2777, https://doi.org/10.5194/tc-10-2763-2016, https://doi.org/10.5194/tc-10-2763-2016, 2016
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Surface mass balance and water stable isotopes from firn cores on three ice rises at Fimbul Ice Shelf are reported. The results suggest that the ice rises are suitable sites for the retrieval of longer firn and ice cores. The first deuterium excess data for the area suggests a possible role of seasonal moisture transport changes on the annual isotopic signal. Large-scale atmospheric circulation patterns most likely provide the dominant influence on water stable isotope ratios at the sites.
Philippine Campagne, Xavier Crosta, Sabine Schmidt, Marie Noëlle Houssais, Olivier Ther, and Guillaume Massé
Biogeosciences, 13, 4205–4218, https://doi.org/10.5194/bg-13-4205-2016, https://doi.org/10.5194/bg-13-4205-2016, 2016
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Diatoms and biomarkers have been recently used for palaeoclimate reconstructions in the Southern Ocean. Few sediment-based ecological studies have investigated their relationships with environmental conditions. Here, we compare high-resolution sedimentary records with meteorological data to study relationships between our proxies and recent atmospheric and sea surface changes. Our results indicate that coupled wind pattern and sea surface variability act as the proximal forcing at that scale.
Carmen P. Vega, Veijo A. Pohjola, Emilie Beaudon, Björn Claremar, Ward J. J. van Pelt, Rickard Pettersson, Elisabeth Isaksson, Tõnu Martma, Margit Schwikowski, and Carl E. Bøggild
The Cryosphere, 10, 961–976, https://doi.org/10.5194/tc-10-961-2016, https://doi.org/10.5194/tc-10-961-2016, 2016
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To quantify post-depositional relocation of major ions by meltwater in snow and firn at Lomonosovfonna, Svalbard, consecutive ice cores drilled at this site were used to construct a synthetic core. The relocation length of most of the ions was on the order of 1 m between 2007 and 2010. Considering the ionic relocation lengths and annual melt percentages, we estimate that the atmospheric ionic signal remains preserved in recently drilled Lomonosovfonna ice cores at an annual or bi-annual resolution.
I. A. Wendl, A. Eichler, E. Isaksson, T. Martma, and M. Schwikowski
Atmos. Chem. Phys., 15, 7287–7300, https://doi.org/10.5194/acp-15-7287-2015, https://doi.org/10.5194/acp-15-7287-2015, 2015
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Nitrate and ammonium ice core records from Lomonosovfonna, Svalbard, indicated anthropogenic pollution from Eurasia as major source during the 20th century. In pre-industrial times nitrate is correlated with methane sulfonate, which we explain with a fertilising effect, presumably triggered by enhanced atmospheric nitrogen input to the ocean. Eurasia was likely the main source area also of pre-industrial nitrate, but for ammonium, biogenic emissions from Siberian boreal forests were dominant.
S. Altnau, E. Schlosser, E. Isaksson, and D. Divine
The Cryosphere, 9, 925–944, https://doi.org/10.5194/tc-9-925-2015, https://doi.org/10.5194/tc-9-925-2015, 2015
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The first comprehensive study of a set of 76 firn cores in Dronning Maud Land was carried out. The δ18O of both the plateau and the ice shelf cores exhibit a slight positive trend over the second half of the 20th century. The SMB has a negative trend in the ice shelf cores, but increases on the plateau. Comparison with meteorological data revealed that for the ice shelf regions, atmospheric dynamic effects are more important, while on the plateau, thermodynamic effects predominate.
M. M. Ruppel, E. Isaksson, J. Ström, E. Beaudon, J. Svensson, C. A. Pedersen, and A. Korhola
Atmos. Chem. Phys., 14, 11447–11460, https://doi.org/10.5194/acp-14-11447-2014, https://doi.org/10.5194/acp-14-11447-2014, 2014
A. Spolaor, P. Vallelonga, J. Gabrieli, T. Martma, M. P. Björkman, E. Isaksson, G. Cozzi, C. Turetta, H. A. Kjær, M. A. J. Curran, A. D. Moy, A. Schönhardt, A.-M. Blechschmidt, J. P. Burrows, J. M. C. Plane, and C. Barbante
Atmos. Chem. Phys., 14, 9613–9622, https://doi.org/10.5194/acp-14-9613-2014, https://doi.org/10.5194/acp-14-9613-2014, 2014
S. J. Gallagher, N. Exon, M. Seton, M. Ikehara, C. J. Hollis, R. Arculus, S. D'Hondt, C. Foster, M. Gurnis, J. P. Kennett, R. McKay, A. Malakoff, J. Mori, K. Takai, and L. Wallace
Sci. Dril., 17, 45–50, https://doi.org/10.5194/sd-17-45-2014, https://doi.org/10.5194/sd-17-45-2014, 2014
S. M. P. Berben, K. Husum, P. Cabedo-Sanz, and S. T. Belt
Clim. Past, 10, 181–198, https://doi.org/10.5194/cp-10-181-2014, https://doi.org/10.5194/cp-10-181-2014, 2014
D. E. Groot, S. Aagaard-Sørensen, and K. Husum
Clim. Past, 10, 51–62, https://doi.org/10.5194/cp-10-51-2014, https://doi.org/10.5194/cp-10-51-2014, 2014
A. Spolaor, J. Gabrieli, T. Martma, J. Kohler, M. B. Björkman, E. Isaksson, C. Varin, P. Vallelonga, J. M. C. Plane, and C. Barbante
The Cryosphere, 7, 1645–1658, https://doi.org/10.5194/tc-7-1645-2013, https://doi.org/10.5194/tc-7-1645-2013, 2013
C. V. Dylmer, J. Giraudeau, V. Hanquiez, and K. Husum
Biogeosciences Discuss., https://doi.org/10.5194/bgd-10-15077-2013, https://doi.org/10.5194/bgd-10-15077-2013, 2013
Revised manuscript has not been submitted
C. V. Dylmer, J. Giraudeau, F. Eynaud, K. Husum, and A. De Vernal
Clim. Past, 9, 1505–1518, https://doi.org/10.5194/cp-9-1505-2013, https://doi.org/10.5194/cp-9-1505-2013, 2013
J. Etourneau, L. G. Collins, V. Willmott, J.-H. Kim, L. Barbara, A. Leventer, S. Schouten, J. S. Sinninghe Damsté, A. Bianchini, V. Klein, X. Crosta, and G. Massé
Clim. Past, 9, 1431–1446, https://doi.org/10.5194/cp-9-1431-2013, https://doi.org/10.5194/cp-9-1431-2013, 2013
W. J. J. van Pelt, J. Oerlemans, C. H. Reijmer, R. Pettersson, V. A. Pohjola, E. Isaksson, and D. Divine
The Cryosphere, 7, 987–1006, https://doi.org/10.5194/tc-7-987-2013, https://doi.org/10.5194/tc-7-987-2013, 2013
P. Mathiot, H. Goosse, X. Crosta, B. Stenni, M. Braida, H. Renssen, C. J. Van Meerbeeck, V. Masson-Delmotte, A. Mairesse, and S. Dubinkina
Clim. Past, 9, 887–901, https://doi.org/10.5194/cp-9-887-2013, https://doi.org/10.5194/cp-9-887-2013, 2013
Related subject area
Subject: Ocean Dynamics | Archive: Marine Archives | Timescale: Holocene
Response of biological productivity to North Atlantic marine front migration during the Holocene
Surface and subsurface Labrador Shelf water mass conditions during the last 6000 years
Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay
Multiproxy evidence of the Neoglacial expansion of Atlantic Water to eastern Svalbard
Is there evidence for a 4.2 ka BP event in the northern North Atlantic region?
