Articles | Volume 22, issue 10
https://doi.org/10.5194/cp-22-1881-2026
© Author(s) 2026. 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-22-1881-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Review article
| 
08 Oct 2026
Review article |
| 08 Oct 2026
| 08 Oct 2026
Antarctic sea ice over the past 130 000 years – Part 2: A review of its role in the Earth system
Institute of Marine and Antarctic Studies and Australian Centre for Excellence in Antarctic Science, University of Tasmania, Hobart, Australia
Karen E. Kohfeld
School of Resource and Environmental Management and School of Environmental Science, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5V 1S6, Canada
Amy Leventer
Department of Earth and Environmental Geosciences, Colgate University, Hamilton, NY, USA
David Lund
Department of Marine Sciences, University of Connecticut, Groton, CT, USA
Xavier Crosta
EPOC, Université de Bordeaux, CNRS, Bordeaux INP, UMR 5805, 33615 Pessac, France
Laurie Menviel
Climate Change Research Centre and Australian Centre for Excellence in Antarctic Science, University of New South Wales, Sydney, Australia
Helen C. Bostock
School of the Environment, The University of Queensland, Brisbane, Australia
Matthew Chadwick
British Antarctic Survey, Cambridge, United Kingdom
Samuel L. Jaccard
Institute of Earth Sciences, University of Lausanne, Switzerland
Jacob Jones
School of Resource and Environmental Management and School of Environmental Science, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5V 1S6, Canada
Department of Geography, University of California, Los Angeles, CA, USA
Alice Marzocchi
National Oceanography Centre, Southampton, United Kingdom
Katrin J. Meissner
Climate Change Research Centre and ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, Australia
Elisabeth Sikes
Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, USA
Louise C. Sime
Ice Dynamics and Paleoclimate, British Antarctic Survey, Cambridge, United Kingdom
Luke Skinner
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom
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Amy I. Hsieh, Thierry Adatte, Shraddha Band, Li Lo, Romain Vaucher, Brahimsamba Bomou, Laszlo Kocsis, Pei-Ling Wang, and Samuel Jaccard
Clim. Past, 22, 227–246, https://doi.org/10.5194/cp-22-227-2026, https://doi.org/10.5194/cp-22-227-2026, 2026
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Andrés S. Rigual-Hernández, Amy Leventer, Manuel Fernández-Barba, José A. Flores, Gabriel Navarro, Johan Etourneau, Dimitris Evangelinos, Megan Duffy, Carlota Escutia, Fernando Bohoyo, José M. Sánchez-Santos, Manon Sabourdy, Francisco J. Jiménez-Espejo, and María A. Bárcena
Biogeosciences, 22, 7205–7232, https://doi.org/10.5194/bg-22-7205-2025, https://doi.org/10.5194/bg-22-7205-2025, 2025
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Alison J. McLaren, Louise C. Sime, Simon Wilson, Jeff Ridley, Qinggang Gao, Merve Gorguner, Giorgia Line, Martin Werner, and Paul Valdes
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Louise C. Sime, Rahul Sivankutty, Irene Malmierca-Vallet, Sentia Goursaud Oger, Allegra N. LeGrande, Erin L. McClymont, Agatha de Boer, Alexandre Cauquoin, and Martin Werner
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Takashi Obase, Laurie Menviel, Ayako Abe-Ouchi, Tristan Vadsaria, Ruza Ivanovic, Brooke Snoll, Sam Sherriff-Tadano, Paul J. Valdes, Lauren Gregoire, Marie-Luise Kapsch, Uwe Mikolajewicz, Nathaelle Bouttes, Didier Roche, Fanny Lhardy, Chengfei He, Bette Otto-Bliesner, Zhengyu Liu, and Wing-Le Chan
Clim. Past, 21, 1443–1463, https://doi.org/10.5194/cp-21-1443-2025, https://doi.org/10.5194/cp-21-1443-2025, 2025
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Jennifer Cocks, Alessandro Silvano, Alberto C. Naveira Garabato, Oana Dragomir, Noémie Schifano, Anna E. Hogg, and Alice Marzocchi
Ocean Sci., 21, 1609–1625, https://doi.org/10.5194/os-21-1609-2025, https://doi.org/10.5194/os-21-1609-2025, 2025
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Bartholomé Duboc, Katrin J. Meissner, Laurie Menviel, Nicholas K. H. Yeung, Babette Hoogakker, Tilo Ziehn, and Matthew Chamberlain
Clim. Past, 21, 1093–1122, https://doi.org/10.5194/cp-21-1093-2025, https://doi.org/10.5194/cp-21-1093-2025, 2025
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We use an earth system model to simulate ocean oxygen during two past warm periods, the Last Interglacial (∼ 129–115 ka) and Marine Isotope Stage (MIS) 9e (∼ 336–321 ka). The global ocean is overall less oxygenated compared to the preindustrial simulation. Large regions in the Mediterranean Sea are oxygen deprived in the Last Interglacial simulation, and to a lesser extent in the MIS 9e simulation, due to an intensification and expansion of the African monsoon and enhanced river runoff.
Gabriel M. Pontes, Pedro L. da Silva Dias, and Laurie Menviel
Clim. Past, 21, 1079–1091, https://doi.org/10.5194/cp-21-1079-2025, https://doi.org/10.5194/cp-21-1079-2025, 2025
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Megan Jeffers, Christopher C. Chapman, Bernadette M. Sloyan, and Helen Bostock
Ocean Sci., 21, 537–554, https://doi.org/10.5194/os-21-537-2025, https://doi.org/10.5194/os-21-537-2025, 2025
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This study analyses physical and biogeochemical data collected in the East Australian Current (EAC) to understand variability in the nutrient-poor surface waters. The distribution of nutrients in the water column is influenced by seasonal flow and the EAC's position. An inshore EAC has a deeper nutricline and lower nutrient concentrations compared to an offshore EAC position. This has implications for the marine ecosystems along the coastline.
Babette A.A. Hoogakker, Catherine Davis, Yi Wang, Stephanie Kusch, Katrina Nilsson-Kerr, Dalton S. Hardisty, Allison Jacobel, Dharma Reyes Macaya, Nicolaas Glock, Sha Ni, Julio Sepúlveda, Abby Ren, Alexandra Auderset, Anya V. Hess, Katrin J. Meissner, Jorge Cardich, Robert Anderson, Christine Barras, Chandranath Basak, Harold J. Bradbury, Inda Brinkmann, Alexis Castillo, Madelyn Cook, Kassandra Costa, Constance Choquel, Paula Diz, Jonas Donnenfield, Felix J. Elling, Zeynep Erdem, Helena L. Filipsson, Sebastián Garrido, Julia Gottschalk, Anjaly Govindankutty Menon, Jeroen Groeneveld, Christian Hallmann, Ingrid Hendy, Rick Hennekam, Wanyi Lu, Jean Lynch-Stieglitz, Lélia Matos, Alfredo Martínez-García, Giulia Molina, Práxedes Muñoz, Simone Moretti, Jennifer Morford, Sophie Nuber, Svetlana Radionovskaya, Morgan Reed Raven, Christopher J. Somes, Anja S. Studer, Kazuyo Tachikawa, Raúl Tapia, Martin Tetard, Tyler Vollmer, Xingchen Wang, Shuzhuang Wu, Yan Zhang, Xin-Yuan Zheng, and Yuxin Zhou
Biogeosciences, 22, 863–957, https://doi.org/10.5194/bg-22-863-2025, https://doi.org/10.5194/bg-22-863-2025, 2025
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Qinggang Gao, Emilie Capron, Louise C. Sime, Rachael H. Rhodes, Rahul Sivankutty, Xu Zhang, Bette L. Otto-Bliesner, and Martin Werner
Clim. Past, 21, 419–440, https://doi.org/10.5194/cp-21-419-2025, https://doi.org/10.5194/cp-21-419-2025, 2025
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Marine sediment and ice core records suggest a warmer Southern Ocean and Antarctica at the early last interglacial, ~127 000 years ago. However, when only forced by orbital parameters and greenhouse gas concentrations during that period, state-of-the-art climate models do not reproduce the magnitude of warming. Here we show that much of the warming at southern middle to high latitudes can be reproduced by a UK climate model, HadCM3, with a 3000-year freshwater forcing over the North Atlantic.
Sentia Goursaud Oger, Louise C. Sime, and Max Holloway
Clim. Past, 20, 2539–2560, https://doi.org/10.5194/cp-20-2539-2024, https://doi.org/10.5194/cp-20-2539-2024, 2024
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Antarctic ice cores provide information about past temperatures. Here, we run new climate model simulations, including stable water isotopes for the historical period. Across one-third of Antarctica, there is no strong connection between isotopes and temperature and a weak connection for most of the rest of Antarctica. This disconnect between isotopes and temperature is largely driven by changes in Antarctic sea ice. Our results are helpful for temperature reconstructions from ice core records.
John Slattery, Louise C. Sime, Francesco Muschitiello, and Keno Riechers
Clim. Past, 20, 2431–2454, https://doi.org/10.5194/cp-20-2431-2024, https://doi.org/10.5194/cp-20-2431-2024, 2024
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Dansgaard–Oeschger events are a series of abrupt past climate change events during which the atmosphere, sea ice, and ocean in the North Atlantic underwent rapid changes. One current topic of interest is the order in which these different changes occurred, which remains unknown. In this work, we find that the current best method used to investigate this topic is subject to substantial bias. This implies that it is not possible to reliably determine the order of the different changes.
Ana-Cristina Mârza, Laurie Menviel, and Luke C. Skinner
Geochronology, 6, 503–519, https://doi.org/10.5194/gchron-6-503-2024, https://doi.org/10.5194/gchron-6-503-2024, 2024
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Radiocarbon serves as a powerful dating tool, but the calibration of marine radiocarbon dates presents significant challenges because the whole surface ocean cannot be represented by a single calibration curve. Here we use climate model outputs and data to assess a novel method for developing regional marine calibration curves. Our results are encouraging and point to a way forward for solving the marine radiocarbon age calibration problem without relying on model simulations of the past.
Raffaella Tolotti, Amy Leventer, Federica Donda, Leanne Armand, Taryn Noble, Phil O'Brien, Xiang Zhao, David Heslop, Alix Post, Roberto Romeo, Andrea Caburlotto, Diego Cotterle, and Nicola Corradi
J. Micropalaeontol., 43, 349–382, https://doi.org/10.5194/jm-43-349-2024, https://doi.org/10.5194/jm-43-349-2024, 2024
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New tephra layer and microsiliceous assemblages are identified. Sediment records are contextualized for the Sabrina Coast continental rise chronological and paleoclimatic context. Some in-depth studies on margin instabilities, tephrochronology, and biostratigraphic/paleoenvironmental and sedimentary evolution are suggested. We performed this study to implement knowledge on the Antarctic biochronostratigraphy and microsiliceous sedimentation and benefited from international-level collaboration.
Joseph A. Ruggiero, Reed P. Scherer, Joseph Mastro, Cesar G. Lopez, Marcus Angus, Evie Unger-Harquail, Olivia Quartz, Amy Leventer, and Claus-Dieter Hillenbrand
J. Micropalaeontol., 43, 323–336, https://doi.org/10.5194/jm-43-323-2024, https://doi.org/10.5194/jm-43-323-2024, 2024
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We quantify sea surface temperature (SST) in the past Southern Ocean using the diatom Fragilariopsis kerguelensis that displays variable population with SST. We explore the use of this relatively new proxy by applying it to sediment assemblages from the Sabrina Coast and Amundsen Sea. We find that Amundsen Sea and Sabrina Coast F. kerguelensis populations are different from each other. An understanding of F. kerguelensis dynamics may help us generate an SST proxy to apply to ancient sediments.
Aaron Ferderer, Kai G. Schulz, Ulf Riebesell, Kirralee G. Baker, Zanna Chase, and Lennart T. Bach
Biogeosciences, 21, 2777–2794, https://doi.org/10.5194/bg-21-2777-2024, https://doi.org/10.5194/bg-21-2777-2024, 2024
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Ocean alkalinity enhancement (OAE) is a promising method of atmospheric carbon removal; however, its ecological impacts remain largely unknown. We assessed the effects of simulated silicate- and calcium-based mineral OAE on diatom silicification. We found that increased silicate concentrations from silicate-based OAE increased diatom silicification. In contrast, the enhancement of alkalinity had no effect on community silicification and minimal effects on the silicification of different genera.
Brooke Snoll, Ruza Ivanovic, Lauren Gregoire, Sam Sherriff-Tadano, Laurie Menviel, Takashi Obase, Ayako Abe-Ouchi, Nathaelle Bouttes, Chengfei He, Feng He, Marie Kapsch, Uwe Mikolajewicz, Juan Muglia, and Paul Valdes
Clim. Past, 20, 789–815, https://doi.org/10.5194/cp-20-789-2024, https://doi.org/10.5194/cp-20-789-2024, 2024
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Geological records show rapid climate change throughout the recent deglaciation. The drivers of these changes are still misunderstood but are often attributed to shifts in the Atlantic Ocean circulation from meltwater input. A cumulative effort to understand these processes prompted numerous simulations of this period. We use these to explain the chain of events and our collective ability to simulate them. The results demonstrate the importance of the meltwater amount used in the simulation.
Eleanor Simpson, Debby Ianson, Karen E. Kohfeld, Ana C. Franco, Paul A. Covert, Marty Davelaar, and Yves Perreault
Biogeosciences, 21, 1323–1353, https://doi.org/10.5194/bg-21-1323-2024, https://doi.org/10.5194/bg-21-1323-2024, 2024
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Shellfish aquaculture operates in nearshore areas where data on ocean acidification parameters are limited. We show daily and seasonal variability in pH and saturation states of calcium carbonate at nearshore aquaculture sites in British Columbia, Canada, and determine the contributing drivers of this variability. We find that nearshore locations have greater variability than open waters and that the uptake of carbon by phytoplankton is the major driver of pH and saturation state variability.
