Articles | Volume 14, issue 10
https://doi.org/10.5194/cp-14-1463-2018
© 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-14-1463-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 Oct 2018
Research article |
| 19 Oct 2018
| 19 Oct 2018
Eemian Greenland SMB strongly sensitive to model choice
Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Bergen,
Norway
Kerim H. Nisancioglu
Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Bergen,
Norway
Centre for Earth Evolution and Dynamics, University of Oslo,
Oslo, Norway
Sébastien Le clec'h
Laboratoire des Sciences du Climat et de l'Environnement,
LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191
Gif-sur-Yvette, France
Earth System Science and Department Geografie, Vrije Universiteit Brussel, Brussels, Belgium
Andreas Born
Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Bergen,
Norway
Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Petra M. Langebroek
Uni Research Climate and Bjerknes Centre for Climate Research, Bergen, Norway
Chuncheng Guo
Uni Research Climate and Bjerknes Centre for Climate Research, Bergen, Norway
Michael Imhof
Laboratory of Hydraulics, Hydrology and Glaciology, ETH Zürich, Zürich, Switzerland
Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
Thomas F. Stocker
Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
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We constrain the global emissions of the very potent greenhouse gas sulfur hexafluoride (SF6) between 2005 and 2021. We show that SF6 emissions are decreasing in the USA and in the EU, while they are substantially growing in China, leading overall to an increasing global emission trend. The national reports for the USA, EU, and China all underestimated their SF6 emissions. However, stringent mitigation measures can successfully reduce SF6 emissions, as can be seen in the EU emission trend.
Lucie Bakels, Daria Tatsii, Anne Tipka, Rona Thompson, Marina Dütsch, Michael Blaschek, Petra Seibert, Katharina Baier, Silvia Bucci, Massimo Cassiani, Sabine Eckhardt, Christine Groot Zwaaftink, Stephan Henne, Pirmin Kaufmann, Vincent Lechner, Christian Maurer, Marie D. Mulder, Ignacio Pisso, Andreas Plach, Rakesh Subramanian, Martin Vojta, and Andreas Stohl
Geosci. Model Dev., 17, 7595–7627, https://doi.org/10.5194/gmd-17-7595-2024, https://doi.org/10.5194/gmd-17-7595-2024, 2024
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Computer models are essential for improving our understanding of how gases and particles move in the atmosphere. We present an update of the atmospheric transport model FLEXPART. FLEXPART 11 is more accurate due to a reduced number of interpolations and a new scheme for wet deposition. It can simulate non-spherical aerosols and includes linear chemical reactions. It is parallelised using OpenMP and includes new user options. A new user manual details how to use FLEXPART 11.
Tobias Zolles and Andreas Born
The Cryosphere, 18, 4831–4844, https://doi.org/10.5194/tc-18-4831-2024, https://doi.org/10.5194/tc-18-4831-2024, 2024
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The Greenland ice sheet largely depends on the climate state. The uncertainties associated with the year-to-year variability have only a marginal impact on our simulated surface mass budget; this increases our confidence in projections and reconstructions. Basing the simulations on proxies, e.g., temperature, results in overestimates of the surface mass balance, as climatologies lead to small amounts of snowfall every day. This can be reduced by including sub-monthly precipitation variability.
Christian Wirths, Thomas F. Stocker, and Johannes C. R. Sutter
The Cryosphere, 18, 4435–4462, https://doi.org/10.5194/tc-18-4435-2024, https://doi.org/10.5194/tc-18-4435-2024, 2024
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We investigated the influence of several regional climate models on the Antarctic Ice Sheet when applied as forcing for the Parallel Ice Sheet Model (PISM). Our study shows that the choice of regional climate model forcing results in uncertainties of around a tenth of those in future sea level rise projections and also affects the extent of grounding line retreat in West Antarctica.
David M. Chandler and Petra M. Langebroek
Clim. Past, 20, 2055–2080, https://doi.org/10.5194/cp-20-2055-2024, https://doi.org/10.5194/cp-20-2055-2024, 2024
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Sea level rise and global climate change caused by ice melt in Antarctica represent a puzzle of feedbacks between the climate, ocean, and ice sheets over tens to thousands of years. Antarctic Ice Sheet melting is caused mainly by warm deep water from the Southern Ocean. Here, we analyse close relationships between deep water temperatures and global climate over the last 800 000 years. This knowledge can help us to better understand how climate and sea level are likely to change in the future.
Therese Rieckh, Andreas Born, Alexander Robinson, Robert Law, and Gerrit Gülle
Geosci. Model Dev., 17, 6987–7000, https://doi.org/10.5194/gmd-17-6987-2024, https://doi.org/10.5194/gmd-17-6987-2024, 2024
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We present the open-source model ELSA, which simulates the internal age structure of large ice sheets. It creates layers of snow accumulation at fixed times during the simulation, which are used to model the internal stratification of the ice sheet. Together with reconstructed isochrones from radiostratigraphy data, ELSA can be used to assess ice sheet models and to improve their parameterization. ELSA can be used coupled to an ice sheet model or forced with its output.
Markus Adloff, Frerk Pöppelmeier, Aurich Jeltsch-Thömmes, Thomas F. Stocker, and Fortunat Joos
Clim. Past, 20, 1233–1250, https://doi.org/10.5194/cp-20-1233-2024, https://doi.org/10.5194/cp-20-1233-2024, 2024
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The Atlantic Meridional Overturning Circulation (AMOC) is an ocean current that transports heat into the North Atlantic. Over the ice age cycles, AMOC strength and its spatial pattern varied. We tested the role of heat forcing for these AMOC changes by simulating the temperature changes of the last eight glacial cycles. In our model, AMOC shifts between four distinct circulation modes caused by heat and salt redistributions that reproduce reconstructed long-term North Atlantic SST changes.
Bjorn Stevens, Stefan Adami, Tariq Ali, Hartwig Anzt, Zafer Aslan, Sabine Attinger, Jaana Bäck, Johanna Baehr, Peter Bauer, Natacha Bernier, Bob Bishop, Hendryk Bockelmann, Sandrine Bony, Guy Brasseur, David N. Bresch, Sean Breyer, Gilbert Brunet, Pier Luigi Buttigieg, Junji Cao, Christelle Castet, Yafang Cheng, Ayantika Dey Choudhury, Deborah Coen, Susanne Crewell, Atish Dabholkar, Qing Dai, Francisco Doblas-Reyes, Dale Durran, Ayoub El Gaidi, Charlie Ewen, Eleftheria Exarchou, Veronika Eyring, Florencia Falkinhoff, David Farrell, Piers M. Forster, Ariane Frassoni, Claudia Frauen, Oliver Fuhrer, Shahzad Gani, Edwin Gerber, Debra Goldfarb, Jens Grieger, Nicolas Gruber, Wilco Hazeleger, Rolf Herken, Chris Hewitt, Torsten Hoefler, Huang-Hsiung Hsu, Daniela Jacob, Alexandra Jahn, Christian Jakob, Thomas Jung, Christopher Kadow, In-Sik Kang, Sarah Kang, Karthik Kashinath, Katharina Kleinen-von Königslöw, Daniel Klocke, Uta Kloenne, Milan Klöwer, Chihiro Kodama, Stefan Kollet, Tobias Kölling, Jenni Kontkanen, Steve Kopp, Michal Koran, Markku Kulmala, Hanna Lappalainen, Fakhria Latifi, Bryan Lawrence, June Yi Lee, Quentin Lejeun, Christian Lessig, Chao Li, Thomas Lippert, Jürg Luterbacher, Pekka Manninen, Jochem Marotzke, Satoshi Matsouoka, Charlotte Merchant, Peter Messmer, Gero Michel, Kristel Michielsen, Tomoki Miyakawa, Jens Müller, Ramsha Munir, Sandeep Narayanasetti, Ousmane Ndiaye, Carlos Nobre, Achim Oberg, Riko Oki, Tuba Özkan-Haller, Tim Palmer, Stan Posey, Andreas Prein, Odessa Primus, Mike Pritchard, Julie Pullen, Dian Putrasahan, Johannes Quaas, Krishnan Raghavan, Venkatachalam Ramaswamy, Markus Rapp, Florian Rauser, Markus Reichstein, Aromar Revi, Sonakshi Saluja, Masaki Satoh, Vera Schemann, Sebastian Schemm, Christina Schnadt Poberaj, Thomas Schulthess, Cath Senior, Jagadish Shukla, Manmeet Singh, Julia Slingo, Adam Sobel, Silvina Solman, Jenna Spitzer, Philip Stier, Thomas Stocker, Sarah Strock, Hang Su, Petteri Taalas, John Taylor, Susann Tegtmeier, Georg Teutsch, Adrian Tompkins, Uwe Ulbrich, Pier-Luigi Vidale, Chien-Ming Wu, Hao Xu, Najibullah Zaki, Laure Zanna, Tianjun Zhou, and Florian Ziemen
Earth Syst. Sci. Data, 16, 2113–2122, https://doi.org/10.5194/essd-16-2113-2024, https://doi.org/10.5194/essd-16-2113-2024, 2024
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To manage Earth in the Anthropocene, new tools, new institutions, and new forms of international cooperation will be required. Earth Virtualization Engines is proposed as an international federation of centers of excellence to empower all people to respond to the immense and urgent challenges posed by climate change.
