Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat
International audience Over recent decades Antarctic sea-ice extent has increased, alongside widespread ice shelf thinning and freshening of waters along the Antarctic margin. In contrast, Earth system models generally simulate a decrease in sea ice. Circulation of water masses beneath large-cavity...
Published in: | Climate of the Past |
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Online Access: | https://hal.science/hal-03102309 https://hal.science/hal-03102309/document https://hal.science/hal-03102309/file/Ashley_CP2020.pdf https://doi.org/10.5194/cp-17-1-2021 |
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ftecolephe:oai:HAL:hal-03102309v1 2024-05-19T07:29:05+00:00 Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat Ashley, Kate, E Mckay, Robert Etourneau, Johan Jimenez-Espejo, Francisco, J Condron, Alan Albot, Anna Crosta, Xavier Riesselman, Christina Seki, Osamu Massé, Guillaume Golledge, Nicholas, R Gasson, Edward Lowry, Daniel, P Barrand, Nicholas, E Johnson, Katelyn Bertler, Nancy Escutia, Carlota Dunbar, Robert Bendle, James, A Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2021-01-05 https://hal.science/hal-03102309 https://hal.science/hal-03102309/document https://hal.science/hal-03102309/file/Ashley_CP2020.pdf https://doi.org/10.5194/cp-17-1-2021 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-1-2021 hal-03102309 https://hal.science/hal-03102309 https://hal.science/hal-03102309/document https://hal.science/hal-03102309/file/Ashley_CP2020.pdf doi:10.5194/cp-17-1-2021 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03102309 Climate of the Past, 2021, 17, pp.1 - 19. ⟨10.5194/cp-17-1-2021⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2021 ftecolephe https://doi.org/10.5194/cp-17-1-2021 2024-04-25T01:34:06Z International audience Over recent decades Antarctic sea-ice extent has increased, alongside widespread ice shelf thinning and freshening of waters along the Antarctic margin. In contrast, Earth system models generally simulate a decrease in sea ice. Circulation of water masses beneath large-cavity ice shelves is not included in current Earth System models and may be a driver of this phenomena. We examine a Holocene sediment core off East Antarctica that records the Neoglacial transition, the last major baseline shift of Antarctic sea ice, and part of a late-Holocene global cooling trend. We provide a multiproxy record of Holocene glacial meltwater input, sediment transport, and sea-ice variability. Our record, supported by high-resolution ocean modelling, shows that a rapid Antarctic sea-ice increase during the mid-Holocene (∼ 4.5 ka) occurred against a backdrop of increasing glacial meltwater input and gradual climate warming. We suggest that mid-Holocene ice shelf cavity expansion led to cooling of surface waters and sea-ice growth that slowed basal ice shelf melting. Incorporating this feedback mechanism into global climate models will be important for future projections of Antarctic changes. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice EPHE (Ecole pratique des hautes études, Paris): HAL Climate of the Past 17 1 1 19 |
institution |
Open Polar |
collection |
EPHE (Ecole pratique des hautes études, Paris): HAL |
op_collection_id |
ftecolephe |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Ashley, Kate, E Mckay, Robert Etourneau, Johan Jimenez-Espejo, Francisco, J Condron, Alan Albot, Anna Crosta, Xavier Riesselman, Christina Seki, Osamu Massé, Guillaume Golledge, Nicholas, R Gasson, Edward Lowry, Daniel, P Barrand, Nicholas, E Johnson, Katelyn Bertler, Nancy Escutia, Carlota Dunbar, Robert Bendle, James, A Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Over recent decades Antarctic sea-ice extent has increased, alongside widespread ice shelf thinning and freshening of waters along the Antarctic margin. In contrast, Earth system models generally simulate a decrease in sea ice. Circulation of water masses beneath large-cavity ice shelves is not included in current Earth System models and may be a driver of this phenomena. We examine a Holocene sediment core off East Antarctica that records the Neoglacial transition, the last major baseline shift of Antarctic sea ice, and part of a late-Holocene global cooling trend. We provide a multiproxy record of Holocene glacial meltwater input, sediment transport, and sea-ice variability. Our record, supported by high-resolution ocean modelling, shows that a rapid Antarctic sea-ice increase during the mid-Holocene (∼ 4.5 ka) occurred against a backdrop of increasing glacial meltwater input and gradual climate warming. We suggest that mid-Holocene ice shelf cavity expansion led to cooling of surface waters and sea-ice growth that slowed basal ice shelf melting. Incorporating this feedback mechanism into global climate models will be important for future projections of Antarctic changes. |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ashley, Kate, E Mckay, Robert Etourneau, Johan Jimenez-Espejo, Francisco, J Condron, Alan Albot, Anna Crosta, Xavier Riesselman, Christina Seki, Osamu Massé, Guillaume Golledge, Nicholas, R Gasson, Edward Lowry, Daniel, P Barrand, Nicholas, E Johnson, Katelyn Bertler, Nancy Escutia, Carlota Dunbar, Robert Bendle, James, A |
author_facet |
Ashley, Kate, E Mckay, Robert Etourneau, Johan Jimenez-Espejo, Francisco, J Condron, Alan Albot, Anna Crosta, Xavier Riesselman, Christina Seki, Osamu Massé, Guillaume Golledge, Nicholas, R Gasson, Edward Lowry, Daniel, P Barrand, Nicholas, E Johnson, Katelyn Bertler, Nancy Escutia, Carlota Dunbar, Robert Bendle, James, A |
author_sort |
Ashley, Kate, E |
title |
Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat |
title_short |
Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat |
title_full |
Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat |
title_fullStr |
Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat |
title_full_unstemmed |
Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat |
title_sort |
mid-holocene antarctic sea-ice increase driven by marine ice sheet retreat |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03102309 https://hal.science/hal-03102309/document https://hal.science/hal-03102309/file/Ashley_CP2020.pdf https://doi.org/10.5194/cp-17-1-2021 |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03102309 Climate of the Past, 2021, 17, pp.1 - 19. ⟨10.5194/cp-17-1-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-1-2021 hal-03102309 https://hal.science/hal-03102309 https://hal.science/hal-03102309/document https://hal.science/hal-03102309/file/Ashley_CP2020.pdf doi:10.5194/cp-17-1-2021 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-17-1-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
19 |
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1799477457436278784 |