Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice
International audience Abstract Understanding how climate change influences ocean-driven melting of the Antarctic ice shelves is one of the greatest challenges for projecting future sea level rise. The East Antarctic ice shelf cavities host cold water masses that limit melting, and only a few short-...
Published in: | Nature Geoscience |
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Main Authors: | , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2023
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Online Access: | https://hal.science/hal-04287753 https://hal.science/hal-04287753/document https://hal.science/hal-04287753/file/s41561-023-01273-5.pdf https://doi.org/10.1038/s41561-023-01273-5 |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
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[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Lauber, Julius Hattermann, Tore de Steur, Laura Darelius, Elin Auger, Matthis Nøst, Ole Anders Moholdt, Geir Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Abstract Understanding how climate change influences ocean-driven melting of the Antarctic ice shelves is one of the greatest challenges for projecting future sea level rise. The East Antarctic ice shelf cavities host cold water masses that limit melting, and only a few short-term observational studies exist on what drives warm water intrusions into these cavities. We analyse nine years of continuous oceanographic records from below Fimbulisen and relate them to oceanic and atmospheric forcing. On monthly time scales, warm inflow events are associated with weakened coastal easterlies reducing downwelling in front of the ice shelf. Since 2016, however, we observe sustained warming, with inflowing Warm Deep Water temperatures reaching above 0 °C. This is concurrent with an increase in satellite-derived basal melt rates of 0.62 m yr −1 , which nearly doubles the basal mass loss at this relatively cold ice shelf cavity. We find that this transition is linked to a reduction in coastal sea ice cover through an increase in atmosphere–ocean momentum transfer and to a strengthening of remote subpolar westerlies. These results imply that East Antarctic ice shelves may become more exposed to warmer waters with a projected increase of circum-Antarctic westerlies, increasing this region’s relevance for sea level rise projections. |
author2 |
Norwegian Polar Institute Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) University of Tasmania Hobart, Australia (UTAS) Akvaplan-Niva Tromsø Norwegian Institute for Water Research (NIVA) |
format |
Article in Journal/Newspaper |
author |
Lauber, Julius Hattermann, Tore de Steur, Laura Darelius, Elin Auger, Matthis Nøst, Ole Anders Moholdt, Geir |
author_facet |
Lauber, Julius Hattermann, Tore de Steur, Laura Darelius, Elin Auger, Matthis Nøst, Ole Anders Moholdt, Geir |
author_sort |
Lauber, Julius |
title |
Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice |
title_short |
Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice |
title_full |
Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice |
title_fullStr |
Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice |
title_full_unstemmed |
Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice |
title_sort |
warming beneath an east antarctic ice shelf due to increased subpolar westerlies and reduced sea ice |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04287753 https://hal.science/hal-04287753/document https://hal.science/hal-04287753/file/s41561-023-01273-5.pdf https://doi.org/10.1038/s41561-023-01273-5 |
genre |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice |
op_source |
ISSN: 1752-0894 Nature Geoscience https://hal.science/hal-04287753 Nature Geoscience, 2023, 16 (10), pp.877-885. ⟨10.1038/s41561-023-01273-5⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41561-023-01273-5 hal-04287753 https://hal.science/hal-04287753 https://hal.science/hal-04287753/document https://hal.science/hal-04287753/file/s41561-023-01273-5.pdf doi:10.1038/s41561-023-01273-5 WOS: 001069506500001 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41561-023-01273-5 |
container_title |
Nature Geoscience |
container_volume |
16 |
container_issue |
10 |
container_start_page |
877 |
op_container_end_page |
885 |
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1797569438912872448 |
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ftinsu:oai:HAL:hal-04287753v1 2024-04-28T07:58:25+00:00 Warming beneath an East Antarctic ice shelf due to increased subpolar westerlies and reduced sea ice Lauber, Julius Hattermann, Tore de Steur, Laura Darelius, Elin Auger, Matthis Nøst, Ole Anders Moholdt, Geir Norwegian Polar Institute Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) University of Tasmania Hobart, Australia (UTAS) Akvaplan-Niva Tromsø Norwegian Institute for Water Research (NIVA) 2023-10 https://hal.science/hal-04287753 https://hal.science/hal-04287753/document https://hal.science/hal-04287753/file/s41561-023-01273-5.pdf https://doi.org/10.1038/s41561-023-01273-5 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41561-023-01273-5 hal-04287753 https://hal.science/hal-04287753 https://hal.science/hal-04287753/document https://hal.science/hal-04287753/file/s41561-023-01273-5.pdf doi:10.1038/s41561-023-01273-5 WOS: 001069506500001 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1752-0894 Nature Geoscience https://hal.science/hal-04287753 Nature Geoscience, 2023, 16 (10), pp.877-885. ⟨10.1038/s41561-023-01273-5⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.1038/s41561-023-01273-5 2024-04-05T00:27:42Z International audience Abstract Understanding how climate change influences ocean-driven melting of the Antarctic ice shelves is one of the greatest challenges for projecting future sea level rise. The East Antarctic ice shelf cavities host cold water masses that limit melting, and only a few short-term observational studies exist on what drives warm water intrusions into these cavities. We analyse nine years of continuous oceanographic records from below Fimbulisen and relate them to oceanic and atmospheric forcing. On monthly time scales, warm inflow events are associated with weakened coastal easterlies reducing downwelling in front of the ice shelf. Since 2016, however, we observe sustained warming, with inflowing Warm Deep Water temperatures reaching above 0 °C. This is concurrent with an increase in satellite-derived basal melt rates of 0.62 m yr −1 , which nearly doubles the basal mass loss at this relatively cold ice shelf cavity. We find that this transition is linked to a reduction in coastal sea ice cover through an increase in atmosphere–ocean momentum transfer and to a strengthening of remote subpolar westerlies. These results imply that East Antarctic ice shelves may become more exposed to warmer waters with a projected increase of circum-Antarctic westerlies, increasing this region’s relevance for sea level rise projections. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Institut national des sciences de l'Univers: HAL-INSU Nature Geoscience 16 10 877 885 |