Gustav Jungdal-Olesen, Jane Lund Andersen, Andreas Born, and Vivi Kathrine Pedersen
The Cryosphere, 18, 1517–1532, https://doi.org/10.5194/tc-18-1517-2024, https://doi.org/10.5194/tc-18-1517-2024, 2024
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We explore how the shape of the land and underwater features in Scandinavia affected the former Scandinavian ice sheet over time. Using a computer model, we simulate how the ice sheet evolved during different stages of landscape development. We discovered that early glaciations were limited in size by underwater landforms, but as these changed, the ice sheet expanded more rapidly. Our findings highlight the importance of considering landscape changes when studying ice-sheet history.
Xin Ren, Daniel J. Lunt, Erica Hendy, Anna von der Heydt, Ayako Abe-Ouchi, Bette Otto-Bliesner, Charles J. R. Williams, Christian Stepanek, Chuncheng Guo, Deepak Chandan, Gerrit Lohmann, Julia C. Tindall, Linda E. Sohl, Mark A. Chandler, Masa Kageyama, Michiel L. J. Baatsen, Ning Tan, Qiong Zhang, Ran Feng, Stephen Hunter, Wing-Le Chan, W. Richard Peltier, Xiangyu Li, Youichi Kamae, Zhongshi Zhang, and Alan M. Haywood
Clim. Past, 19, 2053–2077, https://doi.org/10.5194/cp-19-2053-2023, https://doi.org/10.5194/cp-19-2053-2023, 2023
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We investigate the Maritime Continent climate in the mid-Piacenzian warm period and find it is warmer and wetter and the sea surface salinity is lower compared with preindustrial period. Besides, the fresh and warm water transfer through the Maritime Continent was stronger. In order to avoid undue influence from closely related models in the multimodel results, we introduce a new metric, the multi-cluster mean, which could reveal spatial signals that are not captured by the multimodel mean.
Emily A. Hill, Benoît Urruty, Ronja Reese, Julius Garbe, Olivier Gagliardini, Gaël Durand, Fabien Gillet-Chaulet, G. Hilmar Gudmundsson, Ricarda Winkelmann, Mondher Chekki, David Chandler, and Petra M. Langebroek
The Cryosphere, 17, 3739–3759, https://doi.org/10.5194/tc-17-3739-2023, https://doi.org/10.5194/tc-17-3739-2023, 2023
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The grounding lines of the Antarctic Ice Sheet could enter phases of irreversible retreat or advance. We use three ice sheet models to show that the present-day locations of Antarctic grounding lines are reversible with respect to a small perturbation away from their current position. This indicates that present-day retreat of the grounding lines is not yet irreversible or self-enhancing.
Ronja Reese, Julius Garbe, Emily A. Hill, Benoît Urruty, Kaitlin A. Naughten, Olivier Gagliardini, Gaël Durand, Fabien Gillet-Chaulet, G. Hilmar Gudmundsson, David Chandler, Petra M. Langebroek, and Ricarda Winkelmann
The Cryosphere, 17, 3761–3783, https://doi.org/10.5194/tc-17-3761-2023, https://doi.org/10.5194/tc-17-3761-2023, 2023
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We use an ice sheet model to test where current climate conditions in Antarctica might lead. We find that present-day ocean and atmosphere conditions might commit an irreversible collapse of parts of West Antarctica which evolves over centuries to millennia. Importantly, this collapse is not irreversible yet.
Bjørg Risebrobakken, Mari F. Jensen, Helene R. Langehaug, Tor Eldevik, Anne Britt Sandø, Camille Li, Andreas Born, Erin Louise McClymont, Ulrich Salzmann, and Stijn De Schepper
Clim. Past, 19, 1101–1123, https://doi.org/10.5194/cp-19-1101-2023, https://doi.org/10.5194/cp-19-1101-2023, 2023
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In the observational period, spatially coherent sea surface temperatures characterize the northern North Atlantic at multidecadal timescales. We show that spatially non-coherent temperature patterns are seen both in further projections and a past warm climate period with a CO2 level comparable to the future low-emission scenario. Buoyancy forcing is shown to be important for northern North Atlantic temperature patterns.
Anja Eichler, Michel Legrand, Theo M. Jenk, Susanne Preunkert, Camilla Andersson, Sabine Eckhardt, Magnuz Engardt, Andreas Plach, and Margit Schwikowski
The Cryosphere, 17, 2119–2137, https://doi.org/10.5194/tc-17-2119-2023, https://doi.org/10.5194/tc-17-2119-2023, 2023
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We investigate how a 250-year history of the emission of air pollutants (major inorganic aerosol constituents, black carbon, and trace species) is preserved in ice cores from four sites in the European Alps. The observed uniform timing in species-dependent longer-term concentration changes reveals that the different ice-core records provide a consistent, spatially representative signal of the pollution history from western European countries.
Qi Shu, Qiang Wang, Chuncheng Guo, Zhenya Song, Shizhu Wang, Yan He, and Fangli Qiao
Geosci. Model Dev., 16, 2539–2563, https://doi.org/10.5194/gmd-16-2539-2023, https://doi.org/10.5194/gmd-16-2539-2023, 2023
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Ocean models are often used for scientific studies on the Arctic Ocean. Here the Arctic Ocean simulations by state-of-the-art global ocean–sea-ice models participating in the Ocean Model Intercomparison Project (OMIP) were evaluated. The simulations on Arctic Ocean hydrography, freshwater content, stratification, sea surface height, and gateway transports were assessed and the common biases were detected. The simulations forced by different atmospheric forcing were also evaluated.
Claire Waelbroeck, Jerry Tjiputra, Chuncheng Guo, Kerim H. Nisancioglu, Eystein Jansen, Natalia Vázquez Riveiros, Samuel Toucanne, Frédérique Eynaud, Linda Rossignol, Fabien Dewilde, Elodie Marchès, Susana Lebreiro, and Silvia Nave
Clim. Past, 19, 901–913, https://doi.org/10.5194/cp-19-901-2023, https://doi.org/10.5194/cp-19-901-2023, 2023
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The precise geometry and extent of Atlantic circulation changes that accompanied rapid climate changes of the last glacial period are still unknown. Here, we combine carbon isotopic records from 18 Atlantic sediment cores with numerical simulations and decompose the carbon isotopic change across a cold-to-warm transition into remineralization and circulation components. Our results show that the replacement of southern-sourced by northern-sourced water plays a dominant role below ~ 3000 m depth.
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.
Jakob Schwander, Thomas F. Stocker, Remo Walther, and Samuel Marending
The Cryosphere, 17, 1151–1164, https://doi.org/10.5194/tc-17-1151-2023, https://doi.org/10.5194/tc-17-1151-2023, 2023
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RADIX (Rapid Access Drilling and Ice eXtraction) is a fast-access ice-drilling system for prospecting future deep-drilling sites on glaciers and polar ice sheets. It consists of a 40 mm rapid firn drill, a 20 mm deep drill and a logger. The maximum depth range of RADIX is 3100 m by design. The nominal drilling speed is on the order of 40 m h-1. The 15 mm diameter logger provides data on the hole inclination and direction and measures temperature and dust in the ice surrounding the borehole.