Holocene hydrography evolution in the Alboran Sea: a multi-record and multi-proxy comparison
Influence of the North Atlantic subpolar gyre circulation on the 4.2 ka BP event
The 4.2 ka event, ENSO, and coral reef development
Indian winter and summer monsoon strength over the 4.2 ka BP event in foraminifer isotope records from the Indus River delta in the Arabian Sea
Neoglacial climate anomalies and the Harappan metamorphosis
Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation
Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea
Post-glacial flooding of the Bering Land Bridge dated to 11 cal ka BP based on new geophysical and sediment records
Southern Hemisphere anticyclonic circulation drives oceanic and climatic conditions in late Holocene southernmost Africa
Holocene evolution of the North Atlantic subsurface transport
Changes in Holocene meridional circulation and poleward Atlantic flow: the Bay of Biscay as a nodal point
Hydrological variations of the intermediate water masses of the western Mediterranean Sea during the past 20 ka inferred from neodymium isotopic composition in foraminifera and cold-water corals
Sea surface temperature variability in the central-western Mediterranean Sea during the last 2700 years: a multi-proxy and multi-record approach
Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic
Late Weichselian and Holocene palaeoceanography of Storfjordrenna, southern Svalbard
Implication of methodological uncertainties for mid-Holocene sea surface temperature reconstructions
The role of the northward-directed (sub)surface limb of the Atlantic Meridional Overturning Circulation during the 8.2 ka event
Reconstruction of Atlantic water variability during the Holocene in the western Barents Sea
Northward advection of Atlantic water in the eastern Nordic Seas over the last 3000 yr
Controls of Caribbean surface hydrology during the mid- to late Holocene: insights from monthly resolved coral records
Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea
David J. Harning, Anne E. Jennings, Denizcan Köseoğlu, Simon T. Belt, Áslaug Geirsdóttir, and Julio Sepúlveda
Clim. Past, 17, 379–396, https://doi.org/10.5194/cp-17-379-2021, https://doi.org/10.5194/cp-17-379-2021, 2021
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Today, the waters north of Iceland are characterized by high productivity that supports a diverse food web. However, it is not known how this may change and impact Iceland's economy with future climate change. Therefore, we explored how the local productivity has changed in the past 8000 years through fossil and biogeochemical indicators preserved in Icelandic marine mud. We show that this productivity relies on the mixing of Atlantic and Arctic waters, which migrate north under warming.
Annalena A. Lochte, Ralph Schneider, Markus Kienast, Janne Repschläger, Thomas Blanz, Dieter Garbe-Schönberg, and Nils Andersen
Clim. Past, 16, 1127–1143, https://doi.org/10.5194/cp-16-1127-2020, https://doi.org/10.5194/cp-16-1127-2020, 2020
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The Labrador Sea is important for the modern global thermohaline circulation system through the formation of Labrador Sea Water. However, the role of the southward flowing Labrador Current in Labrador Sea convection is still debated. In order to better assess its role in deep-water formation and climate variability, we present high-resolution mid- to late Holocene records of sea surface and bottom water temperatures, freshening, and sea ice cover on the Labrador Shelf during the last 6000 years.
Katrine Elnegaard Hansen, Jacques Giraudeau, Lukas Wacker, Christof Pearce, and Marit-Solveig Seidenkrantz
Clim. Past, 16, 1075–1095, https://doi.org/10.5194/cp-16-1075-2020, https://doi.org/10.5194/cp-16-1075-2020, 2020
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In this study, we present RainNet, a deep convolutional neural network for radar-based precipitation nowcasting, which was trained to predict continuous precipitation intensities at a lead time of 5 min. RainNet significantly outperformed the benchmark models at all lead times up to 60 min. Yet an undesirable property of RainNet predictions is the level of spatial smoothing. Obviously, RainNet learned an optimal level of smoothing to produce a nowcast at 5 min lead time.
Joanna Pawłowska, Magdalena Łącka, Małgorzata Kucharska, Jan Pawlowski, and Marek Zajączkowski
Clim. Past, 16, 487–501, https://doi.org/10.5194/cp-16-487-2020, https://doi.org/10.5194/cp-16-487-2020, 2020
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Paleoceanographic changes in Storfjorden during the Neoglacial (the last
4000 years) were reconstructed based on microfossil and ancient DNA records. Environmental changes were steered mainly by the interaction between the inflow of Atlantic Water (AW) and sea ice cover. Warming periods were associated with AW inflow and sea ice melting, stimulating primary production. The cold phases were characterized by densely packed sea ice, resulting in limited productivity.
Raymond S. Bradley and Jostein Bakke
Clim. Past, 15, 1665–1676, https://doi.org/10.5194/cp-15-1665-2019, https://doi.org/10.5194/cp-15-1665-2019, 2019
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We review paleoceanographic and paleoclimatic records from the northern North Atlantic to assess the nature of climatic conditions at 4.2 ka BP. There was a general decline in temperatures after ~ 5 ka BP, which led to the onset of neoglaciation. Although a few records do show a distinct anomaly around 4.2 ka BP (associated with a glacial advance), this is not widespread and we interpret it as a local manifestation of the overall climatic deterioration that characterized the late Holocene.
Albert Català, Isabel Cacho, Jaime Frigola, Leopoldo D. Pena, and Fabrizio Lirer
Clim. Past, 15, 927–942, https://doi.org/10.5194/cp-15-927-2019, https://doi.org/10.5194/cp-15-927-2019, 2019
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We present a new high-resolution sea surface temperature (SST) reconstruction for the Holocene (last 11 700 years) in the westernmost Mediterranean Sea. We identify three sub-periods: the Early Holocene with warmest SST; the Middle Holocene with a cooling trend ending at 4200 years, which is identified as a double peak cooling event that marks the transition between the Middle and Late Holocene; and the Late Holocene with very different behaviour in both long- and short-term SST variability.
Bassem Jalali, Marie-Alexandrine Sicre, Julien Azuara, Violaine Pellichero, and Nathalie Combourieu-Nebout
Clim. Past, 15, 701–711, https://doi.org/10.5194/cp-15-701-2019, https://doi.org/10.5194/cp-15-701-2019, 2019
Lauren T. Toth and Richard B. Aronson
Clim. Past, 15, 105–119, https://doi.org/10.5194/cp-15-105-2019, https://doi.org/10.5194/cp-15-105-2019, 2019
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We explore the hypothesis that a shift in global climate 4200 years ago (the 4.2 ka event) was related to the El Niño–Southern Oscillation (ENSO). We summarize records of coral reef development in the tropical eastern Pacific, where intensification of ENSO stalled reef growth for 2500 years starting around 4.2 ka. Because corals are highly sensitive to climatic changes, like ENSO, we suggest that records from coral reefs may provide important clues about the role of ENSO in the 4.2 ka event.