Phoebe A. Hudson, Adrien C. H. Martin, Simon A. Josey, Alice Marzocchi, and Athanasios Angeloudis
Ocean Sci., 20, 341–367, https://doi.org/10.5194/os-20-341-2024, https://doi.org/10.5194/os-20-341-2024, 2024
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Satellite salinity data are used for the first time to study variability in Arctic freshwater transport from the Lena River and are shown to be a valuable tool for studying this region. These data confirm east/westerly wind is the main control on fresh water and sea ice transport rather than the volume of river runoff. The strong role of the wind suggests understanding how wind patterns will change is key to predicting future Arctic circulation and sea ice concentration.
Qinggang Gao, Louise C. Sime, Alison J. McLaren, Thomas J. Bracegirdle, Emilie Capron, Rachael H. Rhodes, Hans Christian Steen-Larsen, Xiaoxu Shi, and Martin Werner
The Cryosphere, 18, 683–703, https://doi.org/10.5194/tc-18-683-2024, https://doi.org/10.5194/tc-18-683-2024, 2024
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Antarctic precipitation is a crucial component of the climate system. Its spatio-temporal variability impacts sea level changes and the interpretation of water isotope measurements in ice cores. To better understand its climatic drivers, we developed water tracers in an atmospheric model to identify moisture source conditions from which precipitation originates. We find that mid-latitude surface winds exert an important control on moisture availability for Antarctic precipitation.
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.
Laurie C. Menviel, Paul Spence, Andrew E. Kiss, Matthew A. Chamberlain, Hakase Hayashida, Matthew H. England, and Darryn Waugh
Biogeosciences, 20, 4413–4431, https://doi.org/10.5194/bg-20-4413-2023, https://doi.org/10.5194/bg-20-4413-2023, 2023
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As the ocean absorbs 25% of the anthropogenic emissions of carbon, it is important to understand the impact of climate change on the flux of carbon between the ocean and the atmosphere. Here, we use a very high-resolution ocean, sea-ice, carbon cycle model to show that the capability of the Southern Ocean to uptake CO2 has decreased over the last 40 years due to a strengthening and poleward shift of the southern hemispheric westerlies. This trend is expected to continue over the coming century.
Luke Skinner, Francois Primeau, Aurich Jeltsch-Thömmes, Fortunat Joos, Peter Köhler, and Edouard Bard
Clim. Past, 19, 2177–2202, https://doi.org/10.5194/cp-19-2177-2023, https://doi.org/10.5194/cp-19-2177-2023, 2023
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Radiocarbon is best known as a dating tool, but it also allows us to track CO2 exchange between the ocean and atmosphere. Using decades of data and novel mapping methods, we have charted the ocean’s average radiocarbon ″age” since the last Ice Age. Combined with climate model simulations, these data quantify the ocean’s role in atmospheric CO2 rise since the last Ice Age while also revealing that Earth likely received far more cosmic radiation during the last Ice Age than hitherto believed.
Himadri Saini, Katrin J. Meissner, Laurie Menviel, and Karin Kvale
Clim. Past, 19, 1559–1584, https://doi.org/10.5194/cp-19-1559-2023, https://doi.org/10.5194/cp-19-1559-2023, 2023
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Understanding the changes in atmospheric CO2 during the last glacial cycle is crucial to comprehend the impact of climate change in the future. Previous research has hypothesised a key role of greater aeolian iron input into the Southern Ocean in influencing the global atmospheric CO2 levels by impacting the changes in the marine phytoplankton response. In our study, we test this iron hypothesis using climate modelling and constrain the impact of ocean iron supply on global CO2 decrease.
Maria-Elena Vorrath, Juliane Müller, Paola Cárdenas, Thomas Opel, Sebastian Mieruch, Oliver Esper, Lester Lembke-Jene, Johan Etourneau, Andrea Vieth-Hillebrand, Niko Lahajnar, Carina B. Lange, Amy Leventer, Dimitris Evangelinos, Carlota Escutia, and Gesine Mollenhauer
Clim. Past, 19, 1061–1079, https://doi.org/10.5194/cp-19-1061-2023, https://doi.org/10.5194/cp-19-1061-2023, 2023
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Sea ice is important to stabilize the ice sheet in Antarctica. To understand how the global climate and sea ice were related in the past we looked at ancient molecules (IPSO25) from sea-ice algae and other species whose dead cells accumulated on the ocean floor over time. With chemical analyses we could reconstruct the history of sea ice and ocean temperatures of the past 14 000 years. We found out that sea ice became less as the ocean warmed, and more phytoplankton grew towards today's level.
Irene Malmierca-Vallet, Louise C. Sime, and the D–O community members
Clim. Past, 19, 915–942, https://doi.org/10.5194/cp-19-915-2023, https://doi.org/10.5194/cp-19-915-2023, 2023
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Greenland ice core records feature Dansgaard–Oeschger (D–O) events, abrupt warming episodes followed by a gradual-cooling phase during mid-glacial periods. There is uncertainty whether current climate models can effectively represent the processes that cause D–O events. Here, we propose a Marine Isotopic Stage 3 (MIS3) baseline protocol which is intended to provide modelling groups investigating D–O oscillations with a common framework.
Louise C. Sime, Rahul Sivankutty, Irene Vallet-Malmierca, Agatha M. de Boer, and Marie Sicard
Clim. Past, 19, 883–900, https://doi.org/10.5194/cp-19-883-2023, https://doi.org/10.5194/cp-19-883-2023, 2023
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It is not known if the Last Interglacial (LIG) experienced Arctic summers that were sea ice free: models show a wide spread in LIG Arctic temperature and sea ice results. Evaluation against sea ice markers is hampered by few observations. Here, an assessment of 11 climate model simulations against summer temperatures shows that the most skilful models have a 74 %–79 % reduction in LIG sea ice. The measurements of LIG areas indicate a likely mix of ice-free and near-ice-free LIG summers.
Maria Vittoria Guarino, Louise C. Sime, Rachel Diamond, Jeff Ridley, and David Schroeder
Clim. Past, 19, 865–881, https://doi.org/10.5194/cp-19-865-2023, https://doi.org/10.5194/cp-19-865-2023, 2023
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We investigate the response of the atmosphere, ocean, and ice domains to the release of a large volume of glacial meltwaters thought to have occurred during the Last Interglacial period. We show that the signal that originated in the North Atlantic travels over great distances across the globe. It modifies the ocean gyre circulation in the Northern Hemisphere as well as the belt of westerly winds in the Southern Hemisphere, with consequences for Antarctic sea ice.
David A. Hodell, Simon J. Crowhurst, Lucas Lourens, Vasiliki Margari, John Nicolson, James E. Rolfe, Luke C. Skinner, Nicola C. Thomas, Polychronis C. Tzedakis, Maryline J. Mleneck-Vautravers, and Eric W. Wolff
Clim. Past, 19, 607–636, https://doi.org/10.5194/cp-19-607-2023, https://doi.org/10.5194/cp-19-607-2023, 2023
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We produced a 1.5-million-year-long history of climate change at International Ocean Discovery Program Site U1385 of the Iberian margin, a well-known location for rapidly accumulating sediments on the seafloor. Our record demonstrates that longer-term orbital changes in Earth's climate were persistently overprinted by abrupt millennial-to-centennial climate variability. The occurrence of abrupt climate change is modulated by the slower variations in Earth's orbit and climate background state.
Lea Pesjak, Andrew McMinn, Zanna Chase, and Helen Bostock
Clim. Past, 19, 419–437, https://doi.org/10.5194/cp-19-419-2023, https://doi.org/10.5194/cp-19-419-2023, 2023
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This study uses diatom assemblages, biogenic silica and Si/Al data over the last 140 kyr from core TAN1302-44 (64°54' S, 144°32' E) to define glacial-to-interglacial paleoenvironments near Antarctica with respect to sea ice duration and ocean circulation. It has found that the sea ice season increased gradually during the last glacial, reaching a maximum before decreasing at the end of MIS 2. Following this, Circumpolar Deep Water increased relative to other times prior to ice sheet retreat.
Stephen G. Chastain, Karen E. Kohfeld, Marlow G. Pellatt, Carolina Olid, and Maija Gailis
Biogeosciences, 19, 5751–5777, https://doi.org/10.5194/bg-19-5751-2022, https://doi.org/10.5194/bg-19-5751-2022, 2022
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Salt marshes are thought to be important carbon sinks because of their ability to store carbon in their soils. We provide the first estimates of how much blue carbon is stored in salt marshes on the Pacific coast of Canada. We find that the carbon stored in the marshes is low compared to other marshes around the world, likely because of their young age. Still, the high marshes take up carbon at rates faster than the global average, making them potentially important carbon sinks in the future.
Aaron Ferderer, Zanna Chase, Fraser Kennedy, Kai G. Schulz, and Lennart T. Bach
Biogeosciences, 19, 5375–5399, https://doi.org/10.5194/bg-19-5375-2022, https://doi.org/10.5194/bg-19-5375-2022, 2022
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Ocean alkalinity enhancement has the capacity to remove vast quantities of carbon from the atmosphere, but its effect on marine ecosystems is largely unknown. We assessed the effect of increased alkalinity on a coastal phytoplankton community when seawater was equilibrated and not equilibrated with atmospheric CO2. We found that the phytoplankton community was moderately affected by increased alkalinity and equilibration with atmospheric CO2 had little influence on this effect.
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.
Stefan Mulitza, Torsten Bickert, Helen C. Bostock, Cristiano M. Chiessi, Barbara Donner, Aline Govin, Naomi Harada, Enqing Huang, Heather Johnstone, Henning Kuhnert, Michael Langner, Frank Lamy, Lester Lembke-Jene, Lorraine Lisiecki, Jean Lynch-Stieglitz, Lars Max, Mahyar Mohtadi, Gesine Mollenhauer, Juan Muglia, Dirk Nürnberg, André Paul, Carsten Rühlemann, Janne Repschläger, Rajeev Saraswat, Andreas Schmittner, Elisabeth L. Sikes, Robert F. Spielhagen, and Ralf Tiedemann
Earth Syst. Sci. Data, 14, 2553–2611, https://doi.org/10.5194/essd-14-2553-2022, https://doi.org/10.5194/essd-14-2553-2022, 2022
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Stable isotope ratios of foraminiferal shells from deep-sea sediments preserve key information on the variability of ocean circulation and ice volume. We present the first global atlas of harmonized raw downcore oxygen and carbon isotope ratios of various planktonic and benthic foraminiferal species. The atlas is a foundation for the analyses of the history of Earth system components, for finding future coring sites, and for teaching marine stratigraphy and paleoceanography.
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.
Dipayan Choudhury, Laurie Menviel, Katrin J. Meissner, Nicholas K. H. Yeung, Matthew Chamberlain, and Tilo Ziehn
Clim. Past, 18, 507–523, https://doi.org/10.5194/cp-18-507-2022, https://doi.org/10.5194/cp-18-507-2022, 2022
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We investigate the effects of a warmer climate from the Earth's paleoclimate (last interglacial) on the marine carbon cycle of the Southern Ocean using a carbon-cycle-enabled state-of-the-art climate model. We find a 150 % increase in CO2 outgassing during this period, which results from competition between higher sea surface temperatures and weaker oceanic circulation. From this we unequivocally infer that the carbon uptake by the Southern Ocean will reduce under a future warming scenario.
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.
Erin L. McClymont, Michael J. Bentley, Dominic A. Hodgson, Charlotte L. Spencer-Jones, Thomas Wardley, Martin D. West, Ian W. Croudace, Sonja Berg, Darren R. Gröcke, Gerhard Kuhn, Stewart S. R. Jamieson, Louise Sime, and Richard A. Phillips
Clim. Past, 18, 381–403, https://doi.org/10.5194/cp-18-381-2022, https://doi.org/10.5194/cp-18-381-2022, 2022
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Sea ice is important for our climate system and for the unique ecosystems it supports. We present a novel way to understand past Antarctic sea-ice ecosystems: using the regurgitated stomach contents of snow petrels, which nest above the ice sheet but feed in the sea ice. During a time when sea ice was more extensive than today (24 000–30 000 years ago), we show that snow petrel diet had varying contributions of fish and krill, which we interpret to show changing sea-ice distribution.
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.
Karin Kvale, David P. Keller, Wolfgang Koeve, Katrin J. Meissner, Christopher J. Somes, Wanxuan Yao, and Andreas Oschlies
Geosci. Model Dev., 14, 7255–7285, https://doi.org/10.5194/gmd-14-7255-2021, https://doi.org/10.5194/gmd-14-7255-2021, 2021
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We present a new model of biological marine silicate cycling for the University of Victoria Earth System Climate Model (UVic ESCM). This new model adds diatoms, which are a key aspect of the biological carbon pump, to an existing ecosystem model. Our modifications change how the model responds to warming, with net primary production declining more strongly than in previous versions. Diatoms in particular are simulated to decline with climate warming due to their high nutrient requirements.
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.
Rachel Diamond, Louise C. Sime, David Schroeder, and Maria-Vittoria Guarino
The Cryosphere, 15, 5099–5114, https://doi.org/10.5194/tc-15-5099-2021, https://doi.org/10.5194/tc-15-5099-2021, 2021
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The Hadley Centre Global Environment Model version 3 (HadGEM3) is the first coupled climate model to simulate an ice-free summer Arctic during the Last Interglacial (LIG), 127 000 years ago, and yields accurate Arctic surface temperatures. We investigate the causes and impacts of this extreme simulated ice loss and, in particular, the role of melt ponds.
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.
Cited articles
Abernathey, R. P., Cerovecki, I., Holland, P. R., Newsom, E., Mazloff, M., and Talley, L. D.: Water-mass transformation by sea ice in the upper branch of the Southern Ocean overturning, Nat. Geosci., 9, 596–601, https://doi.org/10.1038/ngeo2749, 2016.