Niccolò Maffezzoli, Eliza Cook, Willem G. M. van der Bilt, Eivind N. Støren, Daniela Festi, Florian Muthreich, Alistair W. R. Seddon, François Burgay, Giovanni Baccolo, Amalie R. F. Mygind, Troels Petersen, Andrea Spolaor, Sebastiano Vascon, Marcello Pelillo, Patrizia Ferretti, Rafael S. dos Reis, Jefferson C. Simões, Yuval Ronen, Barbara Delmonte, Marco Viccaro, Jørgen Peder Steffensen, Dorthe Dahl-Jensen, Kerim H. Nisancioglu, and Carlo Barbante
The Cryosphere, 17, 539–565, https://doi.org/10.5194/tc-17-539-2023, https://doi.org/10.5194/tc-17-539-2023, 2023
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Multiple lines of research in ice core science are limited by manually intensive and time-consuming optical microscopy investigations for the detection of insoluble particles, from pollen grains to volcanic shards. To help overcome these limitations and support researchers, we present a novel methodology for the identification and autonomous classification of ice core insoluble particles based on flow image microscopy and neural networks.
Karita Kajanto, Fiammetta Straneo, and Kerim Nisancioglu
The Cryosphere, 17, 371–390, https://doi.org/10.5194/tc-17-371-2023, https://doi.org/10.5194/tc-17-371-2023, 2023
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Many outlet glaciers in Greenland are connected to the ocean by narrow glacial fjords, where warm water melts the glacier from underneath. Ocean water is modified in these fjords through processes that are poorly understood, particularly iceberg melt. We use a model to show how iceberg melt cools down Ilulissat Icefjord and causes circulation to take place deeper in the fjord than if there were no icebergs. This causes the glacier to melt less and from a smaller area than without icebergs.
Julia E. Weiffenbach, Michiel L. J. Baatsen, Henk A. Dijkstra, Anna S. von der Heydt, Ayako Abe-Ouchi, Esther C. Brady, Wing-Le Chan, Deepak Chandan, Mark A. Chandler, Camille Contoux, Ran Feng, Chuncheng Guo, Zixuan Han, Alan M. Haywood, Qiang Li, Xiangyu Li, Gerrit Lohmann, Daniel J. Lunt, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, W. Richard Peltier, Gilles Ramstein, Linda E. Sohl, Christian Stepanek, Ning Tan, Julia C. Tindall, Charles J. R. Williams, Qiong Zhang, and Zhongshi Zhang
Clim. Past, 19, 61–85, https://doi.org/10.5194/cp-19-61-2023, https://doi.org/10.5194/cp-19-61-2023, 2023
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We study the behavior of the Atlantic Meridional Overturning Circulation (AMOC) in the mid-Pliocene. The mid-Pliocene was about 3 million years ago and had a similar CO2 concentration to today. We show that the stronger AMOC during this period relates to changes in geography and that this has a significant influence on ocean temperatures and heat transported northwards by the Atlantic Ocean. Understanding the behavior of the mid-Pliocene AMOC can help us to learn more about our future climate.
Andreas Plach, Rolf Rüfenacht, Simone Kotthaus, and Markus Leuenberger
EGUsphere, https://doi.org/10.5194/egusphere-2022-1019, https://doi.org/10.5194/egusphere-2022-1019, 2022
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Greenhouse gases emissions are contributing to global warming and it is essential to better understand where they originate from and how they are transported. In this study we analyze greenhouse gas observations at a Swiss tall tower where measurements are taken more than 200 m above ground and investigate their origin by looking at the condition of the atmosphere at the time of the observations. We find that most pollution at this site is caused from emissions transported from further away.
Martin Vojta, Andreas Plach, Rona L. Thompson, and Andreas Stohl
Geosci. Model Dev., 15, 8295–8323, https://doi.org/10.5194/gmd-15-8295-2022, https://doi.org/10.5194/gmd-15-8295-2022, 2022
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In light of recent global warming, we aim to improve methods for modeling greenhouse gas emissions in order to support the successful implementation of the Paris Agreement. In this study, we investigate certain aspects of a Bayesian inversion method that uses computer simulations and atmospheric observations to improve estimates of greenhouse gas emissions. We explore method limitations, discuss problems, and suggest improvements.
Basile de Fleurian, Richard Davy, and Petra M. Langebroek
The Cryosphere, 16, 2265–2283, https://doi.org/10.5194/tc-16-2265-2022, https://doi.org/10.5194/tc-16-2265-2022, 2022
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As temperature increases, more snow and ice melt at the surface of ice sheets. Here we use an ice dynamics and subglacial hydrology model with simplified geometry and climate forcing to study the impact of variations in meltwater on ice dynamics. We focus on the variations in length and intensity of the melt season. Our results show that a longer melt season leads to faster glaciers, but a more intense melt season reduces glaciers' seasonal velocities, albeit leading to higher peak velocities.
Santos J. González-Rojí, Martina Messmer, Christoph C. Raible, and Thomas F. Stocker
Geosci. Model Dev., 15, 2859–2879, https://doi.org/10.5194/gmd-15-2859-2022, https://doi.org/10.5194/gmd-15-2859-2022, 2022
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Different configurations of physics parameterizations of a regional climate model are tested over southern Peru at fine resolution. The most challenging regions compared to observational data are the slopes of the Andes. Model configurations for Europe and East Africa are not perfectly suitable for southern Peru. The experiment with the Stony Brook University microphysics scheme and the Grell–Freitas cumulus parameterization provides the most accurate results over Madre de Dios.
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.
Thomas Frank, Henning Åkesson, Basile de Fleurian, Mathieu Morlighem, and Kerim H. Nisancioglu
The Cryosphere, 16, 581–601, https://doi.org/10.5194/tc-16-581-2022, https://doi.org/10.5194/tc-16-581-2022, 2022
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The shape of a fjord can promote or inhibit glacier retreat in response to climate change. We conduct experiments with a synthetic setup under idealized conditions in a numerical model to study and quantify the processes involved. We find that friction between ice and fjord is the most important factor and that it is possible to directly link ice discharge and grounding line retreat to fjord topography in a quantitative way.
Katharina M. Holube, Tobias Zolles, and Andreas Born
The Cryosphere, 16, 315–331, https://doi.org/10.5194/tc-16-315-2022, https://doi.org/10.5194/tc-16-315-2022, 2022
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We simulated the surface mass balance of the Greenland Ice Sheet in the 21st century by forcing a snow model with the output of many Earth system models and four greenhouse gas emission scenarios. We quantify the contribution to uncertainty in surface mass balance of these two factors and the choice of parameters of the snow model. The results show that the differences between Earth system models are the main source of uncertainty. This effect is localised mostly near the equilibrium line.
Charles Pelletier, Thierry Fichefet, Hugues Goosse, Konstanze Haubner, Samuel Helsen, Pierre-Vincent Huot, Christoph Kittel, François Klein, Sébastien Le clec'h, Nicole P. M. van Lipzig, Sylvain Marchi, François Massonnet, Pierre Mathiot, Ehsan Moravveji, Eduardo Moreno-Chamarro, Pablo Ortega, Frank Pattyn, Niels Souverijns, Guillian Van Achter, Sam Vanden Broucke, Alexander Vanhulle, Deborah Verfaillie, and Lars Zipf
Geosci. Model Dev., 15, 553–594, https://doi.org/10.5194/gmd-15-553-2022, https://doi.org/10.5194/gmd-15-553-2022, 2022
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We present PARASO, a circumpolar model for simulating the Antarctic climate. PARASO features five distinct models, each covering different Earth system subcomponents (ice sheet, atmosphere, land, sea ice, ocean). In this technical article, we describe how this tool has been developed, with a focus on the
coupling interfacesrepresenting the feedbacks between the distinct models used for contribution. PARASO is stable and ready to use but is still characterized by significant biases.