Alena Giesche, Michael Staubwasser, Cameron A. Petrie, and David A. Hodell
Clim. Past, 15, 73–90, https://doi.org/10.5194/cp-15-73-2019, https://doi.org/10.5194/cp-15-73-2019, 2019
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A foraminifer oxygen isotope record from the northeastern Arabian Sea was used to reconstruct winter and summer monsoon strength from 5.4 to 3.0 ka. We found a 200-year period of strengthened winter monsoon (4.5–4.3 ka) that coincides with the earliest phase of the Mature Harappan period of the Indus Civilization, followed by weakened winter and summer monsoons by 4.1 ka. Aridity spanning both rainfall seasons at 4.1 ka may help to explain some of the observed archaeological shifts.
Liviu Giosan, William D. Orsi, Marco Coolen, Cornelia Wuchter, Ann G. Dunlea, Kaustubh Thirumalai, Samuel E. Munoz, Peter D. Clift, Jeffrey P. Donnelly, Valier Galy, and Dorian Q. Fuller
Clim. Past, 14, 1669–1686, https://doi.org/10.5194/cp-14-1669-2018, https://doi.org/10.5194/cp-14-1669-2018, 2018
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Climate reorganization during the early neoglacial anomaly (ENA) may explain the Harappan civilization metamorphosis from an urban, expansive culture to a rural, geographically-confined one. Landcover change is a candidate for causing this climate instability. During ENA agriculture along the flood-deficient floodplains of the Indus became too risky, which pushed people out. In the same time the Himalayan piedmont received augmented winter rain and steady summer precipitation, pulling people in.
Martin Bartels, Jürgen Titschack, Kirsten Fahl, Rüdiger Stein, Marit-Solveig Seidenkrantz, Claude Hillaire-Marcel, and Dierk Hebbeln
Clim. Past, 13, 1717–1749, https://doi.org/10.5194/cp-13-1717-2017, https://doi.org/10.5194/cp-13-1717-2017, 2017
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Multi-proxy analyses (i.a., benthic foraminiferal assemblages and sedimentary properties) of a marine record from Woodfjorden at the northern Svalbard margin (Norwegian Arctic) illustrate a significant contribution of relatively warm Atlantic water to the destabilization of tidewater glaciers, especially during the deglaciation and early Holocene (until ~ 7800 years ago), whereas its influence on glacier activity has been fading during the last 2 millennia, enabling glacier readvances.
Masanobu Yamamoto, Seung-Il Nam, Leonid Polyak, Daisuke Kobayashi, Kenta Suzuki, Tomohisa Irino, and Koji Shimada
Clim. Past, 13, 1111–1127, https://doi.org/10.5194/cp-13-1111-2017, https://doi.org/10.5194/cp-13-1111-2017, 2017
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Based on mineral records from the northern Chukchi Sea, we report a long-term decline in the Beaufort Gyre (BG) strength during the Holocene, consistent with a decrease in summer insolation. Multi-centennial variability in BG circulation is consistent with fluctuations in solar irradiance. The Bering Strait inflow shows intensification during the middle Holocene, associated with sea-ice retreat and an increase in marine production in the Chukchi Sea, which is attributed to a weaker Aleutian Low.
Martin Jakobsson, Christof Pearce, Thomas M. Cronin, Jan Backman, Leif G. Anderson, Natalia Barrientos, Göran Björk, Helen Coxall, Agatha de Boer, Larry A. Mayer, Carl-Magnus Mörth, Johan Nilsson, Jayne E. Rattray, Christian Stranne, Igor Semiletov, and Matt O'Regan
Clim. Past, 13, 991–1005, https://doi.org/10.5194/cp-13-991-2017, https://doi.org/10.5194/cp-13-991-2017, 2017
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The Arctic and Pacific oceans are connected by the presently ~53 m deep Bering Strait. During the last glacial period when the sea level was lower than today, the Bering Strait was exposed. Humans and animals could then migrate between Asia and North America across the formed land bridge. From analyses of sediment cores and geophysical mapping data from Herald Canyon north of the Bering Strait, we show that the land bridge was flooded about 11 000 years ago.
Annette Hahn, Enno Schefuß, Sergio Andò, Hayley C. Cawthra, Peter Frenzel, Martin Kugel, Stephanie Meschner, Gesine Mollenhauer, and Matthias Zabel
Clim. Past, 13, 649–665, https://doi.org/10.5194/cp-13-649-2017, https://doi.org/10.5194/cp-13-649-2017, 2017
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Our study demonstrates that a source to sink analysis in the Gouritz catchment can be used to obtain valuable paleoclimatic information form the year-round rainfall zone. In combination with SST reconstructions these data are a valuable contribution to the discussion of Southern Hemisphere palaeoenvironments and climate variability (in particular atmosphere–ocean circulation and hydroclimate change) in the South African Holocene.
Janne Repschläger, Dieter Garbe-Schönberg, Mara Weinelt, and Ralph Schneider
Clim. Past, 13, 333–344, https://doi.org/10.5194/cp-13-333-2017, https://doi.org/10.5194/cp-13-333-2017, 2017
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We reconstruct changes in the warm water transport from the subtropical to the subpolar North Atlantic over the last 10 000 years. We use stable isotope and Mg / Ca ratios measured on surface and subsurface dwelling foraminifera. Results indicate an overall stable warm water transport at surface. The northward transport at subsurface evolves stepwise and stabilizes at 7 ka BP on the modern mode. These ocean transport changes seem to be controlled by the meltwater inflow into the North Atlantic.
Yannick Mary, Frédérique Eynaud, Christophe Colin, Linda Rossignol, Sandra Brocheray, Meryem Mojtahid, Jennifer Garcia, Marion Peral, Hélène Howa, Sébastien Zaragosi, and Michel Cremer
Clim. Past, 13, 201–216, https://doi.org/10.5194/cp-13-201-2017, https://doi.org/10.5194/cp-13-201-2017, 2017
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In the boreal Atlantic, the subpolar and subtropical gyres (SPG and STG respectively) are key elements of the Atlantic Meridional Overturning Circulation (AMOC) cell and contribute to climate modulations over Europe. Here we document the last 10 kyr evolution of sea-surface temperatures over the North Atlantic with a focus on new data obtained from an exceptional sedimentary archive retrieved the southern Bay of Biscay, enabling the study of Holocene archives at (infra)centennial scales.
Quentin Dubois-Dauphin, Paolo Montagna, Giuseppe Siani, Eric Douville, Claudia Wienberg, Dierk Hebbeln, Zhifei Liu, Nejib Kallel, Arnaud Dapoigny, Marie Revel, Edwige Pons-Branchu, Marco Taviani, and Christophe Colin
Clim. Past, 13, 17–37, https://doi.org/10.5194/cp-13-17-2017, https://doi.org/10.5194/cp-13-17-2017, 2017
Mercè Cisneros, Isabel Cacho, Jaime Frigola, Miquel Canals, Pere Masqué, Belen Martrat, Marta Casado, Joan O. Grimalt, Leopoldo D. Pena, Giulia Margaritelli, and Fabrizio Lirer
Clim. Past, 12, 849–869, https://doi.org/10.5194/cp-12-849-2016, https://doi.org/10.5194/cp-12-849-2016, 2016
Short summary
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We present a high-resolution multi-proxy study about the evolution of sea surface conditions along the last 2700 yr in the north-western Mediterranean Sea based on five sediment records from two different sites north of Minorca. The novelty of the results and the followed approach, constructing stack records from the studied proxies to preserve the most robust patterns, provides a special value to the study. This complex period appears to have significant regional changes in the climatic signal.