Abram, N. J., Purich, A., England, M. H., McCormack, F. S., Strugnell, J. M., Bergstrom, D. M., Vance, T. R., Stål, T., Wienecke, B., Heil, P., Doddridge, E. W., Sallée, J.-B., Williams, T. J., Reading, A. M., Mackintosh, A., Reese, R., Winkelmann, R., Klose, A. K., Boyd, P. W., Chown, S. L., and Robinson, S. A.: Emerging evidence of abrupt changes in the Antarctic environment, Nature, 644, 621–633. https://doi.org/10.1038/s41586-025-09349-5, 2025.
Adkins, J. F., McIntyre, K., and Schrag, D. P.: The salinity, temperature, and delta18O of the glacial deep ocean, Science, 298, 1769–1773, https://doi.org/10.1126/science.1076252, 2002.
Aguiar, W., Morrison, A. K., Huneke, W. G. C., Hutchinson, D. K., Spence, P., Hogg, A. McC., Colombo, P., and Stewart, K. D.: Antarctic Dense Water Formation Sensitivity to Ocean Surface Cell Thickness, J. Adv. Model Earth Sy., 17, e2024MS004913, https://doi.org/10.1029/2024MS004913, 2025.
Ai, X. E., Studer, A. S., Sigman, D. M., Martínez-García, A., Fripiat, F., Schmitt, M., Oleynik, S., Jaccard, S. L., and Haug, G. H.: Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change, Science, 370, 1348–1352, 2020.
Alley, R. B.: Ice-core evidence of abrupt climate changes, P. Natl. Acad. Sci. USA, 97, 1331–1334, https://doi.org/10.1073/pnas.97.4.1331, 2000.
Almeida, L., Mazloff, M. R., and Mata, M. M.: The Influence of Surface Fluxes on Export of Southern Ocean Intermediate and Mode Water in Coupled Climate Models, J. Geophys. Res.-Oceans, 129, e2024JC021841, https://doi.org/10.1029/2024JC021841, 2024.
Amsler, H. E., Thöle, L. M., Stimac, I., Geibert, W., Ikehara, M., Kuhn, G., Esper, O., and Jaccard, S. L.: Bottom water oxygenation changes in the southwestern Indian Ocean as an indicator for enhanced respired carbon storage since the last glacial inception, Clim. Past, 18, 1797–1813, https://doi.org/10.5194/cp-18-1797-2022, 2022.
Anderson, H. J., Chase, Z., Bostock, H. C., Noble, T. L., Shuttleworth, R., Taiapa, B., Chen, W. H., Ren, H., and Jacobsen, G. E.: Millennial‐scale carbon flux variability in the Subantarctic Pacific during Marine Isotope Stage 3 (57–29 ka), Paleoceanography and Paleoclimatology, 39, e2023PA004776, https://doi.org/10.1029/2023PA004776, 2024.
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.
Anderson, R. F., Sachs, J. P., Fleisher, M. Q., Allen, K. A., Yu, J., Koutavas, A., and Jaccard, S. L.: Deep-Sea oxygen depletion and ocean carbon sequestration during the last ice age, Global Biogeochem. Cy., 33, 301–317, https://doi.org/10.1029/2018GB006049, 2019.
Archer, D. E., Martin, P. A., Milovich, J., Brovkin, V., Plattner, G.-K., and Ashendel, C.: Model sensitivity in the effect of Antarctic sea ice and stratification on atmospheric pCO2, Paleoceanography, 18, https://doi.org/10.1029/2002PA000760, 2003.
Armbrecht, L. H.: The potential of sedimentary ancient DNA to reconstruct past ocean ecosystems, Oceanography, 33, 116–123, https://doi.org/10.5670/oceanog.2020.211, 2020.
Arrigo, K. R., Van Dijken, G. L., and Strong, A. L.: Environmental controls of marine productivity hot spots around Antarctica, J. Geophys. Res.-Oceans, 120, 5545–5565, https://doi.org/10.1002/2015JC010888, 2015.
Arrigo, K. R., Worthen, D. L., Lizotte, M. P., Dixon, P., and Dieckmann, G.: Primary production in Antarctic sea ice, Science, 276, 394–397, https://doi.org/10.1126/science.276.5311.394, 1997.
Arrigo, K. R.: Sea Ice Ecosystems, Annu. Rev. Mar. Sci., 6, 439–467, https://doi.org/10.1146/annurev-marine-010213-135103, 2014.
Ashley, K. E., McKay, R., Etourneau, J., Jimenez-Espejo, F. J., Condron, A., Albot, A., Crosta, X., Riesselman, C., Seki, O., Massé, G., Golledge, N. R., Gasson, E., Lowry, D. P., Barrand, N. E., Johnson, K., Bertler, N., Escutia, C., Dunbar, R., and Bendle, J. A.: Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat, Clim. Past, 17, 1–19, https://doi.org/10.5194/cp-17-1-2021, 2021.
Ayres, H. C., Screen, J. A., Blockley, E. W., and Bracegirdle, T. J.: The coupled atmosphere–ocean response to Antarctic sea ice loss, J. Climate, 35, 4665–4685, https://doi.org/10.1175/JCLI-D-21-0918.1, 2022.
Bareille, G., Labracherie, M., Bertrand, P., Labeyrie, L., Lavaux, G., and Dignan, M.: Glacial-interglacial changes in the accumulation rates of major biogenic components in Southern Indian Ocean sediments, J. Marine Syst., 17, 527–539, 1998.
Barkley, A. E., Winckler, G., Recasens, C., Kaplan, M. R., Koffman, B. G., Calabozo, F., Middleton, J. L., Anderson, R. F., Cai, Y., Bolge, L., Longman, J., and Goldstein, S. L.: Patagonian dust, Agulhas Current, and Antarctic ice-rafted debris contributions to the South Atlantic Ocean over the past 150,000 years, P. Natl. Acad. Sci. USA, 121, e2402120121, https://doi.org/10.1073/pnas.2402120121, 2024.
Bassis, J. N., Berg, B., Crawford, A. J., and Benn, D. I.: Transition to marine ice cliff instability controlled by ice thickness gradients and velocity, Science, 372, 1342–1344, https://doi.org/10.1126/science.abf6271, 2021.
Bentley, M. J., Ocofaigh, C., Anderson, J. B., Conway, H., Davies, B., Graham, A. G. C., Hillenbrand, C. D., Hodgson, D. A., Jamieson, S. S. R., Larter, R. D., Mackintosh, A., Smith, J. A., Verleyen, E., Ackert, R. P., Bart, P. J., Berg, S., Brunstein, D., Canals, M., Colhoun, E. A., Crosta, X., Dickens, W. A., Domack, E., Dowdeswell, J. A., Dunbar, R., Ehrmann, W., Evans, J., Favier, V., Fink, D., Fogwill, C. J., Glasser, N. F., Gohl, K., Golledge, N. R., Goodwin, I., Gore, D. B., Greenwood, S. L., Hall, B. L., Hall, K., Hedding, D. W., Hein, A. S., Hocking, E. P., Jakobsson, M., Johnson, J. S., Jomelli, V., Jones, R. S., Klages, J. P., Kristoffersen, Y., Kuhn, G., Leventer, A., Licht, K., Lilly, K., Lindow, J., Livingstone, S. J., Massé, G., McGlone, M. S., McKay, R. M., Melles, M., Miura, H., Mulvaney, R., Nel, W., Nitsche, F. O., O'Brien, P. E., Post, A. L., Roberts, S. J., Saunders, K. M., Selkirk, P. M., Simms, A. R., Spiegel, C., Stolldorf, T. D., Sugden, D. E., van der Putten, N., van Ommen, T., Verfaillie, D., Vyverman, W., Wagner, B., White, D. A., Witus, A. E., and Zwartz, D.: A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum, Quaternary Sci. Rev., 100, 1–9, https://doi.org/10.1016/j.quascirev.2014.06.025, 2014.
Benz, V., Esper, O., Gersonde, R., Lamy, F., and Tiedemann, R.: Last Glacial Maximum sea surface temperature and sea-ice extent in the Pacific sector of the Southern Ocean, Quaternary Sci. Rev., 146, 216–237, https://doi.org/10.1016/j.quascirev.2016.06.006, 2016.
Bereiter, B., Eggleston, S., Schmitt, J., Nehrbass-Ahles, C., Stocker, T. F., Fischer, H., Kipfstuhl, S., and Chappellaz, J.: Revision of the EPICA Dome C CO2 record from 800 to 600 kyr before present, Geophys. Res. Lett., 42, https://doi.org/10.1002/2014GL061957, 2015.
Berends, C. J., de Boer, B., and van de Wal, R. S. W.: Reconstructing the evolution of ice sheets, sea level, and atmospheric CO2 during the past 3.6 million years, Clim. Past, 17, 361–377, https://doi.org/10.5194/cp-17-361-2021, 2021.
Blaser, P., Waelbroeck, C., Thornalley, D. J. R., Lippold, J., Pöppelmeier, F., Kaboth-Bahr, S., Repschläger, J., and Jaccard, S. L.: Prevalent North Atlantic Deep Water during the Last Glacial Maximum and Heinrich Stadial 1, Nat. Geosci., 18, 410–416, https://doi.org/10.1038/s41561-025-01685-5, 2025.
Bouttes, N., Paillard, D., and Roche, D. M.: Impact of brine-induced stratification on the glacial carbon cycle, Clim. Past, 6, 575–589, https://doi.org/10.5194/cp-6-575-2010, 2010.
Broeker, W.: The Great Ocean Conveyor, Oceanography, 4, 79–89, https://doi.org/10.5670/oceanog.1991.07, 1991.
Bromirski, P. D., Sergienko, O. V., and MacAyeal, D. R.: Transoceanic infragravity waves impacting Antarctic ice shelves, Geophys. Res. Lett., 37, L02502, https://doi.org/10.1029/2009GL041488, 2010.
Buiron, D., Stenni, B., Chappellaz, J., Landais, A., Baumgartner, M., Bonazza, M., Capron, E., Frezzotti, M., Kageyama, M., Lemieux-Dudon, B., Masson-Delmotte, V., Parrenin, F., Schilt, A., Selmo, E., Severi, M., Swingedouw, D., and Udisti, R.: Regional imprints of millennial variability during the MIS 3 period around Antarctica, Quaternary Sci. Rev., 48, 99–112, https://doi.org/10.1016/j.quascirev.2012.05.023, 2012.
Buizert, C., Adrian, B., Ahn, J., Albert, M., Alley, R. B., Baggenstos, D., Bauska, T. K., Bay, R. C., Bencivengo, B. B., Bentley, C. R., Brook, E. J., Chellman, N. J., Clow, G. D., Cole-Dai, J., Conway, H., Cravens, E., Cuffey, K. M., Dunbar, N. W., Edwards, J. S., Fegyveresi, J. M., Ferris, D. G., Fitzpatrick, J. J., Fudge, T. J., Gibson, C. J., Gkinis, V., Goetz, J. J., Gregory, S., Hargreaves, G. M., Iverson, N., Johnson, J. A., Jones, T. R., Kalk, M. L., Kippenhan, M. J., Koffman, B. G., Kreutz, K., Kuhl, T. W., Lebar, D. A., Lee, J. E., Marcott, S. A., Markle, B. R., Maselli, O. J., McConnell, J. R., McGwire, K. C., Mitchell, L. E., Mortensen, N. B., Neff, P. D., Nishiizumi, K., Nunn, R. M., Orsi, A. J., Pasteris, D. R., Pedro, J. B., Pettit, E. C., Price, P. B., Priscu, J. C., Rhodes, R. H., Rosen, J. L., Schauer, A. J., Schoenemann, S. W., Sendelbach, P. J., Severinghaus, J. P., Shturmakov, A. J., Sigl, M., Slawny, K. R., Souney, J. M., Sowers, T. A., Spencer, M. K., Steig, E. J., Taylor, K. C., Twickler, M. S., Vaughn, B. H., Voigt, D. E., Waddington, E. D., Welten, K. C., Wendricks, A. W., White, J. W. C., Winstrup, M., Wong, G. J., and Woodruff, T. E.: Precise interpolar phasing of abrupt climate change during the last ice age, Nature, 520, 661–665, https://doi.org/10.1038/nature14401, 2015.
Buizert, C., Sigl, M., Severi, M., Markle, B. R., Wettstein, J. J., McConnell, J. R., Pedro, J. B., Sodemann, H., Goto-Azuma, K., Kawamura, K., Fujita, S., Motoyama, H., Hirabayashi, M., Uemura, R., Stenni, B., Parrenin, F., He, F., Fudge, T. J., and Steig, E. J.: Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north, Nature, 563, 681–685, https://doi.org/10.1038/s41586-018-0727-5, 2018.
Burckle, L. H. and Cirilli, J.: Origin of diatom ooze belt in the Southern Ocean: Implications for late Quaternary paleoceanography, Micropaleontology, 33, 82–86, 1987.
Burckle, L. H., Robinson, D., and Cooke, D.: Reappraisal of sea-ice distribution in Atlantic and Pacific sectors of the Southern Ocean at 18,000 yr BP, Nature, 299, 435–437, https://doi.org/10.1038/299435a0, 1982.
Butterworth, B. J. and Miller, S. D.: Air-Sea Carbon Dioxide Exchange in the Southern Ocean and Antarctic Sea Ice Zone, Geophys. Res. Lett., 43, 7223–7230, https://doi.org/10.1002/2016GL069581, 2016.
Caburlotto, A., Lucchi, R. G., de Santis, L., Macrì, P., and Tolotti, R.: Sedimentary processes on the Wilkes Land continental rise reflect changes in glacial dynamic and bottom water flow, Int. J. Earth Sci., 99, 909–926, https://doi.org/10.1007/s00531-009-0422-8, 2010.
Capron, E., Govin, A., Feng, R., Otto-Bliesner, B. L., and Wolff, E. W.: Critical evaluation of climate syntheses to benchmark CMIP6/PMIP4 127 ka Last Interglacial simulations in the high-latitude regions, Quaternary Sci. Rev., 168, 137–150, https://doi.org/10.1016/j.quascirev.2017.04.019, 2017.