Zixuan Han, Qiong Zhang, Qiang Li, Ran Feng, Alan M. Haywood, Julia C. Tindall, Stephen J. Hunter, Bette L. Otto-Bliesner, Esther C. Brady, Nan Rosenbloom, Zhongshi Zhang, Xiangyu Li, Chuncheng Guo, Kerim H. Nisancioglu, Christian Stepanek, Gerrit Lohmann, Linda E. Sohl, Mark A. Chandler, Ning Tan, Gilles Ramstein, Michiel L. J. Baatsen, Anna S. von der Heydt, Deepak Chandan, W. Richard Peltier, Charles J. R. Williams, Daniel J. Lunt, Jianbo Cheng, Qin Wen, and Natalie J. Burls
Clim. Past, 17, 2537–2558, https://doi.org/10.5194/cp-17-2537-2021, https://doi.org/10.5194/cp-17-2537-2021, 2021
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Understanding the potential processes responsible for large-scale hydrological cycle changes in a warmer climate is of great importance. Our study implies that an imbalance in interhemispheric atmospheric energy during the mid-Pliocene could have led to changes in the dynamic effect, offsetting the thermodynamic effect and, hence, altering mid-Pliocene hydroclimate cycling. Moreover, a robust westward shift in the Pacific Walker circulation can moisten the northern Indian Ocean.
Arthur M. Oldeman, Michiel L. J. Baatsen, Anna S. von der Heydt, Henk A. Dijkstra, Julia C. Tindall, Ayako Abe-Ouchi, Alice R. Booth, Esther C. Brady, Wing-Le Chan, Deepak Chandan, Mark A. Chandler, Camille Contoux, Ran Feng, Chuncheng Guo, Alan M. Haywood, Stephen J. Hunter, Youichi Kamae, Qiang Li, Xiangyu Li, Gerrit Lohmann, Daniel J. Lunt, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, W. Richard Peltier, Gabriel M. Pontes, Gilles Ramstein, Linda E. Sohl, Christian Stepanek, Ning Tan, Qiong Zhang, Zhongshi Zhang, Ilana Wainer, and Charles J. R. Williams
Clim. Past, 17, 2427–2450, https://doi.org/10.5194/cp-17-2427-2021, https://doi.org/10.5194/cp-17-2427-2021, 2021
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In this work, we have studied the behaviour of El Niño events in the mid-Pliocene, a period of around 3 million years ago, using a collection of 17 climate models. It is an interesting period to study, as it saw similar atmospheric carbon dioxide levels to the present day. We find that the El Niño events were less strong in the mid-Pliocene simulations, when compared to pre-industrial climate. Our results could help to interpret El Niño behaviour in future climate projections.
Ingo Bethke, Yiguo Wang, François Counillon, Noel Keenlyside, Madlen Kimmritz, Filippa Fransner, Annette Samuelsen, Helene Langehaug, Lea Svendsen, Ping-Gin Chiu, Leilane Passos, Mats Bentsen, Chuncheng Guo, Alok Gupta, Jerry Tjiputra, Alf Kirkevåg, Dirk Olivié, Øyvind Seland, Julie Solsvik Vågane, Yuanchao Fan, and Tor Eldevik
Geosci. Model Dev., 14, 7073–7116, https://doi.org/10.5194/gmd-14-7073-2021, https://doi.org/10.5194/gmd-14-7073-2021, 2021
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The Norwegian Climate Prediction Model version 1 (NorCPM1) is a new research tool for performing climate reanalyses and seasonal-to-decadal climate predictions. It adds data assimilation capability to the Norwegian Earth System Model version 1 (NorESM1) and has contributed output to the Decadal Climate Prediction Project (DCPP) as part of the sixth Coupled Model Intercomparison Project (CMIP6). We describe the system and evaluate its baseline, reanalysis and prediction performance.
Frerk Pöppelmeier, David J. Janssen, Samuel L. Jaccard, and Thomas F. Stocker
Biogeosciences, 18, 5447–5463, https://doi.org/10.5194/bg-18-5447-2021, https://doi.org/10.5194/bg-18-5447-2021, 2021
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Chromium (Cr) is a redox-sensitive element that holds promise as a tracer of ocean oxygenation and biological activity. We here implemented the oxidation states Cr(III) and Cr(VI) in the Bern3D model to investigate the processes that shape the global Cr distribution. We find a Cr ocean residence time of 5–8 kyr and that the benthic source dominates the tracer budget. Further, regional model–data mismatches suggest strong Cr removal in oxygen minimum zones and a spatially variable benthic source.
Andreas Born and Alexander Robinson
The Cryosphere, 15, 4539–4556, https://doi.org/10.5194/tc-15-4539-2021, https://doi.org/10.5194/tc-15-4539-2021, 2021
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Ice penetrating radar reflections from the Greenland ice sheet are the best available record of past accumulation and how these layers have been deformed over time by the flow of ice. Direct simulations of this archive hold great promise for improving our models and for uncovering details of ice sheet dynamics that neither models nor data could achieve alone. We present the first three-dimensional ice sheet model that explicitly simulates individual layers of accumulation and how they deform.
Ellen Berntell, Qiong Zhang, Qiang Li, Alan M. Haywood, Julia C. Tindall, Stephen J. Hunter, Zhongshi Zhang, Xiangyu Li, Chuncheng Guo, Kerim H. Nisancioglu, Christian Stepanek, Gerrit Lohmann, Linda E. Sohl, Mark A. Chandler, Ning Tan, Camille Contoux, Gilles Ramstein, Michiel L. J. Baatsen, Anna S. von der Heydt, Deepak Chandan, William Richard Peltier, Ayako Abe-Ouchi, Wing-Le Chan, Youichi Kamae, Charles J. R. Williams, Daniel J. Lunt, Ran Feng, Bette L. Otto-Bliesner, and Esther C. Brady
Clim. Past, 17, 1777–1794, https://doi.org/10.5194/cp-17-1777-2021, https://doi.org/10.5194/cp-17-1777-2021, 2021
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The mid-Pliocene Warm Period (~ 3.2 Ma) is often considered an analogue for near-future climate projections, and model results from the PlioMIP2 ensemble show an increase of rainfall over West Africa and the Sahara region compared to pre-industrial conditions. Though previous studies of future projections show a west–east drying–wetting contrast over the Sahel, these results indicate a uniform rainfall increase over the Sahel in warm climates characterized by increased greenhouse gas forcing.
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.
Tobias Zolles and Andreas Born
The Cryosphere, 15, 2917–2938, https://doi.org/10.5194/tc-15-2917-2021, https://doi.org/10.5194/tc-15-2917-2021, 2021
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We investigate the sensitivity of a glacier surface mass and the energy balance model of the Greenland ice sheet for the cold period of the Last Glacial Maximum (LGM) and the present-day climate. The results show that the model sensitivity changes with climate. While for present-day simulations inclusions of sublimation and hoar formation are of minor importance, they cannot be neglected during the LGM. To simulate the surface mass balance over long timescales, a water vapor scheme is necessary.
Martina Messmer, Santos J. González-Rojí, Christoph C. Raible, and Thomas F. Stocker
Geosci. Model Dev., 14, 2691–2711, https://doi.org/10.5194/gmd-14-2691-2021, https://doi.org/10.5194/gmd-14-2691-2021, 2021
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Sensitivity experiments with the WRF model are run to find an optimal parameterization setup for precipitation around Mount Kenya at a scale that resolves convection (1 km). Precipitation is compared against many weather stations and gridded observational data sets. Both the temporal correlation of precipitation sums and pattern correlations show that fewer nests lead to a more constrained simulation with higher correlation. The Grell–Freitas cumulus scheme obtains the most accurate results.