C. Consolaro, T. L. Rasmussen, G. Panieri, J. Mienert, S. Bünz, and K. Sztybor
Clim. Past, 11, 669–685, https://doi.org/10.5194/cp-11-669-2015, https://doi.org/10.5194/cp-11-669-2015, 2015
Short summary
Short summary
A sediment core collected from a pockmark field on the Vestnesa Ridge (~80N) in the Fram Strait is presented. Our results show an undisturbed sedimentary record for the last 14 ka BP and negative carbon isotope excursions (CIEs) during the Bølling-Allerød interstadials and during the early Holocene. Both CIEs relate to periods of ocean warming, sea-level rise and increased concentrations of methane (CH4) in the atmosphere, suggesting an apparent correlation with warm climatic events.
M. Łącka, M. Zajączkowski, M. Forwick, and W. Szczuciński
Clim. Past, 11, 587–603, https://doi.org/10.5194/cp-11-587-2015, https://doi.org/10.5194/cp-11-587-2015, 2015
Short summary
Short summary
Storfjordrenna was deglaciated about 13,950 cal yr BP. During the transition from the sub-glacial to glaciomarine setting, Arctic Waters dominated its hydrography. However, the waters were not uniformly cold and experienced several warmer spells. Atlantic Water began to flow onto the shelves off Svalbard and into Storfjorden during the early Holocene, leading to progressive warming and significant glacial melting. A surface-water cooling and freshening occurred in late Holocene.
I. Hessler, S. P. Harrison, M. Kucera, C. Waelbroeck, M.-T. Chen, C. Anderson, A. de Vernal, B. Fréchette, A. Cloke-Hayes, G. Leduc, and L. Londeix
Clim. Past, 10, 2237–2252, https://doi.org/10.5194/cp-10-2237-2014, https://doi.org/10.5194/cp-10-2237-2014, 2014
A. D. Tegzes, E. Jansen, and R. J. Telford
Clim. Past, 10, 1887–1904, https://doi.org/10.5194/cp-10-1887-2014, https://doi.org/10.5194/cp-10-1887-2014, 2014
D. E. Groot, S. Aagaard-Sørensen, and K. Husum
Clim. Past, 10, 51–62, https://doi.org/10.5194/cp-10-51-2014, https://doi.org/10.5194/cp-10-51-2014, 2014
C. V. Dylmer, J. Giraudeau, F. Eynaud, K. Husum, and A. De Vernal
Clim. Past, 9, 1505–1518, https://doi.org/10.5194/cp-9-1505-2013, https://doi.org/10.5194/cp-9-1505-2013, 2013
C. Giry, T. Felis, M. Kölling, W. Wei, G. Lohmann, and S. Scheffers
Clim. Past, 9, 841–858, https://doi.org/10.5194/cp-9-841-2013, https://doi.org/10.5194/cp-9-841-2013, 2013
G. Siani, M. Magny, M. Paterne, M. Debret, and M. Fontugne
Clim. Past, 9, 499–515, https://doi.org/10.5194/cp-9-499-2013, https://doi.org/10.5194/cp-9-499-2013, 2013
Cited articles
Alley, R. B. and Ágústsdóttir, A. M.: The 8k event: Cause and
consequences of a major Holocene abrupt climate change, Quaternary Sci. Rev.,
24, 1123–1149, https://doi.org/10.1016/j.quascirev.2004.12.004, 2005.
Anderson, R. F., Ali, S., Bradtmiller, L. I., Nielsen, S. H. H., Fleisher,
M. Q., Anderson, B. E., and Burckle, L. H.: Wind-driven upwelling in the
southern ocean and the deglacial rise in atmospheric CO2, Science,
323, 1443–1448, https://doi.org/10.1126/science.1167441, 2009.
Anilkumar, N., Luis, A. J., Somayajulu, Y. K., Babu, V. R., Dash, M. K.,
Pednekar, S. M., Babu, K. N., Sudhakar, M., and Pandey, P. C.: Fronts, water
masses and heat content variability in the Western Indian sector of the
Southern Ocean during austral summer 2004, J. Marine Syst., 63, 20–34,
https://doi.org/10.1016/j.jmarsys.2006.04.009, 2006.
Ansorge, I. J., Roman, R., Durgadoo, J. V., Ryan, P. G., Dlamini, L.,
Gebhardt, Z., Rainier, S., Smith, M., Mtonsti, T., and Lutjeharms, J. R. E.:
The first oceanographic survey of the Conrad Rise, S. Afr. J. Sci.,
104, 333–336, 2008.
Armand, L. K., Crosta, X., Romero, O., and Pichon, J.-J.: The Biogeography of
Major Diatom Taxa in Southern Ocean Sediments: 1. Sea Ice Related Species, Palaeogeogr. Palaeocl., 223, 93-126,
https://doi.org/10.1016/j.palaeo.2005.03.028, 2005.
Armand, L. K., Cornet-Barthaux, V., Mosseri, J., and Quéguiner, B.: Late
summer diatom biomass and community structure on and around the naturally
iron-fertilised Kerguelen Plateau in the Southern Ocean, Deep Sea Res. II,
55, 653–676, https://doi.org/10.1016/j.dsr2.2007.12.031, 2008a.
Armand, L. K., Crosta, X., Quéguiner, B., Mosseri, J., and Garcia, N.:
Diatoms preserved in surface sediments of the northeastern Kerguelen
Plateau, Deep Sea Res. II, 55, 677–692, https://doi.org/10.1016/j.dsr2.2007.12.032,
2008b.
Bárcena, M. A., Gersonde, R., Ledesma, S., Fabrés, J., Calafat, A.
M., Canals, M., Sierro, F. J., and Flores, J. A.: Record of Holocene glacial
oscillations in Bransfield Basin as revealed by siliceous microfossil
assemblages, Antarct. Sci., 10, 269–285, https://doi.org/10.1017/S0954102098000364,
1998.
Bard, E.: Correction of accelerator mass spectrometry 14C ages measured in planktonic foraminifera: paleoceanographic implications, Paleoceanogr. Paleocl., 3, 635–645, 1988.
Barker, S., Vautravers, M. J., Pike, J., Hall, I. R., Broecker, W. S., Diz,
P., and Knorr, G.: Interhemispheric Atlantic seesaw response during the last
deglaciation, Nature, 457, 1097–1102, https://doi.org/10.1038/nature07770, 2009.
Bendat, J. S. and Piersol, A. G.: Decomposition of wave forces into linear
and non-linear components, J. Sound Vib., 106, 391–408,
https://doi.org/10.1016/0022-460X(86)90186-0, 1986.
Bianchi, C. and Gersonde, R.: Climate evolution at the last deglaciation:
The role of the Southern Ocean, Earth Planet. Sci. Lett., 228,
407–424, https://doi.org/10.1016/j.epsl.2004.10.003, 2004.
Blaauw, M. and Christen, J. A.: Flexible paleoclimate age-depth models using
an autoregressive gamma process, Bayesian Anal., 6, 457–474,
https://doi.org/10.1214/11-BA618, 2011.
Broecker, W. S.: Paleocean circulation during the last deglaciation: a
bipolar seesaw?, Paleoceanogr., 13, 119–121, https://doi.org/10.1029/97PA03707, 1998.
Butzin, M., Prange, M., and Lohmann, G.: Radiocarbon simulations for the
glacial ocean: the effects of wind stress, Southern Ocean sea ice and
Heinrich events, Earth Planet. Sci. Lett., 235, 45–61,
https://doi.org/10.1016/j.epsl.2005.03.003, 2005.