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.
Chadwick, M., Allen, C. S., Sime, L. C., and Hillenbrand, C. D.: Analysing the timing of peak warming and minimum winter sea-ice extent in the Southern Ocean during MIS 5e, Quaternary Sci. Rev., 229, 106134–106134, https://doi.org/10.1016/j.quascirev.2019.106134, 2020.
Chadwick, M., Allen, C. S., Sime, L. C., Crosta, X., and Hillenbrand, C.-D.: How does the Southern Ocean palaeoenvironment during Marine Isotope Stage 5e compare to the modern?, Mar. Micropaleontol., 170, 102066, https://doi.org/10.1016/j.marmicro.2021.102066, 2022a.
Chadwick, M., Allen, C. S., Sime, L. C., Crosta, X., and Hillenbrand, C.-D.: Reconstructing Antarctic winter sea-ice extent during Marine Isotope Stage 5e, Clim. Past, 18, 129–146, https://doi.org/10.5194/cp-18-129-2022, 2022b.
Chadwick, M., Crosta, X., Esper, O., Thöle, L., and Kohfeld, K. E.: Compilation of Southern Ocean sea-ice records covering the last glacial-interglacial cycle (12–130 ka), Clim. Past, 18, 1815–1829, https://doi.org/10.5194/cp-18-1815-2022, 2022c.
Chadwick, M., Sime, L. C., Allen, C. S., and Guarino, M. ‐V.: Model‐Data Comparison of Antarctic Winter Sea‐Ice Extent and Southern Ocean Sea‐Surface Temperatures During Marine Isotope Stage 5e, Paleoceanography and Paleoclimatology, 38, e2022PA004600, https://doi.org/10.1029/2022PA004600, 2023.
Chandler, D. and Langebroek, P.: Southern Ocean sea surface temperature synthesis: Part 2. Penultimate glacial and last interglacial, Quaternary Sci. Rev., 271, 107190, https://doi.org/10.1016/j.quascirev.2021.107190, 2021.
Charlson, R. J., Lovelock, J. E., Andreae, M. O., and Warren, S. G.: Oceanic phytoplankton, atmospheric sulphur, cloud albedo and climate, Nature, 326, 655–661, https://doi.org/10.1038/326655a0, 1987.
Chase, Z., Anderson, R. F., Fleisher, M. Q., and Kubik, P. W.: Accumulation of biogenic and lithogenic material in the Pacific sector of the Southern Ocean during the past 40,000 years, Deep-Sea Res. Pt. II, 50, 799–832, https://doi.org/10.1016/S0967-0645(02)00595-7, 2003.
Chase, Z., Kohfeld, K. E., and Matsumoto, K.: Controls on biogenic silica burial in the Southern Ocean, Global Biogeochem. Cy., 29, https://doi.org/10.1002/2015GB005186, 2015.
Chen, Z., Hobbs, W., Chase, Z., and Zika, J.: The impact of Antarctic sea ice on Southern Ocean water mass transformation in coupled climate models, J. Geophys. Res.-Oceans, 130, e2025JC022445, https://doi.org/10.1029/2025JC022445, 2025.
Christie, F. D. W., Benham, T. J., Batchelor, C. L., Rack, W., Montelli, A., and Dowdeswell, J. A.: Antarctic ice-shelf advance driven by anomalous atmospheric and sea-ice circulation, Nat. Geosci., 15, 356–362, https://doi.org/10.1038/s41561-022-00938-x, 2022.
Civel-Mazens, M., Crosta, X., Cortese, G., Lowe, V., Itaki, T., Ikehara, M., and Kohfeld, K.: Subantarctic jet migrations regulate vertical mixing in the Southern Indian, Earth Planet. Sc. Lett., 642, 118877, https://doi.org/10.1016/j.epsl.2024.118877, 2024.
Cooke, D. W. and Hays, J. D.: Estimates of Antarctic Ocean seasonal sea-ice cover during glacial intervals, in: Antarctic geoscience, 3rd symposium on Antarctic geology and geophysics, Madison, August 1977, edited by: Craddock, C., University of Wisconsin Press, Madison, Wisconsin, 1017–1025, ISBN 10: 0299084108/ISBN 13: 9780299084103, 1982.
Crespin, J., Yam, R., Crosta, X., Massé, G., Schmidt, S., Campagne, P., and Shemesh, A.: Holocene glacial discharge fluctuations and recent instability in East Antarctica, Earth Planet. Sc. Lett., 394, 38–47, https://doi.org/10.1016/j.epsl.2014.03.009, 2014.
Crosta, X., Crespin, J., Swingedouw, D., Marti, O., Masson-Delmotte, V., Etourneau, J., Goosse, H., Braconnot, P., Yam, R., Brailovski, I., and Shemesh, A.: Ocean as the main driver of Antarctic ice sheet retreat during the Holocene, Global Planet. Change, 166, 62–74, https://doi.org/10.1016/j.gloplacha.2018.04.007, 2018.
Crosta, X., Kohfeld, K. E., Bostock, H. C., Chadwick, M., Du Vivier, A., Esper, O., Etourneau, J., Jones, J., Leventer, A., Müller, J., Rhodes, R. H., Allen, C. S., Ghadi, P., Lamping, N., Lange, C. B., Lawler, K.-A., Lund, D., Marzocchi, A., Meissner, K. J., Menviel, L., Nair, A., Patterson, M., Pike, J., Prebble, J. G., Riesselman, C., Sadatzki, H., Sime, L. C., Shukla, S. K., Thöle, L., Vorrath, M.-E., Xiao, W., and Yang, J.: Antarctic sea ice over the past 130 000 years – Part 1: a review of what proxy records tell us, Clim. Past, 18, 1729–1756, https://doi.org/10.5194/cp-18-1729-2022, 2022.
Curry, W. B. and Oppo, D. W.: Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean, Paleoceanography, 20, 1–12, https://doi.org/10.1029/2004PA001021, 2005.
De Lavergne, C., Palter, J. B., Galbraith, E. D., Bernardello, R., and Marinov, I.: Cessation of deep convection in the open Southern Ocean under anthropogenic climate change, Nat. Clim. Change, 4, 278–282, https://doi.org/10.1038/nclimate2132, 2014.
DeConto, R. M. and Pollard, D.: Contribution of Antarctica to past and future sea-level rise, Nature, 531, 591–597, https://doi.org/10.1038/nature17145, 2016.
DeConto, R., Pollard, D., and Harwood, D.: Sea ice feedback and Cenozoic evolution of Antarctic climate and ice sheets, Paleoceanography, 22, 2006PA001350, https://doi.org/10.1029/2006PA001350, 2007.
Denis, D., Crosta, X., Barbara, L., Massé, G., Renssen, H., Ther, O., and Giraudeau, J.: Sea ice and wind variability during the Holocene in East Antarctica: insight on middle–high latitude coupling, Quaternary Sci. Rev., 29, 3709–3719, https://doi.org/10.1016/j.quascirev.2010.08.007, 2010.
Deppeler, S. L. and Davidson, A. T.: Southern Ocean phytoplankton in a changing climate, Frontiers in Marine Science, 4, 3228–3285, https://doi.org/10.3389/fmars.2017.00040, 2017.
Deser, C., Tomas, R. A., and Sun, L.: The Role of Ocean–Atmosphere Coupling in the Zonal-Mean Atmospheric Response to Arctic Sea Ice Loss, J. Climate, 28, 2168–2186, https://doi.org/10.1175/JCLI-D-14-00325.1, 2015.
Eayrs, C., Li, X., Raphael, M. N., and Holland, D. M.: Rapid decline in Antarctic sea ice in recent years hints at future change, Nat. Geosci., 14, 460–464, https://doi.org/10.1038/s41561-021-00768-3, 2021.
Eggleston, S. and Galbraith, E. D.: The devil's in the disequilibrium: multi-component analysis of dissolved carbon and oxygen changes under a broad range of forcings in a general circulation model, Biogeosciences, 15, 3761–3777, https://doi.org/10.5194/bg-15-3761-2018, 2018.
England, M. R., Polvani, L. M., Sun, L., and Deser, C.: Tropical climate responses to projected Arctic and Antarctic sea-ice loss, Nat. Geosci., 13, 275–281, https://doi.org/10.1038/s41561-020-0546-9, 2020.
England, M. R., Eisenman, I., and Wagner, T. J. W.: Spurious Climate Impacts in Coupled Sea Ice Loss Simulations, J. Climate, 35, 7401–7411, https://doi.org/10.1175/JCLI-D-21-0647.1, 2022.
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.
Ferrari, R., Jansen, M. F., Adkins, J. F., Burke, A., Stewart, A. L., and Thompson, A. F.: Antarctic sea ice control on ocean circulation in present and glacial climates, P. Natl. Acad. Sci. USA, 111, 8753–8758, https://doi.org/10.1073/pnas.1323922111, 2014.
Ferreira, D., Marshall, J., Ito, T., and McGee, D.: Linking Glacial-Interglacial States to Multiple Equilibria of Climate, Geophys. Res. Lett., 45, 9160–9170, https://doi.org/10.1029/2018GL077019, 2018.
Fischer, H., Burke, A., Rae, J., Sugden, P. J., Erhardt, T., Twarloh, B., Hörhold, M., Freitag, J., Markle, B., Severi, M., Hansson, M., Savarino, J., Pryer, H., Doyle, E., and Wolff, E.: Limited decrease of Southern Ocean sulfur productivity across the penultimate termination, Nat. Geosci., 18, 160–166, https://doi.org/10.1038/s41561-024-01619-7, 2025.
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.
Fox-Kemper, B., H.T. Hewitt, C. Xiao, G. Aðalgeirsdóttir, S.S. Drijfhout, T.L. Edwards, N.R. Golledge, M. Hemer, R.E. Kopp, G. Krinner, A. Mix, D. Notz, S. Nowicki, I.S. Nurhati, L. Ruiz, J.-B. Sallée, A.B.A. Slangen, and Y. Yu, 2021: Ocean, Cryosphere and Sea Level Change, in: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Masson-Delmotte, V., Zhai, P., Pirani, A., Connors, S. L., Péan, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M. I., Huang, M., Leitzell, K., Lonnoy, E., Matthews, J. B. R., Maycock, T. K., Waterfield, T., Yelekçi, O., Yu, R., and Zhou, B., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1211–1362, https://doi.org/10.1017/9781009157896.011, 2021.
Francois, R., Altabet, M. A., Yu, E. F., Sigman, D. M., Bacon, M. P., Frank, M., Bohrmann, G., Bareille, G., and Labeyrie, L. D.: Contribution of Southern Ocean surface-water stratification to low atmospheric CO2 concentrations during the last glacial period, Nature, 389, 929–935, 1997.
Fürst, J. J., Durand, G., Gillet-Chaulet, F., Tavard, L., Rankl, M., Braun, M., and Gagliardini, O.: The safety band of Antarctic ice shelves, Nat. Clim. Change, 6, 479–482, https://doi.org/10.1038/nclimate2912, 2016.
Galbraith, E. and de Lavergne, C.: Response of a comprehensive climate model to a broad range of external forcings: relevance for deep ocean ventilation and the development of late Cenozoic ice ages, Clim.e Dynam., 52, 653–679, https://doi.org/10.1007/s00382-018-4157-8, 2019.
Gao, Q., Capron, E., Sime, L. C., Rhodes, R. H., Sivankutty, R., Zhang, X., Otto-Bliesner, B. L., and Werner, M.: Assessment of the southern polar and subpolar warming in the PMIP4 last interglacial simulations using paleoclimate data syntheses, Clim. Past, 21, 419–440, https://doi.org/10.5194/cp-21-419-2025, 2025.
Garity, M. L. and Lund, D. C.: Progressively greater biological carbon storage in the deep Atlantic during glacial inception, P. Natl. Acad. Sci. USA, 122, e2510171122, https://doi.org/10.1073/pnas.2510171122, 2025.
Gersonde, R., Crosta, X., Abelmann, A., and Armand, L.: Sea-surface temperature and sea ice distribution of the Southern Ocean at the EPILOG Last Glacial Maximum – a circum-Antarctic view based on siliceous microfossil records, Quaternary Sci. Rev., 24, 869–896, 2005.
Ghadi, P., Nair, A., Crosta, X., Mohan, R., Manoj, M. C., and Meloth, T.: Antarctic sea-ice and palaeoproductivity variation over the last 156,000 years in the Indian sector of Southern Ocean, Mar. Micropaleontol., 160, 101894–101894, https://doi.org/10.1016/j.marmicro.2020.101894, 2020.
Giddy, I. S., Nicholson, S.-A., Queste, B. Y., Thomalla, S., and Swart, S.: Sea-Ice Impacts Inter-Annual Variability of Phytoplankton Bloom Characteristics and Carbon Export in the Weddell Sea, Geophys. Res. Lett., 50, e2023GL103695, https://doi.org/10.1029/2023GL103695, 2023.
Gordon, A. L.: Oceanography: Southern Ocean polynya, Nat. Clim. Change, 4, 249–250, https://doi.org/10.1038/nclimate2179, 2014.
Gottschalk, J., Battaglia, G., Fischer, H., Frölicher, T. L., Jaccard, S. L., Jeltsch-Thömmes, A., Joos, F., Köhler, P., Meissner, K. J., Menviel, L., Nehrbass-Ahles, C., Schmitt, J., Schmittner, A., Skinner, L. C., and Stocker, T. F.: Mechanisms of millennial-scale atmospheric CO2 change in numerical model simulations, Quaternary Sci. Rev., 220, 30–74, https://doi.org/10.1016/j.quascirev.2019.05.013, 2019.
Goyal, R., Sen Gupta, A., Jucker, M., and England, M. H.: Historical and Projected Changes in the Southern Hemisphere Surface Westerlies, Geophys. Res. Lett., 48, e2020GL090849, https://doi.org/10.1029/2020GL090849, 2021.