Frerk Pöppelmeier, Jeemijn Scheen, Aurich Jeltsch-Thömmes, and Thomas F. Stocker
Clim. Past, 17, 615–632, https://doi.org/10.5194/cp-17-615-2021, https://doi.org/10.5194/cp-17-615-2021, 2021
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The stability of the Atlantic Meridional Overturning Circulation (AMOC) critically depends on its mean state. We simulate the response of the AMOC to North Atlantic freshwater perturbations under different glacial boundary conditions. We find that a closed Bering Strait greatly increases the AMOC's sensitivity to freshwater hosing. Further, the shift from mono- to bistability strongly depends on the chosen boundary conditions, with weaker circulation states exhibiting more abrupt transitions.
Zhongshi Zhang, Xiangyu Li, Chuncheng Guo, Odd Helge Otterå, Kerim H. Nisancioglu, Ning Tan, Camille Contoux, Gilles Ramstein, Ran Feng, Bette L. Otto-Bliesner, Esther Brady, Deepak Chandan, W. Richard Peltier, Michiel L. J. Baatsen, Anna S. von der Heydt, Julia E. Weiffenbach, Christian Stepanek, Gerrit Lohmann, Qiong Zhang, Qiang Li, Mark A. Chandler, Linda E. Sohl, Alan M. Haywood, Stephen J. Hunter, Julia C. Tindall, Charles Williams, Daniel J. Lunt, Wing-Le Chan, and Ayako Abe-Ouchi
Clim. Past, 17, 529–543, https://doi.org/10.5194/cp-17-529-2021, https://doi.org/10.5194/cp-17-529-2021, 2021
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The Atlantic Meridional Overturning Circulation (AMOC) is an important topic in the Pliocene Model Intercomparison Project. Previous studies have suggested a much stronger AMOC during the Pliocene than today. However, our current multi-model intercomparison shows large model spreads and model–data discrepancies, which can not support the previous hypothesis. Our study shows good consistency with future projections of the AMOC.
Andreas Plach, Bo M. Vinther, Kerim H. Nisancioglu, Sindhu Vudayagiri, and Thomas Blunier
Clim. Past, 17, 317–330, https://doi.org/10.5194/cp-17-317-2021, https://doi.org/10.5194/cp-17-317-2021, 2021
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In light of recent large-scale melting of the Greenland ice sheet
(GrIS), e.g., in the summer of 2012 several days with surface melt
on the entire ice sheet (including elevations above 3000 m), we use
computer simulations to estimate the amount of melt during a
warmer-than-present period of the past. Our simulations show more
extensive melt than today. This is important for the interpretation of
ice cores which are used to reconstruct the evolution of the ice sheet
and the climate.
Daniel J. Lunt, Fran Bragg, Wing-Le Chan, David K. Hutchinson, Jean-Baptiste Ladant, Polina Morozova, Igor Niezgodzki, Sebastian Steinig, Zhongshi Zhang, Jiang Zhu, Ayako Abe-Ouchi, Eleni Anagnostou, Agatha M. de Boer, Helen K. Coxall, Yannick Donnadieu, Gavin Foster, Gordon N. Inglis, Gregor Knorr, Petra M. Langebroek, Caroline H. Lear, Gerrit Lohmann, Christopher J. Poulsen, Pierre Sepulchre, Jessica E. Tierney, Paul J. Valdes, Evgeny M. Volodin, Tom Dunkley Jones, Christopher J. Hollis, Matthew Huber, and Bette L. Otto-Bliesner
Clim. Past, 17, 203–227, https://doi.org/10.5194/cp-17-203-2021, https://doi.org/10.5194/cp-17-203-2021, 2021
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This paper presents the first modelling results from the Deep-Time Model Intercomparison Project (DeepMIP), in which we focus on the early Eocene climatic optimum (EECO, 50 million years ago). We show that, in contrast to previous work, at least three models (CESM, GFDL, and NorESM) produce climate states that are consistent with proxy indicators of global mean temperature and polar amplification, and they achieve this at a CO2 concentration that is consistent with the CO2 proxy record.
Masa Kageyama, Louise C. Sime, Marie Sicard, Maria-Vittoria Guarino, Anne de Vernal, Ruediger Stein, David Schroeder, Irene Malmierca-Vallet, Ayako Abe-Ouchi, Cecilia Bitz, Pascale Braconnot, Esther C. Brady, Jian Cao, Matthew A. Chamberlain, Danny Feltham, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina Morozova, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, Ryouta O'ishi, Silvana Ramos Buarque, David Salas y Melia, Sam Sherriff-Tadano, Julienne Stroeve, Xiaoxu Shi, Bo Sun, Robert A. Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, Weipeng Zheng, and Tilo Ziehn
Clim. Past, 17, 37–62, https://doi.org/10.5194/cp-17-37-2021, https://doi.org/10.5194/cp-17-37-2021, 2021
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The Last interglacial (ca. 127 000 years ago) is a period with increased summer insolation at high northern latitudes, resulting in a strong reduction in Arctic sea ice. The latest PMIP4-CMIP6 models all simulate this decrease, consistent with reconstructions. However, neither the models nor the reconstructions agree on the possibility of a seasonally ice-free Arctic. Work to clarify the reasons for this model divergence and the conflicting interpretations of the records will thus be needed.
Bette L. Otto-Bliesner, Esther C. Brady, Anni Zhao, Chris M. Brierley, Yarrow Axford, Emilie Capron, Aline Govin, Jeremy S. Hoffman, Elizabeth Isaacs, Masa Kageyama, Paolo Scussolini, Polychronis C. Tzedakis, Charles J. R. Williams, Eric Wolff, Ayako Abe-Ouchi, Pascale Braconnot, Silvana Ramos Buarque, Jian Cao, Anne de Vernal, Maria Vittoria Guarino, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina A. Morozova, Kerim H. Nisancioglu, Ryouta O'ishi, David Salas y Mélia, Xiaoxu Shi, Marie Sicard, Louise Sime, Christian Stepanek, Robert Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, and Weipeng Zheng
Clim. Past, 17, 63–94, https://doi.org/10.5194/cp-17-63-2021, https://doi.org/10.5194/cp-17-63-2021, 2021
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The CMIP6–PMIP4 Tier 1 lig127k experiment was designed to address the climate responses to strong orbital forcing. We present a multi-model ensemble of 17 climate models, most of which have also completed the CMIP6 DECK experiments and are thus important for assessing future projections. The lig127ksimulations show strong summer warming over the NH continents. More than half of the models simulate a retreat of the Arctic minimum summer ice edge similar to the average for 2000–2018.
Cited articles
Abe-Ouchi, A., Segawa, T., and Saito, F.: Climatic Conditions for modelling
the Northern Hemisphere ice sheets throughout the ice age cycle, Clim. Past,
3, 423–438, https://doi.org/10.5194/cp-3-423-2007, 2007. a
American Meteorological Society: Moist-adiabatic lapse rate, Glossary of
Meteorology, available at:
http://glossary.ametsoc.org/wiki/Moist-adiabatic_lapse_rate (last
access: 20 February 2018), 2018. a
Bakker, P., Stone, E. J., Charbit, S., Gröger, M., Krebs-Kanzow, U.,
Ritz, S. P., Varma, V., Khon, V., Lunt, D. J., Mikolajewicz, U., Prange, M.,
Renssen, H., Schneider, B., and Schulz, M.: Last interglacial temperature
evolution – a model inter-comparison, Clim. Past, 9, 605–619,
https://doi.org/10.5194/cp-9-605-2013, 2013. a
Bamber, J. L., Griggs, J. A., Hurkmans, R. T. W. L., Dowdeswell, J. A.,
Gogineni, S. P., Howat, I., Mouginot, J., Paden, J., Palmer, S., Rignot, E.,
and Steinhage, D.: A new bed elevation dataset for Greenland, The Cryosphere,
7, 499–510, https://doi.org/10.5194/tc-7-499-2013, 2013. a, b
Barnola, J.-M., Pimienta, P., Raynaud, D., and Korotkevich, Y. S.:
CO2-climate relationship as deduced from the Vostok ice core: a
re-examination based on new measurements and on a re-evluation of the air
dating, Tellus B, 43, 83–90, 1990. a
Bentsen, M., Bethke, I., Debernard, J. B., Iversen, T., Kirkevåg, A.,
Seland, Ø., Drange, H., Roelandt, C., Seierstad, I. A., Hoose, C., and
Kristjánsson, J. E.: The Norwegian Earth System Model, NorESM1-M – Part
1: Description and basic evaluation of the physical climate, Geosci. Model
Dev., 6, 687–720, https://doi.org/10.5194/gmd-6-687-2013, 2013. a
Bleck, R., Rooth, C., Hu, D., and Smith, L. T.: Salinity-driven Thermocline
Transients in a Wind- and Thermohaline-forced Isopycnic Coordinate
Model of the North Atlantic, J. Phys. Oceanogr., 22,
1486–1505, https://doi.org/10.1175/1520-0485(1992)022<1486:SDTTIA>2.0.CO;2, 1992. a
Born, A., Imhof, M., and Stocker, T. F.: A surface energy and mass balance
model for simulations over multiple glacial cycles, The Cryosphere Discuss., in preparation,
2018. a
Braithwaite, R. J.: Positive degree-day factors for ablation on the
Greenland
ice sheet studied by energy-balance modelling, J. Glaciol., 41,
153–160, https://doi.org/10.3189/S0022143000017846, 1995. a
Bretherton, C. S., Widmann, M., Dymnikov, V. P., Wallace, J. M., and
Bladé,
I.: The Effective Number of Spatial Degrees of Freedom of a
Time-Varying Field, J. Climate, 12, 1990–2009,
https://doi.org/10.1175/1520-0442(1999)012<1990:TENOSD>2.0.CO;2, 1999. a
Brun, E., David, P., Sudul, M., and Brunot, G.: A numerical model to simulate
snow-cover stratigraphy for operational avalanche forecasting, J.
