Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition
Antarctic climate warming and atmospheric CO 2 rise during the last deglaciation may be attributed in part to sea ice reduction in the Southern Ocean. Yet, glacial–interglacial Antarctic sea ice dynamics and underlying mechanisms are poorly constrained, as robust sea ice proxy evidence is sparse. He...
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Online Access: | http://dx.doi.org/10.1126/sciadv.adh9513 https://www.science.org/doi/pdf/10.1126/sciadv.adh9513 |
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craaas:10.1126/sciadv.adh9513 2024-06-09T07:39:23+00:00 Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition Sadatzki, Henrik Opdyke, Bradley Menviel, Laurie Leventer, Amy Hope, Janet M. Brocks, Jochen J. Fallon, Stewart Post, Alexandra L. O’Brien, Philip E. Grant, Katharine Armand, Leanne 2023 http://dx.doi.org/10.1126/sciadv.adh9513 https://www.science.org/doi/pdf/10.1126/sciadv.adh9513 en eng American Association for the Advancement of Science (AAAS) Science Advances volume 9, issue 41 ISSN 2375-2548 journal-article 2023 craaas https://doi.org/10.1126/sciadv.adh9513 2024-05-16T12:55:19Z Antarctic climate warming and atmospheric CO 2 rise during the last deglaciation may be attributed in part to sea ice reduction in the Southern Ocean. Yet, glacial–interglacial Antarctic sea ice dynamics and underlying mechanisms are poorly constrained, as robust sea ice proxy evidence is sparse. Here, we present a molecular biomarker-based sea ice record that resolves the spring/summer sea ice variability off East Antarctica during the past 40 thousand years (ka). Our results indicate that substantial sea ice reduction culminated rapidly and contemporaneously with upwelling of carbon-enriched waters in the Southern Ocean at the onset of the last deglaciation but began at least ~2 ka earlier probably driven by an increasing local integrated summer insolation. Our findings suggest that sea ice reduction and associated feedbacks facilitated stratification breakup and outgassing of CO 2 in the Southern Ocean and warming in Antarctica but may also have played a leading role in initializing these deglacial processes in the Southern Hemisphere. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean AAAS Resource Center (American Association for the Advancement of Science) Antarctic Southern Ocean East Antarctica Science Advances 9 41 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
Antarctic climate warming and atmospheric CO 2 rise during the last deglaciation may be attributed in part to sea ice reduction in the Southern Ocean. Yet, glacial–interglacial Antarctic sea ice dynamics and underlying mechanisms are poorly constrained, as robust sea ice proxy evidence is sparse. Here, we present a molecular biomarker-based sea ice record that resolves the spring/summer sea ice variability off East Antarctica during the past 40 thousand years (ka). Our results indicate that substantial sea ice reduction culminated rapidly and contemporaneously with upwelling of carbon-enriched waters in the Southern Ocean at the onset of the last deglaciation but began at least ~2 ka earlier probably driven by an increasing local integrated summer insolation. Our findings suggest that sea ice reduction and associated feedbacks facilitated stratification breakup and outgassing of CO 2 in the Southern Ocean and warming in Antarctica but may also have played a leading role in initializing these deglacial processes in the Southern Hemisphere. |
format |
Article in Journal/Newspaper |
author |
Sadatzki, Henrik Opdyke, Bradley Menviel, Laurie Leventer, Amy Hope, Janet M. Brocks, Jochen J. Fallon, Stewart Post, Alexandra L. O’Brien, Philip E. Grant, Katharine Armand, Leanne |
spellingShingle |
Sadatzki, Henrik Opdyke, Bradley Menviel, Laurie Leventer, Amy Hope, Janet M. Brocks, Jochen J. Fallon, Stewart Post, Alexandra L. O’Brien, Philip E. Grant, Katharine Armand, Leanne Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition |
author_facet |
Sadatzki, Henrik Opdyke, Bradley Menviel, Laurie Leventer, Amy Hope, Janet M. Brocks, Jochen J. Fallon, Stewart Post, Alexandra L. O’Brien, Philip E. Grant, Katharine Armand, Leanne |
author_sort |
Sadatzki, Henrik |
title |
Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition |
title_short |
Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition |
title_full |
Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition |
title_fullStr |
Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition |
title_full_unstemmed |
Early sea ice decline off East Antarctica at the last glacial–interglacial climate transition |
title_sort |
early sea ice decline off east antarctica at the last glacial–interglacial climate transition |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1126/sciadv.adh9513 https://www.science.org/doi/pdf/10.1126/sciadv.adh9513 |
geographic |
Antarctic Southern Ocean East Antarctica |
geographic_facet |
Antarctic Southern Ocean East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_source |
Science Advances volume 9, issue 41 ISSN 2375-2548 |
op_doi |
https://doi.org/10.1126/sciadv.adh9513 |
container_title |
Science Advances |
container_volume |
9 |
container_issue |
41 |
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1801379120149430272 |