Gray, W. R., De Lavergne, C., Jnglin Wills, R. C., Menviel, L., Spence, P., Holzer, M., Kageyama, M., and Michel, E.: Poleward Shift in the Southern Hemisphere Westerly Winds Synchronous With the Deglacial Rise in CO2, Paleoceanography and Paleoclimatology, 38, e2023PA004666, https://doi.org/10.1029/2023PA004666, 2023.
Green, R. A., Menviel, L., Meissner, K. J., Crosta, X., Chandan, D., Lohmann, G., Peltier, W. R., Shi, X., and Zhu, J.: Evaluating seasonal sea-ice cover over the Southern Ocean at the Last Glacial Maximum, Clim. Past, 18, 845–862, https://doi.org/10.5194/cp-18-845-2022, 2022.
Gudmundsson, G. H.: Ice-shelf buttressing and the stability of marine ice sheets, The Cryosphere, 7, 647–655, https://doi.org/10.5194/tc-7-647-2013, 2013.
Gupta, M., Follows, M. J., and Lauderdale, J. M.: The Effect of Antarctic Sea Ice on Southern Ocean Carbon Outgassing: Capping versus Light Attenuation, Global Biogeochem. Cy., 34, e2019GB006489, https://doi.org/10.1029/2019GB006489, 2020.
Haddam, N. A., Michel, E., Siani, G., Licari, L., and Dewilde, F.: Ventilation and Expansion of Intermediate and Deep Waters in the Southeast Pacific During the Last Termination, Paleoceanography and Paleoclimatology, 35, e2019PA003743, https://doi.org/10.1029/2019PA003743, 2020.
Hayes, C. T., Martínez-García, A., Hasenfratz, A. P., Jaccard, S. L., Hodell, D. A., Sigman, D. M., Haug, G. H., and Anderson, R. F.: A stagnation event in the deep south atlantic during the last interglacial period, Science, 346, 1514–1517, https://doi.org/10.1126/science.1256620, 2014.
Hillenbrand, C.-D., Kuhn, G., and Frederichs, T.: Record of a Mid-Pleistocene depositional anomaly in West Antarctic continental margin sediments: an indicator for ice-sheet collapse?, Quaternary Sci. Rev., 28, 1147–1159, https://doi.org/10.1016/j.quascirev.2008.12.010, 2009.
Hines, S. K. V., Thompson, A. F., and Adkins, J. F.: The Role of the Southern Ocean in Abrupt Transitions and Hysteresis in Glacial Ocean Circulation, Paleoceanography and Paleoclimatology, 34, 490–510, https://doi.org/10.1029/2018PA003415, 2019.
Hoffman, J. L. and Lund, D. C.: Refining the stable isotope budget for Antarctic Bottom Water: New foraminiferal data from the abyssal southwest Atlantic, Paleoceanography, 27, PA1213, https://doi.org/10.1029/2011PA002216, 2012.
Hoffman, J. S., Clark, P. U., Parnell, A. C., and He, F.: Regional and global sea-surface temperatures during the last interglaciation, Science, 355, 276–279, https://doi.org/10.1126/science.aai8464, 2017.
Holder, L., Duffy, M., Opdyke, B., Leventer, A., Post, A., O'Brien, P., and Armand, L. K.: Controls Since the mid‐Pleistocene Transition on Sedimentation and Primary Productivity Downslope of Totten Glacier, East Antarctica, Paleoceanography and Paleoclimatology, 35, e2020PA003981, https://doi.org/10.1029/2020PA003981, 2020.
Holloway, M. D., Sime, L. C., Singarayer, J. S., Tindall, J. C., Bunch, P., and Valdes, P. J.: Antarctic last interglacial isotope peak in response to sea ice retreat not ice-sheet collapse, Nat. Commun., 7, 12293, https://doi.org/10.1038/ncomms12293, 2016.
Holloway, M. D., Sime, L. C., Allen, C. S., Hillenbrand, C., Bunch, P., Wolff, E., and Valdes, P. J.: The Spatial Structure of the 128 ka Antarctic Sea Ice Minimum, Geophys. Res. Lett., 44, https://doi.org/10.1002/2017GL074594, 2017.
Hu, R., Piotrowski, A. M., Bostock, H. C., Crowhurst, S., and Rennie, V.: Variability of neodymium isotopes associated with planktonic foraminifera in the Pacific Ocean during the Holocene and Last Glacial Maximum, Earth Planet. Sc. Lett., 447, 130–138, https://doi.org/10.1016/j.epsl.2016.05.011, 2016.
Huang, H., Gutjahr, M., Eisenhauer, A., and Kuhn, G.: No detectable Weddell Sea Antarctic Bottom Water export during the Last and Penultimate Glacial Maximum, Nat. Commun., 11, 1–10, https://doi.org/10.1038/s41467-020-14302-3, 2020.
Huiskamp, W. and McGregor, S.: Quantifying Southern Annular Mode paleo-reconstruction skill in a model framework, Clim. Past, 17, 1819–1839, https://doi.org/10.5194/cp-17-1819-2021, 2021.
Jaccard, S. L. and Galbraith, E. D.: Large climate-driven changes of oceanic oxygen concentrations during the last deglaciation, Nat. Geosci., 5, 151–156, https://doi.org/10.1038/ngeo1352, 2012.
Jaccard, S. L., Hayes, C. T., Martínez-García, A., Hodell, D. A., Anderson, R. F., Sigman, D. M., and Haug, G. H.: Two modes of change in Southern Ocean productivity over the past million years, Science, 339, 1419–1423, https://doi.org/10.1126/science.1227545, 2013.
Jaccard, S. L., Galbraith, E. D., Martínez-Garciá, A., and Anderson, R. F.: Covariation of deep Southern Ocean oxygenation and atmospheric CO2 through the last ice age, Nature, 530, 207–210, https://doi.org/10.1038/nature16514, 2016.
Jacobs, S. S., Helmer, H. H., Doake, C. S. M., Jenkins, A., and Frolich, R. M.: Melting of ice shelves and the mass balance of Antarctica, J. Glaciol., 38, 375–387, https://doi.org/10.3189/S0022143000002252, 1992.
Jansen, M. F.: Glacial ocean circulation and stratification explained by reduced atmospheric temperature, P. Natl. Acad. Sci. USA, 114, 45–50, https://doi.org/10.1073/pnas.1610438113, 2017.
Jansen, M. F. and Nadeau, L. P.: The effect of Southern Ocean surface buoyancy loss on the deep-ocean circulation and stratification, J. Phys. Oceanogr., 46, 3455–3470, https://doi.org/10.1175/JPO-D-16-0084.1, 2016.
Jimenez-Espejo, F. J., Presti, M., Kuhn, G., Mckay, R., Crosta, X., Escutia, C., Lucchi, R. G., Tolotti, R., Yoshimura, T., Ortega Huertas, M., Macrì, P., Caburlotto, A., and De Santis, L.: Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments, Global Planet. Change, 184, 103045–103045, https://doi.org/10.1016/j.gloplacha.2019.103045, 2020.
Jones, J., Kohfeld, K. E., Bostock, H., Crosta, X., Liston, M., Dunbar, G., Chase, Z., Leventer, A., Anderson, H., and Jacobsen, G.: Sea ice changes in the southwest Pacific sector of the Southern Ocean during the last 140 000 years, Clim. Past, 18, 465–483, https://doi.org/10.5194/cp-18-465-2022, 2022.
Jourdain, N. C., Mathiot, P., Merino, N., Durand, G., Le Sommer, J., Spence, P., Dutrieux, P., and Madec, G.: Ocean circulation and sea-ice thinning induced by melting ice shelves in the Amundsen Sea, J. Geophys. Res.-Oceans, 122, 2550–2573, https://doi.org/10.1002/2016JC012509, 2017.
Kattner, G., Thomas, D., Haas, C., Kennedy, H., and Dieckmann, G.: Surface ice and gap layers in Antarctic sea ice: highly productive habitats, Mar. Ecol. Prog. Ser., 277, 1–12, https://doi.org/10.3354/meps277001, 2004.
Kaufmann, P., Fundel, F., Fischer, H., Bigler, M., Ruth, U., Udisti, R., Hansson, M., de Angelis, M., Barbante, C., and Wolff, E. W.: Ammonium and non-sea salt sulfate in the EPICA ice cores as indicator of biological activity in the Southern Ocean, Quaternary Sci. Rev., 29, 313–323, https://doi.org/10.1016/j.quascirev.2009.11.009, 2010.
Khatiwala, S., Schmittner, A., and Muglia, J.: Air-sea disequilibrium enhances ocean carbon storage during glacial periods, Sci. Adv., 5, eaaw4981, https://doi.org/10.1126/sciadv.aaw4981, 2019.
Kidston, J., Taschetto, A. S., Thompson, D. W. J., and England, M. H.: The influence of Southern Hemisphere sea‐ice extent on the latitude of the mid‐latitude jet stream, Geophys. Res. Lett., 38, 2011GL048056, https://doi.org/10.1029/2011GL048056, 2011.
Kim, J. H., Crosta, X., Willmott, V., Renssen, H., Bonnin, J., Helmke, P., Schouten, S., and Sinninghe Damsté, J. S.: Holocene subsurface temperature variability in the eastern Antarctic continental margin, Geophys. Res. Lett., 39, L06705, https://doi.org/10.1029/2012GL051157, 2012.
Kirst, G. O., Thiel, C., Wolff, H., Nothnagel, J., Wanzek, M., and Ulmke, R.: Dimethylsulfoniopropionate (DMSP) in icealgae and its possible biological role, Mar. Chem., 35, 381–388, https://doi.org/10.1016/S0304-4203(09)90030-5, 1991.
Kohfeld, K. E. and Chase, Z.: Temporal evolution of mechanisms controlling ocean carbon uptake during the last glacial cycle, Earth Planet. Sci. Lett., 472, https://doi.org/10.1016/j.epsl.2017.05.015, 2017.
Kohfeld, K. E. and Ridgwell, A.: Glacial-Interglacial Variability in Atmospheric CO2, Geophysical Research Series, 187, 251–286, https://doi.org/10.1029/2008GM000845, 2009.
Kohfeld, K. E., Harrison, S. P., Que, C. L., Anderson, R. F., and Quere, C. L.: Role of Marine Biology in Glacial-Interglacial CO2 Cycles, Science, 308, 74–78, 2005.
Kohfeld, K. E., Graham, R. M., de Boer, A. M., Sime, L. C., Wolff, E. W., Le Quéré, C., and Bopp, L.: Southern Hemisphere westerly wind changes during the Last Glacial Maximum: Paleo-data synthesis, Quaternary Sci. Rev., 68, 76–95, https://doi.org/10.1016/j.quascirev.2013.01.017, 2013.
Kurahashi-Nakamura, T., Abe‐Ouchi, A., Yamanaka, Y., and Misumi, K.: Compound effects of Antarctic sea ice on atmospheric pCO2 change during glacial–interglacial cycle, Geophys. Res. Lett., 34, 2007GL030898, https://doi.org/10.1029/2007GL030898, 2007.
Kusahara, K., Tatebe, H., Hajima, T., Saito, F., and Kawamiya, M.: Antarctic Sea Ice Holds the Fate of Antarctic Ice-Shelf Basal Melting in a Warming Climate, J. Climate, 36, 713–743, https://doi.org/10.1175/JCLI-D-22-0079.1, 2023.
Lamboll, R. D., Nicholls, Z. R. J., Smith, C. J., Kikstra, J. S., Byers, E., and Rogelj, J.: Assessing the size and uncertainty of remaining carbon budgets, Nat. Clim. Change, 13, 1360–1367, https://doi.org/10.1038/s41558-023-01848-5, 2023.
Lamping, N., Müller, J., Esper, O., Hillenbrand, C.-D., Smith, J. A., and Kuhn, G.: Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica, Quaternary Sci. Rev., 228, 106103, https://doi.org/10.1016/j.quascirev.2019.106103, 2020.
Lana, A., Bell, T. G., Simó, R., Vallina, S. M., Ballabrera-Poy, J., Kettle, A. J., Dachs, J., Bopp, L., Saltzman, E. S., Stefels, J., Johnson, J. E., and Liss, P. S.: An updated climatology of surface dimethlysulfide concentrations and emission fluxes in the global ocean, Global Biogeochem. Cy., 25, GB1004, https://doi.org/10.1029/2010GB003850, 2011.
Lannuzel, D., Fourquez, M., De Jong, J., Tison, J.-L., Delille, B., and Schoemann, V.: First report on biological iron uptake in the Antarctic sea-ice environment, Polar Biol., 46, 339–355, https://doi.org/10.1007/s00300-023-03127-7, 2023.
Lannuzel, D., Schoemann, V., De Jong, J., Chou, L., Delille, B., Becquevort, S., and Tison, J.-L.: Iron study during a time series in the western Weddell pack ice, Mar. Chem., 108, 85–95, https://doi.org/10.1016/j.marchem.2007.10.006, 2008.
Lannuzel, D., Vancoppenolle, M., Van Der Merwe, P., De Jong, J., Meiners, K. M., Grotti, M., Nishioka, J., and Schoemann, V.: Iron in sea ice: Review and new insights, Elementa, 4, 119–130, https://doi.org/10.12952/journal.elementa.000130, 2016.
Lauber, J., Hattermann, T., De Steur, L., Darelius, E., Auger, M., Nøst, O. A., and Moholdt, G.: Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice, Nat. Geosci., 16, 877–885, https://doi.org/10.1038/s41561-023-01273-5, 2023.
Leventer, A.: The fate of sea ice diatoms and their use as paleoenvironmental indicators, in: American Geophysical Union Antarctic Research Series 73, Antarctic Sea Ice: Biological Processes, 73, 121–137, 1998.
Levine, J. G., Yang, X., Jones, A. E., and Wolff, E. W.: Sea salt as an ice core proxy for past sea ice extent: A process‐based model study, J. Geophys. Res.-Atmos., 119, 5737–5756, https://doi.org/10.1002/2013JD020925, 2014.