Glaciol., 38, 13–22, https://doi.org/10.3189/S0022143000009552, 1992. a
Buizert, C., Keisling, B. A., Box, J. E., He, F., Carlson, A. E., Sinclair,
G.,
and DeConto, R. M.: Greenland-Wide Seasonal Temperatures During the
Last Deglaciation, Geophys. Res. Lett., 45, 1905–1914,
https://doi.org/10.1002/2017GL075601, 2018. a
Calov, R., Robinson, A., Perrette, M., and Ganopolski, A.: Simulating the
Greenland ice sheet under present-day and palaeo constraints including a new
discharge parameterization, The Cryosphere, 9, 179–196,
https://doi.org/10.5194/tc-9-179-2015, 2015. a, b, c, d
CAPE Last Interglacial Project Members: Last Interglacial Arctic warmth
confirms polar amplification of climate change, Quaternary Sci. Rev.,
25, 1383–1400, https://doi.org/10.1016/j.quascirev.2006.01.033, 2006. a
Capron, E., Govin, A., Stone, E. J., Masson-Delmotte, V., Mulitza, S.,
Otto-Bliesner, B., Rasmussen, T. L., Sime, L. C., Waelbroeck, C., and Wolff,
E. W.: Temporal and spatial structure of multi-millennial temperature changes
at high latitudes during the Last Interglacial, Quaternary Sci.
Rev., 103, 116–133, https://doi.org/10.1016/j.quascirev.2014.08.018, 2014. a
Church, J. A., Clark, P. U., Cazenave, A., Gregory, J. M., Jevrejeva, S.,
Levermann, A., Merrifield, M. A., Milne, G. A., Nerem, R. S., Nunn, P. D.,
Payne, A. J., Pfeffer, W. T., Stammer, D., and Unnikrishnan, A. S.: Sea
Level Change, in: Climate Change 2013: The Physical Science
Basis. Contribution of Working Group I to the Fifth Assessment
Report of the Intergovernmental Panel on Climate Change, edited by: Stocker,
T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S. K.,
Boschung, J., Nauels, A., Xia, Y., Bex, V., and
Midgley, P. M.,
1137–1216, Cambridge University Press, Cambridge, UK and New York, NY, USA, 2013. a
Cuffey, K. M. and Marshall, S. J.: Substantial contribution to sea-level rise
during the last interglacial from the Greenland ice sheet, Nature, 404,
591–594, https://doi.org/10.1038/35007053, 2000. a
Dutton, A., Carlson, A. E., Long, A. J., Milne, G. A., Clark, P. U., DeConto,
R., Horton, B. P., Rahmstorf, S., and Raymo, M. E.: Sea-level rise due to
polar ice-sheet mass loss during past warm periods, Science, 349, aaa4019,
https://doi.org/10.1126/science.aaa4019, 2015. a
Faber, A.: Isotopes in Greenland precipitation. Isotope-enabled AGCM
modelling
and a new Greenland database of observations and ice core measurements, PhD
thesis, Centre for Ice and Climate, University of Copenhagen, 2016. a
Fettweis, X.: Reconstruction of the 1979–2006 Greenland ice sheet surface
mass balance using the regional climate model MAR, The Cryosphere, 1, 21–40,
https://doi.org/10.5194/tc-1-21-2007, 2007. a
Fettweis, X., Gallée, H., Lefebre, F., and Ypersele, J.-P. v.: Greenland
surface mass balance simulated by a regional climate model and comparison
with satellite-derived data in 1990–1991, Clim. Dynam., 24, 623–640,
https://doi.org/10.1007/s00382-005-0010-y, 2005. a
Fettweis, X., Franco, B., Tedesco, M., van Angelen, J. H., Lenaerts, J. T.
M., van den Broeke, M. R., and Gallée, H.: Estimating the Greenland ice
sheet surface mass balance contribution to future sea level rise using the
regional atmospheric climate model MAR, The Cryosphere, 7, 469–489,
https://doi.org/10.5194/tc-7-469-2013, 2013. a, b
Fettweis, X., Box, J. E., Agosta, C., Amory, C., Kittel, C., Lang, C., van
As, D., Machguth, H., and Gallée, H.: Reconstructions of the 1900–2015
Greenland ice sheet surface mass balance using the regional climate MAR
model, The Cryosphere, 11, 1015–1033,
https://doi.org/10.5194/tc-11-1015-2017, 2017. a, b, c
Fyke, J. G., Weaver, A. J., Pollard, D., Eby, M., Carter, L., and Mackintosh,
A.: A new coupled ice sheet/climate model: description and sensitivity to
model physics under Eemian, Last Glacial Maximum, late Holocene and modern
climate conditions, Geosci. Model Dev., 4, 117–136,
https://doi.org/10.5194/gmd-4-117-2011, 2011. a, b, c
Gallée, H. and Duynkerke, P. G.: Air-snow interactions and the surface
energy
and mass balance over the melting zone of west Greenland during the
Greenland Ice Margin Experiment, J. Geophys. Res.-Atmos., 102, 13813–13824,
https://doi.org/10.1029/96JD03358, 1997. a
Gallée, H. and Pettré, P.: Dynamical Constraints on Katabatic
Wind
Cessation in Adélie Land, Antarctica, J. Atmos.
Sci., 55, 1755–1770, https://doi.org/10.1175/1520-0469(1998)055<1755:DCOKWC>2.0.CO;2, 1998. a
Ganopolski, A. and Robinson, A.: Palaeoclimate: The past is not the future,
Nat. Geosci., 4, 661–663, https://doi.org/10.1038/ngeo1268, 2011. a
Gent, P. R., Danabasoglu, G., Donner, L. J., Holland, M. M., Hunke, E. C.,
Jayne, S. R., Lawrence, D. M., Neale, R. B., Rasch, P. J., Vertenstein, M.,
Worley, P. H., Yang, Z.-L., and Zhang, M.: The Community Climate System
Model Version 4, J. Climate, 24, 4973–4991,
https://doi.org/10.1175/2011JCLI4083.1, 2011. a
Goelzer, H., Huybrechts, P., Loutre, M.-F., and Fichefet, T.: Last
Interglacial climate and sea-level evolution from a coupled ice
sheet–climate model, Clim. Past, 12, 2195–2213,
https://doi.org/10.5194/cp-12-2195-2016, 2016. a
Greve, R.: Relation of measured basal temperatures and the spatial
distribution
of the geothermal heat flux for the Greenland ice sheet, Ann.