Chaudhuri, P. and Marron, J. S.: SiZer for exploration of structures in
curves, J. Am. Stat. Assoc., 94, 807–823, https://doi.org/10.2307/2669996, 1999.
Cárdenas, P., Lange, C. B., Vernet, M., Esper, O., Srain, B., Vorrath,
M.-E., Ehrhardt, S., Müller, J., Kuhn, G., Arz, H. W., Lembke-Jene, L., and Lamy, F.: Biogeochemical proxies and diatoms in surface sediments across
the Drake Passage reflect oceanic domains and frontal systems in the region,
Prog. Oceano., 174, 72–88, https://doi.org/10.1016/j.pocean.2018.10.004, 2019.
Clark, P. U., Shakun, J. D., Baker, P. A., Bartlein, P. J., Brewer, S.,
Brook, E., Carlson, A. E., Cheng, H., Kaufman, D. S., Liu, Z., Marchitto, T.
M., Mix, A. C., Morrill, C., Otto-Bliesner, B. L., Pahnke, K., Russell, J.
M., Whitlock, C., Adkins, J. F., Blois, J. L., Clark, J., Colman, S. M.,
Curry, W. B., Flower, B. P., He, F., Johnson, T. C., Lynch-Stieglitz, J.,
Markgraf, V., McManus, J., Mitrovica, J. X., Moreno, P. I., and Williams, J.
W.: Global climate evolution during the last deglaciation, P. Natl. Acad.
Sci. USA, 109, E1134–E1142, https://doi.org/10.1073/pnas.1116619109, 2012.
Crosta, X. and Koç, N.: Chapter eight diatoms: From micropaleontology to
isotope geochemistry, Develop. Mar. Geol., 1, 327–369,
https://doi.org/10.1016/S1572-5480(07)01013-5, 2007.
Crosta, X., Sturm, A., Armand, L., and Pichon, J. J.: Late Quaternary sea ice
history in the Indian sector of the Southern Ocean as recorded by diatom
assemblages, Mar. Micropaleontol., 50, 209–223,
https://doi.org/10.1016/S0377-8398(03)00072-0, 2004.
Crosta, X., Romero, O., Armand, L. K., and Pichon, J.-J.: The Biogeography of
Major Diatom Taxa in Southern Ocean Sediments: 2. Open Ocean Related
Species, Palaeogeogr. Palaeocl., 223, 66–92,
https://doi.org/10.1016/j.palaeo.2005.03.028, 2005.
Crosta, X., Debret, M., Denis, D., Courty, M. A., and Ther, O.: Holocene
long- and short-term climate changes off Adélie Land, East Antarctica,
Geochem., Geophys., Geosyst., 8, Q11009, https://doi.org/10.1029/2007GC001718, 2007.
Crosta, X., Shukla, S. K., Ther, O., Ikehara, M., Yamane, M., and Yokoyama,
Y.: Last Abundant Appearance Datum of Hemidiscus Karstenii Driven by Climate
Change, Mar. Micropaleontol, 157, 10186, https://doi.org/10.1016/j.marmicro.2020.101861,
2020.
Debret, M., Sebag, D., Crosta, X., Massei, N., Petit, J. R., Chapron, E., and
Bout-Roumazeilles, V.: Evidence from wavelet analysis for a mid-Holocene
transition in global climate forcing, Quaternary Sci. Rev., 28,
2675–2688, https://doi.org/10.1016/j.quascirev.2009.06.005, 2009.
Denton, G. H., Anderson, R. F., Toggweiler, J. R., Edwards, R. L., Schaefer,
J. M., and Putnam, A. E.: The Last Glacial Termination, Science, 328,
1652 LP-1656, https://doi.org/10.1126/science.1184119, 2010.
Dezileau, L., Bareille, G., and Reyss, J. L.: The 231Pa/230Th ratio as a
proxy for past changes in opal fluxes in the Indian sector of the Southern
Ocean, Mar. Chem., 81, 105–117, https://doi.org/10.1016/S0304-4203(02)00070-1,
2003.
Diekmann, B.: Sedimentary Patterns in the Late Quaternary Southern Ocean,
Deep Sea Res Part II, 54, 2350–2366, https://doi.org/10.1016/j.dsr2.2007.07.025,
2007.
Divine, D. V., Koç, N., Isaksson, E., Nielsen, S., Crosta, X., and
Godtliebsen, F.: Holocene Antarctic climate variability from ice and marine
sediment cores: Insights on ocean-atmosphere interaction, Quaternary Sci. Rev.,
29, 303–312, https://doi.org/10.1016/j.quascirev.2009.11.012, 2010.
Ellison, C. R. W., Chapman, M. R., and Hall, I. R.: Surface and deep ocean
interactions during the cold climate event 8200 years ago, Science,
312, 1929–1932, https://doi.org/10.1126/science.1127213, 2006.
EPICA Community Members: One-to-one coupling of glacial climate variability
in Greenland and Antarctica, Nature, 444, 195–198, https://doi.org/10.1038/nature05301,
2006.
Esper, O. and Gersonde, R.: Quaternary Surface Water Temperature
Estimations: New Diatom Transfer Functions for the Southern Ocean, Palaeogeogr. Palaeocl., 414, 1–19, https://doi.org/10.1016/j.palaeo.2014.08.008, 2014.
Esper, O., Gersonde, R., and Kadagies, N.: Diatom Distribution in
Southeastern Pacific Surface Sediments and Their Relationship to Modern
Environmental Variables, Palaeogeogr. Palaeocl., 287,
1–27, https://doi.org/10.1016/j.palaeo.2009.12.006, 2010.
Etourneau, J., Collins, L. G., Willmott, V., Kim, J.-H., Barbara, L., Leventer, A., Schouten, S., Sinninghe Damsté, J. S., Bianchini, A., Klein, V., Crosta, X., and Massé, G.: Holocene climate variations in the western Antarctic Peninsula: evidence for sea ice extent predominantly controlled by changes in insolation and ENSO variability, Clim. Past, 9, 1431–1446, https://doi.org/10.5194/cp-9-1431-2013, 2013.
Etourneau, J., Sgubin, G., Crosta, X., Swingedouw, D., Willmott, V.,
Barbara, L., Houssais, M-N, Schouten, S., Damsté, J. S. S., Goosse, H.,
Escutia, C., Crespin, J., Massé, G., and Kim, J.-H.: Ocean Temperature
Impact on Ice Shelf Extent in the Eastern Antarctic Peninsula, Nat. Comm.,
10, 1431–1446, https://doi.org/10.1038/s41467-018-08195-6, 2019.
Fischer, H., Fundel, F., Ruth, U., Twarloh, B., Wegner, A., Udisti, R.,
Becagli, S., Castellano, E., Morganti, A., Severi, M., Wolff, E., Littot,
G., Röthlisberger, R., Mulvaney, R., Hutterli, M. A., Kaufmann, P.,
Federer, U., Lambert, F., Bigler, M., Hansson, M., Jonsell, U., de Angelis,
M., Boutron, C., Siggaard-Andersen, M.-L., Steffensen, J. P., Barbante, C.,
Gaspari, V., Gabrielli, P., and Wagenbach,, D.: Reconstruction of millennial
changes in dust emission, transport and regional sea ice coverage using the
deep EPICA ice cores from the Atlantic and Indian Ocean sector of
Antarctica, Earth Planet. Sc. Lett., 260, 340–354,
https://doi.org/10.1016/j.epsl.2007.06.014, 2007.