Lhardy, F., Bouttes, N., Roche, D. M., Crosta, X., Waelbroeck, C., and Paillard, D.: Impact of Southern Ocean surface conditions on deep ocean circulation during the LGM: a model analysis, Clim. Past, 17, 1139–1159, https://doi.org/10.5194/cp-17-1139-2021, 2021.
Li, L., Liu, Z., Zhu, C., He, C., and Otto-Bliesner, B.: Shallowing Glacial Antarctic Intermediate Water by Changes in Sea Ice and Hydrological Cycle, Geophys. Res. Lett., 48, e2021GL094317, https://doi.org/10.1029/2021GL094317, 2021.
Lisiecki, L. E. and Raymo, M. E.: A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records, Paleoceanography, 20, 1–17, https://doi.org/10.1029/2004PA001071, 2005.
Loose, B. and Schlosser, P.: Sea ice and its effect on CO2 flux between the atmosphere and the Southern Ocean interior, J. Geophys. Res.-Oceans, 116, C11019, https://doi.org/10.1029/2010JC006509, 2011.
Loose, B., Lovely, A., Schlosser, P., Zappa, C., Mcgillis, W., and Perovich, D.: Currents and convection cause enhanced gas exchange in the ice-water boundary layer, Tellus B, 68, https://doi.org/10.3402/tellusb.v68.32803, 2016.
Loose, B., McGillis, W. R., Perovich, D., Zappa, C. J., and Schlosser, P.: A parameter model of gas exchange for the seasonal sea ice zone, Ocean Sci., 10, 17–28, https://doi.org/10.5194/os-10-17-2014, 2014.
Lynch-Stieglitz, J., Adkins, J. F., Curry, W. B., Dokken, T., Hall, I. R., Herguera, J. C., Hirschi, J. J.-M., Ivanova, E. V., Kissel, C., Marchal, O., Marchitto, T. M., McCave, I. N., McManus, J. F., Mulitza, S., Ninnemann, U., Peeters, F., Yu, E.-F., and Zahn, R.: Atlantic Meridional Overturning Circulation During the Last Glacial Maximum, Science, 316, 66–69, https://doi.org/10.1126/science.1137127, 2007.
Mackintosh, A. N., Verleyen, E., O'Brien, P. E., White, D. A., Jones, R. S., McKay, R., Dunbar, R., Gore, D. B., Fink, D., Post, A. L., Miura, H., Leventer, A., Goodwin, I., Hodgson, D. A., Lilly, K., Crosta, X., Golledge, N. R., Wagner, B., Berg, S., van Ommen, T., Zwartz, D., Roberts, S. J., Vyverman, W., and Masse, G.: Retreat history of the East Antarctic Ice Sheet since the Last Glacial Maximum, Quaternary Sci. Rev., 100, 10–30, https://doi.org/10.1016/j.quascirev.2013.07.024, 2014.
Malin, G. and Erst, G. O.: Algal production of dimethylsulfide and its atmospheric role, J. Phycol., 33, 889–896, https://doi.org/10.1111/j.0022-3646.1997.00889.x, 1997.
Malyarenko, A., Robinson, N. J., Williams, M. J. M., and Langhorne, P. J.: A Wedge Mechanism for Summer Surface Water Inflow Into the Ross Ice Shelf Cavity, J. Geophys. Res.-Oceans, 124, 1196–1214, https://doi.org/10.1029/2018JC014594, 2019.
Markle, B. R., Steig, E. J., Buizert, C., Schoenemann, S. W., Bitz, C. M., Fudge, T. J., Pedro, J. B., Ding, Q., Jones, T. R., White, J. W. C., and Sowers, T.: Global atmospheric teleconnections during Dansgaard–Oeschger events, Nat. Geosci., 10, 36–40, https://doi.org/10.1038/ngeo2848, 2017.
Marshall, J. and Speer, K.: Closure of the meridional overturning circulation through Southern Ocean upwelling, Nat. Geosci., 5, 171–180, https://doi.org/10.1038/ngeo1391, 2012.
Martinez-Garcia, Claquin, T., Roelandt, C., et al.: Iron Fertilization of the Subantarctic Ocean During the Last Ice Age, Science, 343, 1347–1350, https://doi.org/10.1126/science.1246848, 2014.
Martínez-Méndez, G., Hebbeln, D., Mohtadi, M., Lamy, F., De Pol-Holz, R., Reyes-Macaya, D., and Freudenthal, T.: Changes in the advection of Antarctic Intermediate Water to the northern Chilean coast during the last 970 kyr, Paleoceanography, 28, 607–618, https://doi.org/10.1002/palo.20047, 2013.
Marzocchi, A. and Jansen, M. F.: Global cooling linked to increased glacial carbon storage via changes in Antarctic sea ice, Nat. Geosci., 12, 1001–1005, https://doi.org/10.1038/s41561-019-0466-8, 2019.
Massom, R. A., Scambos, T. A., Bennetts, L. G., Reid, P., Squire, V. A., and Stammerjohn, S. E.: Antarctic ice shelf disintegration triggered by sea ice loss and ocean swell, Nature, 558, 383–389, https://doi.org/10.1038/s41586-018-0212-1, 2018.
Matsumoto, K., Chase, Z., and Kohfeld, K.: Different mechanisms of silicic acid leakage and their biogeochemical consequences, Paleoceanography, 29, https://doi.org/10.1002/2013PA002588, 2014.
Maykut, G.: The surface heat and mass balance, in: The geophysics of sea ice, edited by: Untersteiner, N., Plenum Press, NY, 489–549, https://doi.org/10.1007/978-1-4899-5352-0, 1986.
McClymont, E. L., Bentley, M. J., Hodgson, D. A., Spencer-Jones, C. L., Wardley, T., West, M. D., Croudace, I. W., Berg, S., Gröcke, D. R., Kuhn, G., Jamieson, S. S. R., Sime, L., and Phillips, R. A.: Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits, Clim. Past, 18, 381–403, https://doi.org/10.5194/cp-18-381-2022, 2022.
McKay, R. M., Barrett, P. J., Levy, R. S., Naish, T. R., Golledge, N. R., and Pyne, A.: Antarctic Cenozoic climate history from sedimentary records: ANDRILL and beyond, Phil. Trans. R. Soc. A., 374, 20140301, https://doi.org/10.1098/rsta.2014.0301, 2016.
McMinn, A., Pankowskii, A., Ashworth, C., Bhagooli, R., Ralph, P., and Ryan, K.: In situ net primary productivity and photosynthesis of Antarctic sea ice algal, phytoplankton and benthic algal communities, Mar. Biol., 157, 1345–1356, https://doi.org/10.1007/s00227-010-1414-8, 2010.
Meissner, K. J., Schmittner, A., Weaver, A. J., and Adkins, J. F.: Ventilation of the North Atlantic Ocean during the Last Glacial Maximum: A comparison between simulated and observed radiocarbon ages, Paleoceanography, 18, 2002PA000762, https://doi.org/10.1029/2002PA000762, 2003.
Menviel, L., Yu, J., Joos, F., Mouchet, A., Meissner, K. J., and England, M. H.: Poorly ventilated deep ocean at the Last Glacial Maximum inferred from carbon isotopes: A data-model comparison study, Paleoceanography, 32, 2–17, https://doi.org/10.1002/2016PA003024, 2017.
Miles, B. W. J. and Bingham, R. G.: Progressive unanchoring of Antarctic ice shelves since 1973, Nature, 626, 785–791, https://doi.org/10.1038/s41586-024-07049-0, 2024.
Moore, J. K. and Abbott, M. R.: Phytoplankton chlorophyll distributions and primary production in the Southern Ocean, J. Geophys. Res., 105, 28709–28722, 2000.
Morales Maqueda, M. A. and Rahmstorf, S.: Did Antarctic sea-ice expansion cause glacial CO2 decline?, Geophys. Res. Lett., 29, https://doi.org/10.1029/2001GL013240, 2002.
Moreau, S., Hattermann, T., de Steur, L., Kauko, H. M., Ahonen, H., Ardelan, M., Assmy, P., Chierici, M., Descamps, S., Dinter, T., Falkenhaug, T., Fransson, A., Grønningsæter, E., Hallfredsson, E. H., Huhn, O., Lebrun, A., Lowther, A., Lübcker, N., Monteiro, P., Peeken, I., Roychoudhury, A., Różańska, M., Ryan-Keogh, T., Sanchez, N., Singh, A., Simonsen, J. H., Steiger, N., Thomalla, S. J., van Tonder, A., Wiktor, J. M., and Steen, H.: Wind-driven upwelling of iron sustains dense blooms and food webs in the eastern Weddell Gyre, Nat. Commun., 14, 1303, https://doi.org/10.1038/s41467-023-36992-1, 2023.
Muratli, J. M., Chase, Z., Mix, A. C., and McManus, J.: Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water, Nat. Geosci., 3, https://doi.org/10.1038/ngeo715, 2010.
Nadeau, L. P., Ferrari, R., and Jansen, M. F.: Antarctic sea ice control on the depth of North Atlantic deep water, J. Climate, 32, 2537–2551, https://doi.org/10.1175/JCLI-D-18-0519.1, 2019.
Nakayama, Y., Cai, C., and Seroussi, H.: Impact of Subglacial Freshwater Discharge on Pine Island Ice Shelf, Geophys. Res. Lett., 48, e2021GL093923, https://doi.org/10.1029/2021GL093923, 2021.
Naughten, K. A., Meissner, K. J., Galton-Fenzi, B. K., England, M. H., Timmermann, R., and Hellmer, H. H.: Future Projections of Antarctic Ice Shelf Melting Based on CMIP5 Scenarios, J. Climate, 31, 5243–5261, https://doi.org/10.1175/JCLI-D-17-0854.1, 2018.
Naveira Garabato, A. C., McDonagh, E. L., Stevens, D. P., Heywood, K. J., and Sanders, R. J.: On the export of Antarctic Bottom Water from the Weddell Sea, Deep-Sea Res. Pt. II, 49, 4715–4742, https://doi.org/10.1016/S0967-0645(02)00156-X, 2002.
Nihashi, S. and Ohshima, K. I.: Circumpolar Mapping of Antarctic Coastal Polynyas and Landfast Sea Ice: Relationship and Variability, J. Climate, 28, 3650–3670, https://doi.org/10.1175/JCLI-D-14-00369.1, 2015.
Ochwat, N. E., Scambos, T. A., Banwell, A. F., Anderson, R. S., Maclennan, M. L., Picard, G., Shates, J. A., Marinsek, S., Margonari, L., Truffer, M., and Pettit, E. C.: Triggers of the 2022 Larsen B multi-year landfast sea ice breakout and initial glacier response, The Cryosphere, 18, 1709–1731, https://doi.org/10.5194/tc-18-1709-2024, 2024.
Ohshima, K. I., Nihashi, S., and Iwamoto, K.: Global view of sea-ice production in polynyas and its linkage to dense/bottom water formation, Geoscience Letters, 3, 13, https://doi.org/10.1186/s40562-016-0045-4, 2016.
Oppo, D. W., Gebbie, G., Huang, K. F., Curry, W. B., Marchitto, T. M., and Pietro, K. R.: Data Constraints on Glacial Atlantic Water Mass Geometry and Properties, Paleoceanography and Paleoclimatology, 33, 1013–1034, https://doi.org/10.1029/2018PA003408, 2018.
Orsi, A. H., Whitworth, T., and Worth, N.: On the meridional extent and fronts of the Antarctic Circumpolar Current, Deep-Sea Res. Pt. I, 42, 641–673, 1995.
Pahnke, K. and Zahn, R.: Southern Hemisphere Water Mass Conversion Linked with North Atlantic Climate Variability, Science, 307, 1741–1746, 2005.
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.
Paul, A., Mulitza, S., Stein, R., and Werner, M.: A global climatology of the ocean surface during the Last Glacial Maximum mapped on a regular grid (GLOMAP), Clim. Past, 17, 805–824, https://doi.org/10.5194/cp-17-805-2021, 2021.
Pavia, F. J., Wang, S., Middleton, J., Murray, R. W., and Anderson, R. F.: Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans, Paleoceanography and Paleoclimatology, 1–15, https://doi.org/10.1029/2021pa004226, 2021.
Pellichero, V., Sallée, J.-B., Chapman, C. C., and Downes, S. M.: The southern ocean meridional overturning in the sea-ice sector is driven by freshwater fluxes, Nat. Commun., 9, 1789, https://doi.org/10.1038/s41467-018-04101-2, 2018.
Person, R., Vancoppenolle, M., Aumont, O., and Malsang, M.: Continental and Sea Ice Iron Sources Fertilize the Southern Ocean in Synergy, Geophys. Res. Lett., 48, e2021GL094761, https://doi.org/10.1029/2021GL094761, 2021.
Pesjak, L., McMinn, A., Chase, Z., and Bostock, H.: Sea ice and productivity changes over the last glacial cycle in the Adélie Land region, East Antarctica, based on diatom assemblage variability, Clim. Past, 19, 419–437, https://doi.org/10.5194/cp-19-419-2023, 2023.
Pike, J., Swann, G. E. A., Leng, M. J., and Snelling, A. M.: Glacial discharge along the west Antarctic Peninsula during the Holocene, Nat. Geosci., 6, 199–202, https://doi.org/10.1038/ngeo1703, 2013.
Pöppelmeier, F., Jeltsch-Thömmes, A., Lippold, J., Joos, F., and Stocker, T. F.: Multi-proxy constraints on Atlantic circulation dynamics since the last ice age, Nat. Geosci., 16, 349–356, https://doi.org/10.1038/s41561-023-01140-3, 2023.
Presti, M., Barbara, L., Denis, D., Schmidt, S., De Santis, L., and Crosta, X.: Sediment delivery and depositional patterns off Adélie Land (East Antarctica) in relation to late Quaternary climatic cycles, Mar. Geol., 284, 96–113, https://doi.org/10.1016/j.margeo.2011.03.012, 2011.