Glaciol., 42, 424–432, https://doi.org/10.3189/172756405781812510, 2005. a, b, c
Greve, R. and Blatter, H.: Dynamics of ice sheets and glaciers, Springer,
Berlin, Heidelberg,
https://doi.org/10.1007/978-3-642-03415-2, 2009. a
Guo, C., Bentsen, M., Bethke, I., Ilicak, M., Tjiputra, J., Toniazzo, T.,
Schwinger, J., and Otterå, O. H.: Description and evaluation of
NorESM1-F: A fast version of the Norwegian Earth System Model (NorESM),
Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2018-217, in review,
2018. a, b
Herron, M. M. and Langway, C. C.: Firn Densification: An Empirical
Model, J. Glaciol., 25, 373–385, https://doi.org/10.3189/S0022143000015239, 1980. a
Huybers, P.: Early Pleistocene Glacial Cycles and the Integrated
Summer Insolation Forcing, Science, 313, 508–511,
https://doi.org/10.1126/science.1125249, 2006. a
Huybrechts, P.: Sea-level changes at the LGM from ice-dynamic
reconstructions
of the Greenland and Antarctic ice sheets during glacial cycles,
Quaternary Sci. Rev., 21, 203–231,
https://doi.org/10.1016/S0277-3791(01)00082-8, 2002. a, b
Imhof, M.: An Energy and Mass Balance Firn Model coupled to the Ice Sheets of
the Northern Hemisphere, Master's thesis, University of Bern, master's
thesis, Physics Institute, University of Bern, 2016. a
Johnsen, S. J. and Vinther, B. M.: ICE CORE RECORDS/Greenland
Stable Isotopes, in: Encyclopedia of Quaternary Science,
edited by: Elias, S. A., 1250–1258, Elsevier, Oxford,
https://doi.org/10.1016/B0-44-452747-8/00345-8, 2007. a
Kessler, E.: On the Distribution and Continuity of Water Substance in
Atmospheric Circulations, in: On the Distribution and Continuity of
Water Substance in Atmospheric Circulations, Meteorological
Monographs, 1–84, American Meteorological Society, Boston, MA,
https://doi.org/10.1007/978-1-935704-36-2_1, 1969. a
Kirkevåg, A., Iversen, T., Seland, Ø., Hoose, C., Kristjánsson, J.
E., Struthers, H., Ekman, A. M. L., Ghan, S., Griesfeller, J., Nilsson, E.
D., and Schulz, M.: Aerosol–climate interactions in the Norwegian Earth
System Model – NorESM1-M, Geosci. Model Dev., 6, 207–244,
https://doi.org/10.5194/gmd-6-207-2013, 2013. a
Kopp, R. E., Simons, F. J., Mitrovica, J. X., Maloof, A. C., and Oppenheimer,
M.: A probabilistic assessment of sea level variations within the last
interglacial stage, Geophys. J. Int., 193, 711–716,
https://doi.org/10.1093/gji/ggt029, 2013. a
Landais, A., Masson-Delmotte, V., Capron, E., Langebroek, P. M., Bakker, P.,
Stone, E. J., Merz, N., Raible, C. C., Fischer, H., Orsi, A., Prié, F.,
Vinther, B., and Dahl-Jensen, D.: How warm was Greenland during the last
interglacial period?, Clim. Past, 12, 1933–1948,
https://doi.org/10.5194/cp-12-1933-2016, 2016. a
Langebroek, P. M. and Nisancioglu, K. H.: Simulating last interglacial
climate with NorESM: role of insolation and greenhouse gases in the timing of
peak warmth, Clim. Past, 10, 1305–1318,
https://doi.org/10.5194/cp-10-1305-2014, 2014. a
Le clec'h, S., Fettweis, X., Quiquet, A., Dumas, C., Kageyama, M., Charbit,
S., Wyard, C., and Ritz, C.: Assessment of the Greenland ice sheet –
atmosphere feedbacks for the next century with a regional atmospheric model
fully coupled to an ice sheet model, The Cryosphere Discuss.,
https://doi.org/10.5194/tc-2017-230, in review, 2017. a, b
Letréguilly, A., Reeh, N., and Huybrechts, P.: The Greenland ice sheet
through the last glacial-interglacial cycle, Palaeogeogr., Palaeocl., 90, 385–394,
https://doi.org/10.1016/S0031-0182(12)80037-X, 1991. a, b, c, d
Lhomme, N., Clarke, G. K. C., and Marshall, S. J.: Tracer transport in the
Greenland Ice Sheet: constraints on ice cores and glacial history,
Quaternary Sci. Rev., 24, 173–194, https://doi.org/10.1016/j.quascirev.2004.08.020, 2005. a, b
Lin, Y.-L., Farley, R. D., and Orville, H. D.: Bulk Parameterization of the
Snow Field in a Cloud Model, J. Clim. Appl.
Meteorol., 22, 1065–1092, https://doi.org/10.1175/1520-0450(1983)022<1065:BPOTSF>2.0.CO;2, 1983. a
Lunt, D. J., Abe-Ouchi, A., Bakker, P., Berger, A., Braconnot, P., Charbit,
S., Fischer, N., Herold, N., Jungclaus, J. H., Khon, V. C., Krebs-Kanzow, U.,
Langebroek, P. M., Lohmann, G., Nisancioglu, K. H., Otto-Bliesner, B. L.,
Park, W., Pfeiffer, M., Phipps, S. J., Prange, M., Rachmayani, R., Renssen,
H., Rosenbloom, N., Schneider, B., Stone, E. J., Takahashi, K., Wei, W., Yin,
Q., and Zhang, Z. S.: A multi-model assessment of last interglacial
temperatures, Clim. Past, 9, 699–717, https://doi.org/10.5194/cp-9-699-2013,
2013. a, b
Maier-Reimer, E.: Geochemical cycles in an ocean general circulation model.
Preindustrial tracer distributions, Global Biogeochem. Cy., 7,
645–677, https://doi.org/10.1029/93GB01355, 1993. a
Maier-Reimer, E., Kriest, I., Segschneider, J., and Wetzel, P.: The HAMburg
Ocean Carbon Cycle Model HAMOCC 5.1 – Technical Description
Release 1.1, Tech. rep., Max Planck Institute for Meteorology, Hamburg,
Germany, available at: http://www.mpimet.mpg.de/fileadmin/publikationen/erdsystem_14.pdf (last access: 17 October 2018), 2005. a
Masson-Delmotte, V., Braconnot, P., Hoffmann, G., Jouzel, J., Kageyama, M.,
Landais, A., Lejeune, Q., Risi, C., Sime, L., Sjolte, J., Swingedouw, D., and
Vinther, B.: Sensitivity of interglacial Greenland temperature and
δ18O: ice core data, orbital and increased CO2 climate
simulations, Clim. Past, 7, 1041–1059,
https://doi.org/10.5194/cp-7-1041-2011, 2011. a
Masson-Delmotte, V., Schulz, M., Abe-Ouchi, A., Beer, J., Ganopolski, A.,
González Rouco, J., Jansen, E., Lambeck, K., Luterbacher, J., Naish, T.,
Osborn, T., Otto-Bliesner, B., Quinn, T., Ramesh, R., Rojas, M., Shao, X.,
and Timmermann, A.: Information from Paleoclimate Archives, in: Climate
Change 2013: The Physical Science Basis. Contribution of
Working Group I to the Fifth Assessment Report of the
Intergovernmental Panel on Climate Change, edited by: Stocker, T. F.,
Qin, D., Plattner, G.-K., Tignor, M., Allen, S. K.,
Boschung, J., Nauels, A., Xia, Y., Bex, V., and
Midgley, P.M.,
383–464, Cambridge University Press, Cambridge, UK
and New York, NY, USA, 2013. a
Mengel, M., Levermann, A., Frieler, K., Robinson, A., Marzeion, B., and
Winkelmann, R.: Future sea level rise constrained by observations and
long-term commitment, P. Natl. Acad. Sci. USA, 113,
2597–2602, https://doi.org/10.1073/pnas.1500515113, 2016. a
Merz, N., Born, A., Raible, C. C., Fischer, H., and Stocker, T. F.:
Dependence of Eemian Greenland temperature reconstructions on the ice sheet
topography, Clim. Past, 10, 1221–1238,
https://doi.org/10.5194/cp-10-1221-2014, 2014a. a
Merz, N., Gfeller, G., Born, A., Raible, C. C., Stocker, T. F., and Fischer,
H.: Influence of ice sheet topography on Greenland precipitation during the
Eemian interglacial, J. Geophys. Res.-Atmos., 119,
10749–10768, https://doi.org/10.1002/2014JD021940,
2014b. a
Merz, N., Born, A., Raible, C. C., and Stocker, T. F.: Warm Greenland during
the last interglacial: the role of regional changes in sea ice cover, Clim.