Fletcher, M. S. and Moreno, P. I.: Zonally symmetric changes in the strength
and position of the Southern Westerlies drove atmospheric CO2
variations over the past 14 k.y, Geology, 39, 419–422,
https://doi.org/10.1130/G31807.1, 2011.
Gersonde, R. and Zielinski, U.: The reconstruction of Late Quaternary
Antarctic sea-ice distribution – the use of diatoms as a proxy for sea ice, Palaeogeogr. Palaeocl., 162, 263–286, 2000.
Graham, R. M., De Boer, A. M., Heywood, K. J., Chapman, M. R., and Stevens,
D. P.: Southern Ocean fronts: Controlled by wind or topography? J. Geophys.
Res.-Oceans, 117, C08018, https://doi.org/10.1029/2012JC007887, 2012.
Guiot, J. and de Vernal, A.: Is spatial autocorrelation introducing biases
in the apparent accuracy of paleoclimatic reconstructions?, Quaternary Sci. Rev.,
30, 1965–1972, https://doi.org/10.1016/j.quascirev.2011.04.022, 2011.
Guiot, J., de Beaulieu, J. L., Cheddadi, R., David, F., Ponel, P., and
Reille, M.: The climate in Western Europe during the last
Glacial/Interglacial cycle derived from pollen and insect remains, Palaeogeogr. Palaeocl., 103, 73–93,
https://doi.org/10.1016/0031-0182(93)90053-L, 1993.
Haddam, N. A., Siani, G., Michel, E., Kaiser, J., Lamy, F.,
Duchamp-Alphonse, S., Hefter, J., Braconnot, P., Dewilde, F., Isgüder,
G., Tisnerat-Laborde, N., Thil, F., Durand, N., and Kissel, C.: Changes in
latitudinal sea surface temperature gradients along the Southern Chilean
margin since the last glacial, Quaternary Sci. Rev., 194, 62–76,
https://doi.org/10.1016/j.quascirev.2018.06.023, 2018.
Hall, A. and Visbeck, M.: Synchronous Variability in the Southern Hemisphere
Atmosphere, Sea Ice, and Ocean Resulting from the Annular Mode, J. Climate,
15, 3043–3057, https://doi.org/10.1175/1520-0442(2002)015<3043:SVITSH>2.0.CO;2, 2002.
Hall, B. L., Henderson, G. M., Baroni, C., and Kellogg, T. B.: Constant
Holocene Southern-Ocean 14C Reservoir Ages and Ice-Shelf Flow Rates, Earth
Planet. Sci. Lett., 296, 115–123, https://doi.org/10.1016/j.epsl.2010.04.054,
2010.
Hammer, Ø., Harper, D. A. T., and Ryan, P. D.: PAST: paleontological
statistics software package for education and data analysis, Palaeontologia
Electronica, 4, 4, available at: https://palaeo-electronica.org/2001_1/past/past.pdf (last access: 6 August 2020), 2001.
Hughen, K. A., Overpeck, J. T., Peterson, L. C., and Trumbore, S.: Rapid
climate changes in the tropical Atlantic region during the last
deglaciation, Nature, 380, 51–54, https://doi.org/10.1038/380051a0, 1996.
Iizuka, Y., Hondoh, T., and Fujii, Y.: Antarctic sea ice extent during the
Holocene reconstructed from inland ice core evidence, J. Geophys.
Res.-Atmos., 113, 1–8, https://doi.org/10.1029/2007JD009326, 2008.
Jouzel, J., Masson-Delmotte, V., Cattani, O., Dreyfus, G., Falourd, S.,
Hoffmann, G., Minster, B., Nouet, J., Barnola, J. M., Chappellaz, J.,
Fischer, H., Gallet, J. C., Johnsen, S., Leuenberger, M., Loulergue, L.,
Luethi, D., Oerter, H., Parrenin, F., Raisbeck, G., Raynaud, D., Schilt, A.,
Schwander, J., Selmo, E., Souchez, R., Spahni, R., Stauffer, B., Steffensen,
J. P., Stenni, B., Stocker, T. F., Tison, J. L., Werner, M., and Wolff, E.
W.: Orbital and millennial Antarctic climate variability over the past
800,000 years, Science, 317, 793–796, https://doi.org/10.1126/science.1141038,
2007.
Katsuki, K., Ikehara, M., Yokoyama, Y., Yamane, M., and Khim, B. K.: Holocene
migration of oceanic front systems over the Conrad Rise in the Indian Sector
of the Southern Ocean, J. Quaternary Sci., 27, 203–210, https://doi.org/10.1002/jqs.1535, 2012.
Kuroda, Y.: On the Origin of the Solar Cycle Modulation of the Southern
Annular Mode, J. Geophys. Res.-Atmos., 123, 1959–1969,
https://doi.org/10.1002/2017JD027091, 2018.
Kuroda, Y. and Kodera, K.: Solar Cycle Modulation of the Southern Annular
Mode, Geophys. Res. Lett., 32, L13802, https://doi.org/10.1029/2005GL022516, 2005.
Lamy, F., Hebbeln, D., Röhl, U., and Wefer, G.: Holocene rainfall
variability in southern Chile: a marine record of latitudinal shifts of the
Southern Westerlies, Earth Planet. Sci. Lett., 185, 369–382,
https://doi.org/10.1016/S0012-821X(00)00381-2, 2001.
Lamy, F., Kilian, R., Arz, H. W., Francois, J.-P., Kaiser, J., Prange, M., and Steinke, T.: Holocene changes in the position and intensity of the southern westerly wind belt, Nat. Geosci., 3, 695–699, 2010.
Laskar, J., Robutel, P., Joutel, F., Gastineau, M., Correia, A., C., M., and
Levrard, B.: A Long-Term Numerical Solution for the Insolation Quantities of
the Earth, Astron. Astrophys., 428, 261–85,
https://doi.org/10.1051/0004-6361:20041335, 2004.
Latif, M., Martin, T., and Park, W.: Southern Ocean sector centennial climate
variability and recent decadal trends, J. Climate, 26, 7767–7782,
https://doi.org/10.1175/JCLI-D-12-00281.1, 2013.
Leventer, A., Domack, E. W., Ishman, S. E., Brachfeld, S., McClennen, C. E., and Manley, P.: Productivity cycles of 200–300 years in the Antarctic
Peninsula region: understanding linkages among the sun, atmosphere, oceans,
sea ice, and biota, Geol. Soc. Am. Bulletin, 108, 1626–1644,
https://doi.org/10.1130/0016-7606(1996)108<1626:PCOYIT>2.3.CO;2, 1996.
Levermann, A., Schewe, J., and Montoya, M.: Lack of bipolar see-saw in
response to Southern Ocean wind reduction, Geophys. Res. Lett., 34,
1–5, https://doi.org/10.1029/2007GL030255, 2007.
Locarnini, R. A., Mishonov, A. V, Antonov, J. I., Boyer, T. P., Garcia, H.
E., Baranova, O. K., Zweng, C. R., Paver, J. R., Reagan, D. R., Johnson, D.
R., Hamilton, M., and Seidov, D.: World ocean atlas 2013. Volume 1,
Temperature, edited by: Levitus, S. and Mishonov, A., NOAA Atlas NESDIS 73, Washington, DC, USA, 40 pp., 2013.