Pritchard, H. D., Ligtenberg, S. R. M., Fricker, H. A., Vaughan, D. G., van den Broeke, M. R., and Padman, L.: Antarctic ice-sheet loss driven by basal melting of ice shelves, Nature, 484, 502–505, https://doi.org/10.1038/nature10968, 2012.
Purich, A. and Doddridge, E. W.: Record low Antarctic sea ice coverage indicates a new sea ice state, Communications Earth & Environment, 4, https://doi.org/10.1038/s43247-023-00961-9, 2023.
Purich, A., England, M. H., Cai, W., Sullivan, A., and Durack, P. J.: Impacts of Broad-Scale Surface Freshening of the Southern Ocean in a Coupled Climate Model, J. Climate, 31, 2613–2632, https://doi.org/10.1175/JCLI-D-17-0092.1, 2018.
Purich, A., Arblaster, J. M., Boschat, G., Gillett, Z. E., Hobbs, W., Jucker, M., Lim, E.-P., Udy, D., Abram, N., Campitelli, E., Doddridge, E., England, M. H., King, A., Menviel, L., Meyer, A., Ortiz Guzmán, V., Roy, R., Rudeva, I., Spence, P., Strutton, P. G., and Ziehn, T.: Southern Annular Mode dynamics, projections and impacts in a changing climate, Nature Reviews Earth & Environment, 7, 24–42, https://doi.org/10.1038/s43017-025-00746-y, 2026.
Rae, J. W. B., Burke, A., Robinson, L. F., Adkins, J. F., Chen, T., Cole, C., Greenop, R., Li, T., Littley, E. F. M., Nita, D. C., Stewart, J. A., and Taylor, B. J.: CO2 storage and release in the deep Southern Ocean on millennial to centennial timescales, Nature, 562, 569–573, https://doi.org/10.1038/s41586-018-0614-0, 2018.
Rafter, P. A., Gray, W. R., Hines, S. K. V., Burke, A., Costa, K. M., Gottschalk, J., Hain, M. P., Rae, J. W. B., Southon, J. R., Walczak, M. H., Yu, J., Adkins, J. F., and DeVries, T.: Global reorganization of deep-sea circulation and carbon storage after the last ice age, Sci. Adv., 8, eabq5434, https://doi.org/10.1126/sciadv.abq5434, 2022.
Ragueneau, O., Treguer, P., Leynaert, A., Anderson, R. F., Brzezinski, M. A., DeMaster, D. J., Dugdale, R. C., Dymond, J., Fischer, G., and Francois, R.: A review of the Si cycle in the modern ocean: recent progress and missing gaps in the application of biogenic opal as a paleoproductivity proxy, Global Planet. Change, 26, 317–365, 2000.
Raphael, M. N., Hobbs, W., and Wainer, I.: The effect of Antarctic sea ice on the Southern Hemisphere atmosphere during the southern summer, Clim. Dynam., 36, 1403–1417, https://doi.org/10.1007/s00382-010-0892-1, 2011.
Reagan, J. R., Boyer, T. P., García, H. E., Locarnini, R. A., Baranova, O. K., Bouchard, C., Cross, S. L., Mishonov, A. V., Paver, C. R., Seidov, D., Wang, Z., and Dukhovskoy, D.: World Ocean Atlas 2023 (NCEI Accession 0270533), NOAA National Centers for Environmental Information [data set], https://doi.org/10.25921/va26-hv25, 2023.
Rintoul, S., Hughes, C., and Olbers, D.: The Antarctic Circumpolar Current System, edited by: Siedler, G., Church, J. A., and Gould, J., Academic Press, 271 pp., https://doi.org/10.1002/ajp.20122, 2001.
Robinson, R. S., Brzezinski, M. A., Beucher, C. P., Horn, M. G. S., and Bedsole, P.: The changing roles of iron and vertical mixing in regulating nitrogen and silicon cycling in the Southern Ocean over the last glacial cycle, Paleoceanography, 29, 1179–1195, https://doi.org/10.1002/2014PA002686, 2014.
Robinson, W. and Haskell, T. G.: Calving of Erebus Glacier tongue, Nature, 346, 615–616, https://doi.org/10.1038/346615b0, 1990.
Ronge, T. A., Steph, S., Tiedemann, R., Prange, M., Merkel, U., Nürnberg, D., and Kuhn, G.: Pushing the boundaries: Glacial/interglacial variability of intermediate and deep waters in the southwest Pacific over the last 350,000 years, Paleoceanography, 30, 23–38, https://doi.org/10.1002/2014PA002727, 2015.
Roukaerts, A., Cavagna, A.-J., Fripiat, F., Lannuzel, D., Meiners, K. M., and Dehairs, F.: Sea-ice algal primary production and nitrogen uptake rates off East Antarctica, Deep-Sea Res. Pt. II, 131, 140–149, https://doi.org/10.1016/j.dsr2.2015.08.007, 2016.
Rutgers van der Loeff, M. M., Cassar, N., Nicolaus, M., Rabe, B., and Stimac, I.: The influence of sea ice cover on air-sea gas exchange estimated with radon-222 profiles, J. Geophys. Res.-Oceans, 119, 2735–2751, https://doi.org/10.1002/2013JC009321, 2014.
Saenko, O. A. and Weaver, A. J.: Importance of wind-driven sea ice motion for the formation of Antarctic Intermediate Water in a global climate model, Geophys. Res. Lett., 28, 4147–4150, https://doi.org/10.1029/2001GL013632, 2001.
Saenko, O. A., Schmittner, A., and Weaver, A. J.: On the Role of Wind-Driven Sea Ice Motion on Ocean Ventilation, J. Phys. Oceanogr., 32, 3376–3395, https://doi.org/10.1175/1520-0485(2002)032<3376:OTROWD>2.0.CO;2, 2002.
Sarmiento, J. L., Gruber, N., Brzezinski, M. A., and Dunne, J. P.: High-latitude controls of thermocline nutrients and low latitude biological productivity, Nature, 426, 56–60, 2004.
Scambos, T. A., Bell, R. E., Alley, R. B., Anandakrishnan, S., Bromwich, D. H., Brunt, K., Christianson, K., Creyts, T., Das, S. B., DeConto, R., Dutrieux, P., Fricker, H. A., Holland, D., MacGregor, J., Medley, B., Nicolas, J. P., Pollard, D., Siegfried, M. R., Smith, A. M., Steig, E. J., Trusel, L. D., Vaughan, D. G., and Yager, P. L.: How much, how fast?: A science review and outlook for research on the instability of Antarctica's Thwaites Glacier in the 21st century, Global Planet. Change, 153, 16–34, https://doi.org/10.1016/j.gloplacha.2017.04.008, 2017.
Scambos, T. A., Bohlander, J. A., Shuman, C. A., and Skvarca, P.: Glacier acceleration and thinning after ice shelf collapse in the Larsen B embayment, Antarctica, Geophys. Res. Lett., 31, 2004GL020670, https://doi.org/10.1029/2004GL020670, 2004.
Schneider Mor, A., Yam, R., Bianchi, C., Kunz-Pirrung, M., Gersonde, R., and Shemesh, A.: Variable sequence of events during the past seven terminations in two deep-sea cores from the Southern Ocean, Quaternary Res.h, https://doi.org/10.1016/j.yqres.2011.11.006, 2012.
Sedwick, P. N. and DiTullio, G. R.: Regulation of algal blooms in Antarctic shelf waters by the release of iron from melting sea ice, Geophys. Res. Lett., 24, 2515–2518, 1997.
Shadwick, E. H., De Meo, O. A., Schroeter, S., Arroyo, M. C., Martinson, D. G., and Ducklow, H.: Sea Ice Suppression of CO2 Outgassing in the West Antarctic Peninsula: Implications For The Evolving Southern Ocean Carbon Sink, Geophys. Res. Lett., 48, e2020GL091835, https://doi.org/10.1029/2020GL091835, 2021.
Shemesh, a., Hodell, D., Crosta, X., Kanfoush, S., Charles, C., and Guilderson, T.: Sequence of events during the last deglaciation in Southern Ocean sediments and Antarctic ice cores, Paleoceanography, 17, 8–7, https://doi.org/10.1029/2000PA000599, 2002.
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.
Shin, S., Liu, Z., Otto‐Bliesner, B. L., Kutzbach, J. E., and Vavrus, S. J.: Southern Ocean sea‐ice control of the glacial North Atlantic thermohaline circulation, Geophys. Res. Lett., 30, 2002GL015513, https://doi.org/10.1029/2002GL015513, 2003.
Shub, A. B., Lund, D. C., Oppo, D. W., and Garity, M. L.: Brazil Margin Stable Isotope Profiles for the Last Glacial Cycle: Implications for Watermass Geometry and Oceanic Carbon Storage, Paleoceanography and Paleoclimatology, 39, https://doi.org/10.1029/2023PA004635, 2024.
Shulmeister, J., Goodwin, I., Renwick, J., Harle, K., Armand, L., McGlone, M. S., Cook, E., Dodson, J., Hesse, P. P., Mayewski, P., and Curran, M.: The Southern Hemisphere westerlies in the Australasian sector over the last glacial cycle: a synthesis, Quaternary International, 118–119, 23–53, https://doi.org/10.1016/s1040-6182(03)00129-0, 2004.
Sigman, D. and Boyle, E. A.: Glacial/interglacial variations in atmospheric carbon dioxide, Nature, 407, 859–868, 2000.
Sigman, D. M. and Boyle, E. A.: Antarctic stratification and glacial CO2, Nature, 412, 606–606, https://doi.org/10.1038/35088132, 2001.
Sigman, D. M., Fripiat, F., Studer, A. S., Kemeny, P. C., Martínez-García, A., Hain, M. P., Ai, X., Wang, X., Ren, H., and Haug, G. H.: The Southern Ocean during the ice ages: A review of the Antarctic surface isolation hypothesis, with comparison to the North Pacific, Quaternary Sci. Rev., 254, 106732–106732, https://doi.org/10.1016/j.quascirev.2020.106732, 2020.
Sigman, O. M., Altabet, M. A., McCorkle, D. C., Francois, R., and Fischer, G.: The δ15N of nitrate in the Southern Ocean: Consumption of nitrate in surface waters, Global Biogeochem. Cy., 13, 1149–1166, https://doi.org/10.1029/1999GB900038, 1999.
Sikes, E. L., Allen, K. A., and Lund, D. C.: Enhanced δ13C and δ18O Differences Between the South Atlantic and South Pacific During the Last Glaciation: The Deep Gateway Hypothesis, Paleoceanography, 32, 1000–1017, https://doi.org/10.1002/2017PA003118, 2017.
Sime, L. C., Hodgson, D., Bracegirdle, T. J., Allen, C., Perren, B., Roberts, S., and de Boer, A. M.: Sea ice led to poleward-shifted winds at the Last Glacial Maximum: the influence of state dependency on CMIP5 and PMIP3 models, Clim. Past, 12, 2241–2253, https://doi.org/10.5194/cp-12-2241-2016, 2016.
Sime, L. C., Sivankutty, R., Malmierca-Vallet, I., Goursaud Oger, S., LeGrande, A. N., McClymont, E. L., de Boer, A., Cauquoin, A., and Werner, M.: H11 meltwater and standard 127 ka Last Interglacial simulations suggest more modest peak temperatures for both Greenland and Antarctica: a multi-model study of water isotopes, Clim. Past, 21, 1725–1753, https://doi.org/10.5194/cp-21-1725-2025, 2025.
Skinner, L. C., Primeau, F., Freeman, E., De La Fuente, M., Goodwin, P. A., Gottschalk, J., Huang, E., McCave, I. N., Noble, T. L., and Scrivner, A. E.: Radiocarbon constraints on the glacial ocean circulation and its impact on atmospheric CO2, Nat. Commun., 8, 16010, https://doi.org/10.1038/ncomms16010, 2017.
Skinner, L. C.: Glacial-interglacial atmospheric CO2 change: a possible “standing volume” effect on deep-ocean carbon sequestration, Clim. Past, 5, 537–550, https://doi.org/10.5194/cp-5-537-2009, 2009.
Skinner, L., Primeau, F., Jeltsch-Thömmes, A., Joos, F., Köhler, P., and Bard, E.: Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation, Clim. Past, 19, 2177–2202, https://doi.org/10.5194/cp-19-2177-2023, 2023.
Smith, J. A., Graham, A. G. C., Post, A. L., Hillenbrand, C. D., Bart, P. J., and Powell, R. D.: The marine geological imprint of Antarctic ice shelves, Nat. Commun., 10, 1–16, https://doi.org/10.1038/s41467-019-13496-5, 2019.
Smith, J. A., Hillenbrand, C. D., Pudsey, C. J., Allen, C. S., and Graham, A. G. C.: The presence of polynyas in the Weddell Sea during the Last Glacial Period with implications for the reconstruction of sea-ice limits and ice sheet history, Earth Planet. Sc. Lett., 296, 287–298, https://doi.org/10.1016/j.epsl.2010.05.008, 2010.
Stein, K., Timmermann, A., Kwon, E. Y., and Friedrich, T.: Timing and magnitude of Southern Ocean sea ice/carbon cycle feedbacks, P. Natl. Acad. Sci. USA, 117, 29240–29240, https://doi.org/10.1073/pnas.2020171117, 2020.
Stephens, B. B. and Keeling, R. F.: The influence of Antarctic sea ice on glacial-interglacial CO2 variations, Nature, 404, 171–174, 2000.
Stern, A. A., Dinniman, M. S., Zagorodnov, V., Tyler, S. W., and Holland, D. M.: Intrusion of warm surface water beneath the McMurdo Ice Shelf, Antarctica, J. Geophys. Res.-Oceans, 118, 7036–7048, https://doi.org/10.1002/2013JC008842, 2013.
