Rapid Antarctic ice sheet retreat under low atmospheric CO2
International audience Over the last 5 Million years, outstanding warm interglacial periods (i.e. ‘super-interglacials’) occurred under low atmospheric CO 2 levels that may feature extensive Antarctica ice sheet collapse. Here, we focus on the extreme super-interglacial known as Marine Isotope Stage...
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Language: | English |
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HAL CCSD
2020
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Online Access: | https://hal.science/hal-03503475 https://doi.org/10.5194/egusphere-egu2020-12028 |
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ftunivnantes:oai:HAL:hal-03503475v1 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDE.MCG]Environmental Sciences/Global Changes Beltran, Catherine Golledge, Nicholas R. Ohneiser, Christian Kowalewski, Douglas E. Sicre, Marie-Alexandrine Hageman, Kimberly J. Smith, Robert O. Wilson, Gary S. Mainié, François Rapid Antarctic ice sheet retreat under low atmospheric CO2 |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Over the last 5 Million years, outstanding warm interglacial periods (i.e. ‘super-interglacials’) occurred under low atmospheric CO 2 levels that may feature extensive Antarctica ice sheet collapse. Here, we focus on the extreme super-interglacial known as Marine Isotope Stage 31 (MIS31) that took place 1.072 million years ago and is the subject of intense debate. Our Southern Ocean organic biomarker based paleotemperature reconstructions show that the surface ocean was warmer by ~5 °C than today between 50 °S and the Antarctic ice margin. We used these ocean temperature records to constrain the climate and ice sheet simulations to explore the impact of ocean warming on the Antarctic ice sheets. Our results show that low amplitude short term oceanic modifications drove the collapse of the West Antarctic Ice Sheet (WAIS) and deflation of sectors of the East Antarctic Ice Sheet (EAIS) resulting in sustained sea-level rise of centimeters to decimeters per decade. We suggest the WAIS retreated because of anomalously high Southern Hemisphere insolation combined with the intrusion of Circumpolar Deep Water onto the continental shelf under poleward-intensified winds leading to a shorter sea ice season and ocean warming at the continental margin. Under this scenario, the extreme warming we observe likely reflects the extensively modified oceanic and hydrological circulation patterns following ice sheet collapse. Our work highlights the sensitivity of the Antarctic ice sheets to relatively minor oceanic and/or atmospheric perturbations that could be at play in the near future. |
author2 |
University of Otago Dunedin, Nouvelle-Zélande Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) Worcester State University Worcester Variabilité de l'Océan et de la Glace de mer (VOG) 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) |
format |
Conference Object |
author |
Beltran, Catherine Golledge, Nicholas R. Ohneiser, Christian Kowalewski, Douglas E. Sicre, Marie-Alexandrine Hageman, Kimberly J. Smith, Robert O. Wilson, Gary S. Mainié, François |
author_facet |
Beltran, Catherine Golledge, Nicholas R. Ohneiser, Christian Kowalewski, Douglas E. Sicre, Marie-Alexandrine Hageman, Kimberly J. Smith, Robert O. Wilson, Gary S. Mainié, François |
author_sort |
Beltran, Catherine |
title |
Rapid Antarctic ice sheet retreat under low atmospheric CO2 |
title_short |
Rapid Antarctic ice sheet retreat under low atmospheric CO2 |
title_full |
Rapid Antarctic ice sheet retreat under low atmospheric CO2 |
title_fullStr |
Rapid Antarctic ice sheet retreat under low atmospheric CO2 |
title_full_unstemmed |
Rapid Antarctic ice sheet retreat under low atmospheric CO2 |
title_sort |
rapid antarctic ice sheet retreat under low atmospheric co2 |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03503475 https://doi.org/10.5194/egusphere-egu2020-12028 |
op_coverage |
Vienne, Austria |
geographic |
Antarctic East Antarctic Ice Sheet Southern Ocean The Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic East Antarctic Ice Sheet Southern Ocean The Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean |
op_source |
EGU 2020 https://hal.science/hal-03503475 EGU 2020, May 2020, Vienne, Austria. ⟨10.5194/egusphere-egu2020-12028⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu2020-12028 hal-03503475 https://hal.science/hal-03503475 doi:10.5194/egusphere-egu2020-12028 |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-12028 |
_version_ |
1766244735618383872 |
spelling |
ftunivnantes:oai:HAL:hal-03503475v1 2023-05-15T13:46:38+02:00 Rapid Antarctic ice sheet retreat under low atmospheric CO2 Beltran, Catherine Golledge, Nicholas R. Ohneiser, Christian Kowalewski, Douglas E. Sicre, Marie-Alexandrine Hageman, Kimberly J. Smith, Robert O. Wilson, Gary S. Mainié, François University of Otago Dunedin, Nouvelle-Zélande Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) Worcester State University Worcester Variabilité de l'Océan et de la Glace de mer (VOG) 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) Vienne, Austria 2020-05 https://hal.science/hal-03503475 https://doi.org/10.5194/egusphere-egu2020-12028 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu2020-12028 hal-03503475 https://hal.science/hal-03503475 doi:10.5194/egusphere-egu2020-12028 EGU 2020 https://hal.science/hal-03503475 EGU 2020, May 2020, Vienne, Austria. ⟨10.5194/egusphere-egu2020-12028⟩ [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/conferenceObject Conference papers 2020 ftunivnantes https://doi.org/10.5194/egusphere-egu2020-12028 2023-02-08T03:27:28Z International audience Over the last 5 Million years, outstanding warm interglacial periods (i.e. ‘super-interglacials’) occurred under low atmospheric CO 2 levels that may feature extensive Antarctica ice sheet collapse. Here, we focus on the extreme super-interglacial known as Marine Isotope Stage 31 (MIS31) that took place 1.072 million years ago and is the subject of intense debate. Our Southern Ocean organic biomarker based paleotemperature reconstructions show that the surface ocean was warmer by ~5 °C than today between 50 °S and the Antarctic ice margin. We used these ocean temperature records to constrain the climate and ice sheet simulations to explore the impact of ocean warming on the Antarctic ice sheets. Our results show that low amplitude short term oceanic modifications drove the collapse of the West Antarctic Ice Sheet (WAIS) and deflation of sectors of the East Antarctic Ice Sheet (EAIS) resulting in sustained sea-level rise of centimeters to decimeters per decade. We suggest the WAIS retreated because of anomalously high Southern Hemisphere insolation combined with the intrusion of Circumpolar Deep Water onto the continental shelf under poleward-intensified winds leading to a shorter sea ice season and ocean warming at the continental margin. Under this scenario, the extreme warming we observe likely reflects the extensively modified oceanic and hydrological circulation patterns following ice sheet collapse. Our work highlights the sensitivity of the Antarctic ice sheets to relatively minor oceanic and/or atmospheric perturbations that could be at play in the near future. Conference Object Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic East Antarctic Ice Sheet Southern Ocean The Antarctic West Antarctic Ice Sheet |