Lovenduski, N. S. and Gruber, N.: Impact of the Southern Annular Mode on
Southern Ocean circulation and biology, Geophys. Res. Lett., 32, 1–4,
https://doi.org/10.1029/2005GL022727, 2005.
Mayewski, P.A., Maasch, K.A., Dixon, D., Sneed, S.B., Oglesby, R.,
Korotkikh, E., Potocki, M., Grigholm, B., Kreutz, K., Kurbatov, A.V., and
Spaulding, N.: West Antarctica's sensitivity to natural and human-forced
climate change over the Holocene, J. Quaternary Sci., 28, 40–48,
https://doi.org/10.1002/jqs.2593, 2013.
McManus, J. F., Francois, R., Gherardi, J.-M., Keigwin, L. D., and
Brown-Leger, S.: Collapse and rapid resumption of Atlantic meridional
circulation linked to deglacial climate changes, Nature, 428, 834–837,
https://doi.org/10.1038/nature02494, 2004.
Meredith, M. P. and Hogg, A. M.: Circumpolar response of Southern Ocean eddy
activity to a change in the Southern Annular Mode, Geophys. Res. Lett.,
33, 2–5, https://doi.org/10.1029/2006GL026499, 2006.
Monnin, E., Indermühle, A., Dällenbach, A., Flückiger, J.,
Stauffer, B., Stocker, T. F., Raynaud, D., and Barnola, J.-M.: Atmospheric
CO2 Concentrations over the Last Glacial Termination, Science,
291, 112 LP-114, https://doi.org/10.1126/science.291.5501.112, 2001.
Moreno, P. I., Vilanova, I., Villa-Martínez, R., Garreaud, R. D.,
Rojas, M., and De Pol-Holz, R.: Southern annular mode-like changes in
southwestern Patagonia at centennial timescales over the last three
millennia, Nat. Commun., 5, 4375, https://doi.org/10.1038/ncomms5375, 2014.
Nielsen, S. H. H., Koç, N., and Crosta, X.: Holocene climate in the
Atlantic sector of the Southern Ocean: Controlled by insolation or oceanic
circulation?, Geology, 32, 317–320, https://doi.org/10.1130/G20334.1, 2004.
Oiwane, H., Ikehara, M., Suganuma, Y., Miura, H., Nakamura, Y., Sato, T.,
Nogi, Y., Yamane, M., and Yokoyama, Y.: Sediment Waves on the Conrad Rise ,
Southern Indian Ocean?: Implications for the Migration History of the
Antarctic Circumpolar Current, Mar. Geol., 348, 27–36,
https://doi.org/10.1016/j.margeo.2013.10.008, 2014.
Orme, L. C., Crosta, X., Miettinen, A., Divine, D., Husum, K., Isaksson, E., Wacker, L., Mohan, R., Ther, O., and Ikehara, M.: Diatom percentage abundances for sediment core KH-10-7 COR1GC from the Conrad Rise, Southern Ocean, PANGAEA, https://doi.org/10.1594/PANGAEA.913620, 2020a.
Orme, L. C., Crosta, X., Miettinen, A., Divine, D., Husum, K., Isaksson, E., Wacker, L., Mohan, R., Ther, O., and Ikehara, M.: Sea surface temperature reconstruction for sediment core KH-10-7 COR1GC from the Conrad Rise, Southern Ocean, PANGAEA, https://doi.org/10.1594/PANGAEA.913621, 2020b.
Orsi, A. H., Whitworth III, T., and Nowlin Jr, W. D.: On the meridional
extent and fronts of the Antarctic Circumpolar Current, Deep Sea Res. Part
I, 42, 641–673, https://doi.org/10.1016/0967-0637(95)00021-W, 1995.
Park, Y.-H., Charriaud, E., and Fieux, M.: Thermohaline structure of the Antarctic Surface Water/Winter Water
in the Indian sector of the Southern Ocean, J. Mar. Syst., 17, 5–23,
https://doi.org/10.1016/S0924-7963(98)00026-8, 1998.
Parkinson, C. L.: A 40-y record reveals gradual Antarctic sea ice increases
followed by decreases at rates far exceeding the rates seen in the Arctic,
Proc. Nat. Am. Soc., 116, 14414–14423, 2019.
Parkinson, C. L. and Cavalieri, D. J.: Antarctic sea ice variability and trends, 1979–2010, The Cryosphere, 6, 871–880, https://doi.org/10.5194/tc-6-871-2012, 2012.
Parrenin, F., Masson-Delmotte, V., Köhler, P., Raynaud, D., Paillard,
D., Schwander, J., Barbante, C., Landais, A., Wegner, A., and Jouzel, J.:
Synchronous change of atmospheric CO2 and Antarctic temperature during
the last deglacial warming, Science, 339, 1060–1063, https://doi.org/10.1126/science.1226368, 2013.
Past Interglacials Working Group: Interglacials of the Last 800,000 Years, Rev. Geophys., 54, 162–219, https://doi.org/10.1002/2015RG000482, 2016.
Pauthenet, E., Roquet, F., Madec, G., Guinet, C., Hindell, M., McMahon, C.
R., Harcourt, R., and Nerini, D.: Seasonal meandering of the Polar Front
upstream of the Kerguelen Plateau, Geophys. Res. Lett., 45, 9774–9781,
https://doi.org/10.1029/2018GL079614, 2018.
Pedro, J. B., Bostock, H., C., Bitz, C., M., He, F., Vandergoes, M., J.,
Steig, E., J., Chase, B., M., Krause, C., E., Rasmussen, S., O., Markle, B.,
R., and Cortese, G.: The Spatial Extent and Dynamics of the Antarctic Cold
Reversal, Nat. Geosci., 9, 51–55, https://doi.org/10.1038/NGEO2580, 2015.
Pedro, J. B., Jochum, M., Buizert, C., He, F., Barker, S., and Rasmussen, S.
O.: Beyond the bipolar seesaw?: Toward a process understanding of
interhemispheric coupling, Quaternary Sci. Rev., 192, 27–46,
https://doi.org/10.1016/j.quascirev.2018.05.005, 2018.
Pichon, J.-J., Bareille, G., Labracherie, M., Labeyrie, L., D., Baudrimont,
A., and Turon, J.-L.: Quantification of the Biogenic Silica Dissolution in
Southern Ocean Sediments, Quaternary Res., 37, 361–378,
https://doi.org/10.1016/0033-5894(92)90073-R, 1992.
Pollard, R. T. and Read, J. F.: Circulation pathways and transports of the
Southern Ocean in the vicinity of the Southwest Indian Ridge, J. Geophys.
Res.-Oceans, 106, 2881–2898, https://doi.org/10.1029/2000JC900090, 2001.
Rasmussen, S., O., Bigler, M., Blockley, S., P., Blunier, T., Buchardt, S.,
L., Clausen, H., B., Cvijanovic, I., Dahl-Jensen, D., Johnsen, S., J., and
Fischer, H.: 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, 2014.
Reimer, P. J., Bard, E., Bayliss, A., Beck, J. W., Blackwell, P. G., Ramsey,
C. B., 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.
Renssen, H., Goosse, H., Crosta, X., and Roche, D. M.: Early Holocene
aurentide ice sheet deglaciation causes cooling in the high-latitude
southern hemisphere through oceanic teleconnection, Paleoceanography, 25,
1–15, https://doi.org/10.1029/2009PA001854, 2010.