Past, 12, 2011–2031, https://doi.org/10.5194/cp-12-2011-2016, 2016. a, b
Morcrette, J.-J., Barker, H. W., Cole, J. N. S., Iacono, M. J., and Pincus,
R.:
Impact of a New Radiation Package, McRad, in the ECMWF Integrated
Forecasting System, Mon. Weather Rev., 136, 4773–4798,
https://doi.org/10.1175/2008MWR2363.1, 2008. a
NEEM community members: Eemian interglacial reconstructed from a
Greenland
folded ice core, Nature, 493, 489–494,
https://doi.org/10.1038/nature11789, 2013. a
Otto-Bliesner, B. L., Marshall, S. J., Overpeck, J. T., Miller, G. H., and
Hu,
A.: Simulating Arctic climate warmth and icefield retreat in the last
interglaciation, Science, 311, 1751–1753,
https://doi.org/10.1126/science.1120808, 2006. a, b, c, d
Otto-Bliesner, B. L., Rosenbloom, N., Stone, E. J., McKay, N. P., Lunt,
D. J.,
Brady, E. C., and Overpeck, J. T.: How warm was the last interglacial? New
model–data comparisons, Philos. T. R. Soc. A, 371, 20130097,
https://doi.org/10.1098/rsta.2013.0097, 2013. a
Overpeck, J., Otto-Bliesner, B. L., Miller, G., Muhs, D., Alley, R., and
Kiehl,
J.: Paleoclimatic Evidence for Future Ice-Sheet Instability and
Rapid Sea-Level Rise, Science, 311, 1747–1750,
https://doi.org/10.1126/science.1115159, 2006. a
Past Interglacials Working Group of PAGES: Interglacials of the last
800,000
years, Rev. Geophys., 54, 162–219,
https://doi.org/10.1002/2015RG000482, 2016. a
Quiquet, A., Ritz, C., Punge, H. J., and Salas y Mélia, D.: Greenland ice
sheet contribution to sea level rise during the last interglacial period: a
modelling study driven and constrained by ice core data, Clim. Past, 9,
353–366, https://doi.org/10.5194/cp-9-353-2013, 2013. a, b, c, d
Raynaud, D., Chappellaz, J., Ritz, C., and Martinerie, P.: Air content along
the Greenland Ice Core Project core: A record of surface climatic
parameters and elevation in central Greenland, J. Geophys.
Res.-Oceans, 102, 26607–26613, https://doi.org/10.1029/97JC01908, 1997. a
Ridley, J. K., Huybrechts, P., Gregory, J. M., and Lowe, J. A.: Elimination
of
the Greenland Ice Sheet in a High CO2 Climate, J.
Climate, 18, 3409–3427, https://doi.org/10.1175/JCLI3482.1,
2005. a, b
Ritz, C., Fabre, A., and Letréguilly, A.: Sensitivity of a Greenland
ice
sheet model to ice flow and ablation parameters: consequences for the
evolution through the last climatic cycle, Clim. Dynam., 13, 11–23,
https://doi.org/10.1007/s003820050149, 1997. a, b
Robinson, A. and Goelzer, H.: The importance of insolation changes for paleo
ice sheet modeling, The Cryosphere, 8, 1419–1428,
https://doi.org/10.5194/tc-8-1419-2014, 2014. a
Robinson, A., Calov, R., and Ganopolski, A.: An efficient regional
energy-moisture balance model for simulation of the Greenland Ice Sheet
response to climate change, The Cryosphere, 4, 129–144,
https://doi.org/10.5194/tc-4-129-2010, 2010. a
Schaffer, J., Timmermann, R., Arndt, J. E., Kristensen, S. S., Mayer, C.,
Morlighem, M., and Steinhage, D.: A global, high-resolution data set of ice
sheet topography, cavity geometry, and ocean bathymetry, Earth Syst. Sci.
Data, 8, 543–557, https://doi.org/10.5194/essd-8-543-2016, 2016. a, b
Seguinot, J.: Spatial and seasonal effects of temperature variability in a
positive degree-day glacier surface mass-balance model, J.
Glaciol., 59, 1202–1204, https://doi.org/10.3189/2013JoG13J081, 2013. a
Stone, E. J., Lunt, D. J., Annan, J. D., and Hargreaves, J. C.:
Quantification of the Greenland ice sheet contribution to Last Interglacial
sea level rise, Clim. Past, 9, 621–639,
https://doi.org/10.5194/cp-9-621-2013, 2013. a, b, c, d
Tarasov, L. and Peltier, W. R.: Greenland glacial history, borehole
constraints, and Eemian extent, J. Geophys. Res.-Sol.
Ea., 108, 2143, https://doi.org/10.1029/2001JB001731, 2003. a
Taylor, K. E., Stouffer, R. J., and Meehl, G. A.: An Overview of CMIP5
and
the Experiment Design, B. Am. Meteorol. Soc.,
93, 485–498, https://doi.org/10.1175/BAMS-D-11-00094.1,
2011. a
Van de Berg, W. J., van den Broeke, M., Ettema, J., van Meijgaard, E., and
Kaspar, F.: Significant contribution of insolation to Eemian melting of the
Greenland ice sheet, Nat. Geosci., 4, 679–683,
https://doi.org/10.1038/ngeo1245, 2011. a, b
Vernon, C. L., Bamber, J. L., Box, J. E., van den Broeke, M. R., Fettweis,
X., Hanna, E., and Huybrechts, P.: Surface mass balance model intercomparison
for the Greenland ice sheet, The Cryosphere, 7, 599–614,
https://doi.org/10.5194/tc-7-599-2013, 2013. a
Willerslev, E., Cappellini, E., Boomsma, W., Nielsen, R., Hebsgaard, M. B.,
Brand, T. B., Hofreiter, M., Bunce, M., Poinar, H. N., Dahl-Jensen, D.,
Johnsen, S., Steffensen, J. P., Bennike, O., Schwenninger, J.-L., Nathan, R.,
Armitage, S., Hoog, C.-J. d., Alfimov, V., Christl, M., Beer, J., Muscheler,
R., Barker, J., Sharp, M., Penkman, K. E. H., Haile, J., Taberlet, P.,
Gilbert, M. T. P., Casoli, A., Campani, E., and Collins, M. J.: Ancient
Biomolecules from Deep Ice Cores Reveal a Forested Southern
Greenland, Science, 317, 111–114, https://doi.org/10.1126/science.1141758, 2007.
a
Yin, Q. and Berger, A.: Interglacial analogues of the Holocene and its
natural near future, Quaternary Sci. Rev., 120, 28–46,
https://doi.org/10.1016/j.quascirev.2015.04.008, 2015. a, b
Yin, Q. Z. and Berger, A.: Insolation and CO2 contribution to the
interglacial climate before and after the Mid-Brunhes Event, Nat.
Geosci., 3, 243–246, https://doi.org/10.1038/ngeo771,
2010. a
Short summary
The Greenland ice sheet is a huge frozen water reservoir which is crucial for predictions of sea level in a warming future climate. Therefore, computer models are needed to reliably simulate the melt of ice sheets. In this study, we use climate model simulations of the last period where it was warmer than today in Greenland. We test different melt models under these climatic conditions and show that the melt models show very different results under these warmer conditions.
The Greenland ice sheet is a huge frozen water reservoir which is crucial for predictions of sea...