Stewart, C. L., Christoffersen, P., Nicholls, K. W., Williams, M. J. M., and Dowdeswell, J. A.: Basal melting of Ross Ice Shelf from solar heat absorption in an ice-front polynya, Nat. Geosci., 12, 435–440, https://doi.org/10.1038/s41561-019-0356-0, 2019.
Studer, A. S., Sigman, D. M., Martínez-García, A., Benz, V., Winckler, G., Kuhn, G., Esper, O., Lamy, F., Jaccard, S. L., Wacker, L., Oleynik, S., Gersonde, R., and Haug, G. H.: Antarctic Zone nutrient conditions during the last two glacial cycles, Paleoceanography, 30, 845–862, https://doi.org/10.1002/2014PA002745, 2015.
Sun, X. and Matsumoto, K.: Effects of sea ice on atmospheric pCO2: A revised view and implications for glacial and future climates, J. Geophys. Res., 115, G02015, https://doi.org/10.1029/2009JG001023, 2010.
Sun, Y., Riel, B., and Minchew, B.: Disintegration and Buttressing Effect of the Landfast Sea Ice in the Larsen B Embayment, Antarctic Peninsula, Geophys. Res. Lett., 50, e2023GL104066, https://doi.org/10.1029/2023GL104066, 2023.
Surawy-Stepney, T., Hogg, A. E., Cornford, S. L., Wallis, B. J., Davison, B. J., Selley, H. L., Slater, R. A. W., Lie, E. K., Jakob, L., Ridout, A., Gourmelen, N., Freer, B. I. D., Wilson, S. F., and Shepherd, A.: The effect of landfast sea ice buttressing on ice dynamic speedup in the Larsen B embayment, Antarctica, The Cryosphere, 18, 977–993, https://doi.org/10.5194/tc-18-977-2024, 2024.
Swadling, K. M., Constable, A. J., Fraser, A. D., Massom, R. A., Borup, M. D., Ghigliotti, L., Granata, A., Guglielmo, L., Johnston, N. M., Kawaguchi, S., Kennedy, F., Kiko, R., Koubbi, P., Makabe, R., Martin, A., McMinn, A., Moteki, M., Pakhomov, E. A., Peeken, I., Reimer, J., Reid, P., Ryan, K. G., Vacchi, M., Virtue, P., Weldrick, C. K., Wongpan, P., and Wotherspoon, S. J.: Biological responses to change in Antarctic sea ice habitats, Front. Ecol. Evol., 10, https://doi.org/10.3389/fevo.2022.1073823, 2023.
Tagliabue, A., Bopp, L., Roche, D. M., Bouttes, N., Dutay, J.-C., Alkama, R., Kageyama, M., Michel, E., and Paillard, D.: Quantifying the roles of ocean circulation and biogeochemistry in governing ocean carbon-13 and atmospheric carbon dioxide at the last glacial maximum, Clim. Past, 5, 695–706, https://doi.org/10.5194/cp-5-695-2009, 2009.
Talley, L. D.: Closure of the global overturning circulation through the Indian, Pacific and Southern Oceans: schematics and transports, Oceanography, 53, 1689–1699, https://doi.org/10.1017/CBO9781107415324.004, 2013.
Tamsitt, V., Drake, H. F., Morrison, A. K., Talley, L. D., Dufour, C. O., Gray, A. R., Griffies, S. M., Mazloff, M. R., Sarmiento, J. L., Wang, J., and Weijer, W.: Spiraling pathways of global deep waters to the surface of the Southern Ocean, Nat. Commun., 8, 172, https://doi.org/10.1038/s41467-017-00197-0, 2017.
Teder, N. J., Bennetts, L. G., Reid, P. A., and Massom, R. A.: Sea ice-free corridors for large swell to reach Antarctic ice shelves, Environ. Res. Lett., 17, 045026, https://doi.org/10.1088/1748-9326/ac5edd, 2022.
Teder, N. J., Bennetts, L. G., Reid, P. A., Massom, R. A., Pitt, J. P. A., Scambos, T. A., and Fraser, A. D.: Large-scale ice-shelf calving events follow prolonged amplifications in flexure, Nat. Geosci., 18, 599–606, https://doi.org/10.1038/s41561-025-01713-4, 2025.
Tewari, K., Mishra, S. K., Salunke, P., Ozawa, H., and Dewan, A.: Potential effects of the projected Antarctic sea-ice loss on the climate system, Clim. Dynam., 60, 589–601, https://doi.org/10.1007/s00382-022-06320-2, 2023.
Thöle, L. M., Amsler, H. E., Moretti, S., Auderset, A., Gilgannon, J., Lippold, J., Vogel, H., Crosta, X., Mazaud, A., Michel, E., Martínez-García, A., and Jaccard, S. L.: Glacial-interglacial dust and export production records from the Southern Indian Ocean, Earth Planet. Sc. Lett., 525, 115716, https://doi.org/10.1016/j.epsl.2019.115716, 2019.
Timmermann, R. and Hellmer, H. H.: Southern Ocean warming and increased ice shelf basal melting in the twenty-first and twenty-second centuries based on coupled ice-ocean finite-element modelling, Ocean Dynam., 63, 1011–1026, https://doi.org/10.1007/s10236-013-0642-0, 2013.
Toggweiler, J. R., Russell, J. L., and Carson, S. R.: Midlatitude westerlies, atmospheric CO2, and climate change during the ice ages, Paleoceanography, 21, PA2005, https://doi.org/10.1029/2005PA001154, 2006.
Totten, R. L., Anderson, J. B., Fernandez, R., and Wellner, J. S.: Marine record of Holocene climate, ocean, and cryosphere interactions: Herbert Sound, James Ross Island, Antarctica, Quaternary Sci. Rev., 129, 239–259, https://doi.org/10.1016/j.quascirev.2015.09.009, 2015.
Totten, R. L., Fonseca, A. N. R., Wellner, J. S., Munoz, Y. P., Anderson, J. B., Tobin, T. S., and Lehrmann, A. A.: Oceanographic and climatic influences on Trooz Glacier, Antarctica during the Holocene, Quaternary Sci. Rev., 276, 107279, https://doi.org/10.1016/j.quascirev.2021.107279, 2022.
Tréguer, P. and Jacques, G.: Dynamics of nutrients and phytoplankton, and fluxes of carbon, nitrogen and silicon in the Antarctic Ocean, Polar Biol., 12, https://doi.org/10.1007/BF00238255, 1992.
Trevena, A. J. and Jones, G. B.: Dimethylsulphide and dimethylsulphoniopropionate in Antarctic sea ice and their release during sea ice melting, Mar. Chem., 98, 210–222, https://doi.org/10.1016/j.marchem.2005.09.005, 2006.
Van Achter, G., Fichefet, T., Goosse, H., Pelletier, C., Sterlin, J., Huot, P.-V., Lemieux, J.-F., Fraser, A. D., Haubner, K., and Porter-Smith, R.: Modelling landfast sea ice and its influence on ocean–ice interactions in the area of the Totten Glacier, East Antarctica, Ocean Model., 169, 101920, https://doi.org/10.1016/j.ocemod.2021.101920, 2022.
Van Leeuwe, M. A., Tedesco, L., Arrigo, K. R., Assmy, P., Campbell, K., Meiners, K. M., Rintala, J.-M., Selz, V., Thomas, D. N., and Stefels, J.: Microalgal community structure and primary production in Arctic and Antarctic sea ice: A synthesis, Elementa: Science of the Anthropocene, 6, 4, https://doi.org/10.1525/elementa.267, 2018.
Venugopal, A. U., Bertler, N. A. N., Severinghaus, J. P., Brook, E. J., Cortese, G., Lee, J. E., Blunier, T., Mayewski, P. A., Kjær, H. A., Carter, L., Weber, M. E., Levy, R. H., Pyne, R. L., and Vandergoes, M. J.: Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP, Nat. Commun., 14, 5432, https://doi.org/10.1038/s41467-023-40951-1, 2023.
Vernet, M., Martinson, D., Iannuzzi, R., Stammerjohn, S., Kozlowski, W., Sines, K., Smith, R., and Garibotti, I.: Primary production within the sea-ice zone west of the Antarctic Peninsula: I – Sea ice, summer mixed layer, and irradiance, Deep-Sea Res. Pt. II, 55, 2068–2085, https://doi.org/10.1016/j.dsr2.2008.05.021, 2008.
WAIS Divide Project Members: Onset of deglacial warming in West Antarctica driven by local orbital forcing, Nature, 500, 440–444, https://doi.org/10.1038/nature12376, 2013.
Wang, Y., Costa, K. M., Lu, W., Hines, S. K. V., and Nielsen, S. G.: Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation, Science Advances, 10, eadk2506, https://doi.org/10.1126/sciadv.adk2506, 2024.
Webb, A. L., van Leeuwe, M. A., den Os, D.., Meredith, M. P., J. Venables, H., and Stefels, J.: Extreme spikes in DMS flux double estimates of biogenic sulfur export from the Antarctic coastal zone to the atmosphere, Sci. Rep., 9, 2233, https://doi.org/10.1038/s41598-019-38714-4, 2019.
Weber, M. E., Clark, P. U., Kuhn, G., Timmermann, A., Sprenk, D., Gladstone, R., Zhang, X., Lohmann, G., Menviel, L., Chikamoto, M. O., Friedrich, T., and Ohlwein, C.: Millennial-scale variability in Antarctic ice-sheet discharge during the last deglaciation, Nature, 510, 134–138, 2014.
Weis, J., Chase, Z., Schallenberg, C., Strutton, P. G., Bowie, A. R., and Fiddes, S. L.: One-third of Southern Ocean productivity is supported by dust deposition, Nature, 629, 603–608, https://doi.org/10.1038/s41586-024-07366-4, 2024.
Wellner, J., Scambos, T., Domack, E., Vernet, M., Leventer, A., Balco, G., Brachfeld, S., Cape, M., Huber, B., Ishman, S., McCormick, M., Mosley-Thompson, E., Pettit, E., Smith, C., Truffer, M., Van Dover, C., and Yoo, K.-C.: The Larsen Ice Shelf System, Antarctica (LARISSA): Polar Systems Bound Together, Changing Fast, GSA Today, 29, 4–10, https://doi.org/10.1130/GSATG382A.1, 2019.
Whitworth III, T. and Nowlin Jr., W. D.: Water masses and currents of the Southern Ocean at the Greenwich Meridian, J. Geophys. Res., 92, 6462–6476, https://doi.org/10.1029/JC092iC06p06462, 1987.
Wolff, E. W., Barbante, C., Becagli, S., Bigler, M., Boutron, C. F., Castellano, E., de Angelis, M., Federer, U., Fischer, H., Fundel, F., Hansson, M., Hutterli, M., Jonsell, U., Karlin, T., Kaufmann, P., Lambert, F., Littot, G. C., Mulvaney, R., Röthlisberger, R., Ruth, U., Severi, M., Siggaard-Andersen, M. L., Sime, L. C., Steffensen, J. P., Stocker, T. F., Traversi, R., Twarloh, B., Udisti, R., Wagenbach, D., and Wegner, A.: Changes in environment over the last 800,000 years from chemical analysis of the EPICA Dome C ice core, Quaternary Sci. Rev., 29, 285–295, https://doi.org/10.1016/j.quascirev.2009.06.013, 2010.
Wolff, E. W., Fischer, H., Fundel, F., Ruth, U., Twarloh, B., Littot, G. C., Mulvaney, R., Röthlisberger, R., De Angelis, M., Boutron, C. F., Hansson, M., Jonsell, U., Hutterli, M. A., Lambert, F., Kaufmann, P., Stauffer, B., Stocker, T. F., Steffensen, J. P., Bigler, M., Siggaard-Andersen, M. L., Udisti, R., Becagli, S., Castellano, E., Severi, M., Wagenbach, D., Barbante, C., Gabrielli, P., and Gaspari, V.: Southern Ocean sea-ice extent, productivity and iron flux over the past eight glacial cycles, Nature, 440, 491–496, https://doi.org/10.1038/nature04614, 2006.
Wu, L., Wang, R., Xiao, W., Krijgsman, W., Li, Q., Ge, S., and Ma, T.: Late Quaternary Deep Stratification-Climate Coupling in the Southern Ocean: Implications for Changes in Abyssal Carbon Storage, Geochem. Geophy. Geosy., 19, 379–395, https://doi.org/10.1002/2017GC007250, 2018.
Xu, X., Martin, T., Beadling, R. L., Liu, J., Bischof, S., Hattermann, T., Huo, W., Li, Q., Marshall, J. C., Muilwijk, M., Pauling, A. G., Purich, A., Smith, I. J., Swart, N. C., and Thomas, M.: Robustness and mechanisms of the atmospheric response over the Southern Ocean to idealized freshwater input around Antarctica, Geophys. Res. Lett., 52, e2024GL113734, https://doi.org/10.1029/2024GL113734, 2025.
Yin, J. H.: A consistent poleward shift of the storm tracks in simulations of 21st century climate, Geophys. Res. Lett., 32, L18701, https://doi.org/10.1029/2005GL023684, 2005.
Zemmelink, H. J., Houghton, L., Dacey, J. W. H., Worby, A. P., and Liss, P. S.: Emission of dimethylsulfide from Weddell Sea leads, Geophys. Res. Lett., 32, L23610, https://doi.org/10.1029/2005GL024242, 2005.
Zhou, L., Heuzé, C., and Mohrmann, M.: Sea Ice Production in the 2016 and 2017 Maud Rise Polynyas, J. Geophys. Res.-Oceans, 128, e2022JC019148, https://doi.org/10.1029/2022JC019148, 2023.
Short summary
The impacts of recent dramatic declines in Antarctic sea ice on the Earth system are uncertain. We reviewed how sea ice affects ocean circulation, ice sheets, winds, and the carbon cycle by considering theory and modern observations alongside paleo-proxy reconstructions. We found evidence of connections between sea ice and these systems, but also conflicting results, pointing to missing knowledge. Our work highlights the complex role of sea ice in the Earth system.
The impacts of recent dramatic declines in Antarctic sea ice on the Earth system are uncertain....