Romero, O., E, Armand, L., K., Crosta, X., and Pichon, J-J.: The Biogeography
of Major Diatom Taxa in Southern Ocean Surface Sediments: 3.
Tropical/Subtropical Species, Palaeogeogr. Palaeocl.,
223, 49–65, https://doi.org/10.1016/j.palaeo.2005.03.028, 2005.
Romero, O., E., Crosta, X., Kim, J.-H., Pichevin, L., and Crespin, J.: Rapid
Longitudinal Migrations of the Filament Front off Namibia (SE Atlantic)
during the Past 70 kyr, Global Planet. Change, 125, 1–12,
https://doi.org/10.1016/j.gloplacha.2014.12.001, 2015.
Saunders, K. M., Roberts, S. J., Perren, B., Butz, C., Sime, L., Davies, S.,
Van Nieuwenhuyze, W., Grosjean, M., and Hodgson, D. A.: Holocene dynamics of
the Southern Hemisphere westerly winds and possible links to CO2
outgassing, Nat. Geosci., 11, 650–655, https://doi.org/10.1038/s41561-018-0186-5, 2018.
Schlitzer, R.: Ocean Data View, available at: https://odv.awi.de/ (last access: January 2019), 2014.
Schulz, M. and Mudelsee, M.: REDFIT?: estimating red-noise spectra directly
from unevenly spaced paleoclimatic time series, Comput. Geosci., 28,
421–426, https://doi.org/10.1016/S0098-3004(01)00044-9, 2002.
Schweitzer, P. N.: Monthly averaged polar sea-ice concentration. U.S.
Geological Survey Digital Data Series, Virginia, https://doi.org/10.3133/ds27, 1995.
Screen, J. A., Gillett, N. P., Stevens, D. P., Marshall, G. J., and Roscoe,
H. K.: The role of eddies in the Southern Ocean temperature response to the
Southern Annular Mode, J. Climate, 22, 806–818,
https://doi.org/10.1175/2008JCLI2416.1, 2009.
Shevenell, A. E., Ingalls, A. E., Domack, E. W., and Kelly, C.: Holocene
Southern Ocean surface temperature variability west of the Antarctic
Peninsula, Nature, 470, 250–254, https://doi.org/10.1038/nature09751, 2011.
Siani, G., Michel, E., Pol-holz, R. De, Devries, T., Lamy, F., Isguder, G.,
Dewilde, F., and Lourantou, A.: Carbon isotope records reveal precise timing
of enhanced Southern Ocean upwelling during the last deglaciation, Nat.
Commun., 4, 2758, https://doi.org/10.1038/ncomms3758, 2013.
Sokolov, S. and Rintoul, S. R.: Circumpolar structure and distribution of
the Antarctic Circumpolar Current fronts: 1. Mean circumpolar paths, J.
Geophys. Res.-Oceans, 114, C11018, https://doi.org/10.1029/2008JC005108, 2009.
Stenni, B., Buiron, D., Frezzotti, M., Albani, S., Barbante, C., Bard, E.,
Barnola, J. M., Baroni, M., Baumgartner, M., Bonazza, M., Capron, E.,
Castellano, E., Chappellaz, J., Delmonte, B., Falourd, S., Genoni, L.,
Iacumin, P., Jouzel, J., Kipfstuhl, S., Landais, A., Lemieux-Dudon, B.,
Maggi, V., Masson-Delmotte, V., Mazzola, C., Minster, B., Montagnat, M.,
Mulvaney, R., Narcisi, B., Oerter, H., Parrenin, F., Petit, J. R., Ritz, C.,
Scarchilli, C., Schilt, A., Schüpbach, S., Schwander, J., Selmo, E.,
Severi, M., Stocker T. F., and Udisti, R.: Expression of the bipolar see-saw
in Antarctic climate records during the last deglaciation, Nat. Geosci.,
4, 46–49, https://doi.org/10.1038/ngeo1026, 2011.
Stocker, T. F. and Johnsen, S. J.: A minimum thermodynamic model for the
bipolar seesaw, Paleoceanography, 18, 1087, https://doi.org/10.1029/2003PA000920, 2003.
Swart, N. C. and Fyfe, J. C.: Observed and simulated changes in the Southern
Hemisphere surface westerly wind-stress, Geophys. Res. Lett., 39,
6–11, https://doi.org/10.1029/2012GL052810, 2012.
Turney, C. S. M., Jones, R. T., Fogwill, C., Hatton, J., Williams, A. N., Hogg, A., Thomas, Z. A., Palmer, J., Mooney, S., and Reimer, R. W.: A 250-year periodicity in Southern Hemisphere westerly winds over the last 2600 years, Clim. Past, 12, 189–200, https://doi.org/10.5194/cp-12-189-2016, 2016.
van Beek, P., Reyss, J.-L., Paterne, M., Gersonde, R., van der Loeff, M. R., and Kuhn, G.: 226Ra in barite: Absolute dating of Holocene Southern Ocean
sediments and reconstruction of sea-surface reservoir ages, Geology, 30,
731–734, https://doi.org/10.1130/0091-7613(2002)030<0731:RIBADO>2.0.CO;2,
2002.
Verleyen, E., Hodgson, D. A., Sabbe, K., Cremer, H., Emslie, S. D., Gibson,
J., Hall, B., Imura, S., Kudoh, S., Marshall, G. J., McMinn, A., Melles, M.,
Newman, L., Roberts, D., Roberts, S. J., Singh, S. M., Sterken, M.,
Tavernier, I., Verkulich, S., Van de Vyver, E., Van Nieuwenhuyze, W.,
Wagner, B., and Vyverman, W.: Post-glacial regional climate variability along
the East Antarctic coastal margin—evidence from shallow marine and coastal
terrestrial records, Earth-Sci. Rev., 104, 199–212,
https://doi.org/10.1016/j.earscirev.2010.10.006, 2011.
Walker, M., Head, M., J., Berkelhammer, M., Björck, S., Cheng, H.,
Cwynar, L., Fisher, D., Gkinis, V., Long, A., and Lowe, J.: Formal
Ratification of the Subdivision of the Holocene Series/Epoch (Quaternary
System/Period): Two New Global Boundary Stratotype Sections and Points
(GSSPs) and Three New Stages/Subseries, Episodes, 41, 213–223,
https://doi.org/10.1007/s12594-019-1141-9, 2018.
Xiao, W., Esper, O., and Gersonde, R.: Last Glacial - Holocene climate
variability in the Atlantic sector of the Southern Ocean, Quaternary Sci. Rev.,
135, 115–137, https://doi.org/10.1016/j.quascirev.2016.01.023, 2016.
Zielinski, U. and Gersonde. R.: Diatom Distribution in Southern Ocean
Surface Sediments (Atlantic Sector): Implications for Paleoenvironmental
Reconstructions, Palaeogeogr. Palaeocl., 129, 213–250,
https://doi.org/10.1016/S0031-0182(96)00130-7, 1997.
Short summary
A record of past sea temperature in the Indian sector of the Southern Ocean, spanning the last 14 200 years, has been developed by analysis of fossil diatoms in marine sediment. During the late deglaciation the reconstructed temperature changes were highly similar to those over Antarctica, most likely due to a reorganisation of global ocean and atmospheric circulation. During the last 11 600 years temperatures gradually cooled and became increasingly variable.
A record of past sea temperature in the Indian sector of the Southern Ocean, spanning the last...
