Competing climate feedbacks of ice sheet freshwater discharge in a warming world
Abstract Freshwater discharge from ice sheets induces surface atmospheric cooling and subsurface ocean warming, which are associated with negative and positive feedbacks respectively. However, uncertainties persist regarding these feedbacks’ relative strength and combined effect. Here we assess asso...
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ftdoajarticles:oai:doaj.org/article:9f7fc8bb3f6e45d49bd9edd25ac1f37e 2024-09-15T17:48:20+00:00 Competing climate feedbacks of ice sheet freshwater discharge in a warming world Dawei Li Robert M. DeConto David Pollard Yongyun Hu 2024-06-01T00:00:00Z https://doi.org/10.1038/s41467-024-49604-3 https://doaj.org/article/9f7fc8bb3f6e45d49bd9edd25ac1f37e EN eng Nature Portfolio https://doi.org/10.1038/s41467-024-49604-3 https://doaj.org/toc/2041-1723 doi:10.1038/s41467-024-49604-3 2041-1723 https://doaj.org/article/9f7fc8bb3f6e45d49bd9edd25ac1f37e Nature Communications, Vol 15, Iss 1, Pp 1-12 (2024) Science Q article 2024 ftdoajarticles https://doi.org/10.1038/s41467-024-49604-3 2024-08-05T17:49:08Z Abstract Freshwater discharge from ice sheets induces surface atmospheric cooling and subsurface ocean warming, which are associated with negative and positive feedbacks respectively. However, uncertainties persist regarding these feedbacks’ relative strength and combined effect. Here we assess associated feedbacks in a coupled ice sheet-climate model, and show that for the Antarctic Ice Sheet the positive feedback dominates in moderate future warming scenarios and in the early stage of ice sheet retreat, but is overwhelmed by the negative feedback in intensive warming scenarios when the West Antarctic Ice Sheet undergoes catastrophic collapse. The Atlantic Meridional Overturning Circulation is affected by freshwater discharge from both the Greenland and the Antarctic ice sheets and, as an interhemispheric teleconnection bridge, exacerbates the opposing ice sheet’s retreat via the Bipolar Seesaw. These results highlight the crucial role of ice sheet-climate interactions via freshwater flux in future ice sheet retreat and associated sea-level rise. Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet Directory of Open Access Journals: DOAJ Articles Nature Communications 15 1 |
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Science Q Dawei Li Robert M. DeConto David Pollard Yongyun Hu Competing climate feedbacks of ice sheet freshwater discharge in a warming world |
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Science Q |
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Abstract Freshwater discharge from ice sheets induces surface atmospheric cooling and subsurface ocean warming, which are associated with negative and positive feedbacks respectively. However, uncertainties persist regarding these feedbacks’ relative strength and combined effect. Here we assess associated feedbacks in a coupled ice sheet-climate model, and show that for the Antarctic Ice Sheet the positive feedback dominates in moderate future warming scenarios and in the early stage of ice sheet retreat, but is overwhelmed by the negative feedback in intensive warming scenarios when the West Antarctic Ice Sheet undergoes catastrophic collapse. The Atlantic Meridional Overturning Circulation is affected by freshwater discharge from both the Greenland and the Antarctic ice sheets and, as an interhemispheric teleconnection bridge, exacerbates the opposing ice sheet’s retreat via the Bipolar Seesaw. These results highlight the crucial role of ice sheet-climate interactions via freshwater flux in future ice sheet retreat and associated sea-level rise. |
format |
Article in Journal/Newspaper |
author |
Dawei Li Robert M. DeConto David Pollard Yongyun Hu |
author_facet |
Dawei Li Robert M. DeConto David Pollard Yongyun Hu |
author_sort |
Dawei Li |
title |
Competing climate feedbacks of ice sheet freshwater discharge in a warming world |
title_short |
Competing climate feedbacks of ice sheet freshwater discharge in a warming world |
title_full |
Competing climate feedbacks of ice sheet freshwater discharge in a warming world |
title_fullStr |
Competing climate feedbacks of ice sheet freshwater discharge in a warming world |
title_full_unstemmed |
Competing climate feedbacks of ice sheet freshwater discharge in a warming world |
title_sort |
competing climate feedbacks of ice sheet freshwater discharge in a warming world |
publisher |
Nature Portfolio |
publishDate |
2024 |
url |
https://doi.org/10.1038/s41467-024-49604-3 https://doaj.org/article/9f7fc8bb3f6e45d49bd9edd25ac1f37e |
genre |
Antarc* Antarctic Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet |
op_source |
Nature Communications, Vol 15, Iss 1, Pp 1-12 (2024) |
op_relation |
https://doi.org/10.1038/s41467-024-49604-3 https://doaj.org/toc/2041-1723 doi:10.1038/s41467-024-49604-3 2041-1723 https://doaj.org/article/9f7fc8bb3f6e45d49bd9edd25ac1f37e |
op_doi |
https://doi.org/10.1038/s41467-024-49604-3 |
container_title |
Nature Communications |
container_volume |
15 |
container_issue |
1 |
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1810289477056200704 |