Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat
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 incl...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00054918 2024-09-15T17:47:42+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. 2021-01 electronic https://doi.org/10.5194/cp-17-1-2021 https://noa.gwlb.de/receive/cop_mods_00054918 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054569/cp-17-1-2021.pdf https://cp.copernicus.org/articles/17/1/2021/cp-17-1-2021.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-17-1-2021 https://noa.gwlb.de/receive/cop_mods_00054918 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054569/cp-17-1-2021.pdf https://cp.copernicus.org/articles/17/1/2021/cp-17-1-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/cp-17-1-2021 2024-06-26T04:43:09Z 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 multi-proxy 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 Niedersächsisches Online-Archiv NOA Climate of the Past 17 1 1 19 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung 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 |
article Verlagsveröffentlichung |
description |
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 multi-proxy 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. |
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 |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1-2021 https://noa.gwlb.de/receive/cop_mods_00054918 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054569/cp-17-1-2021.pdf https://cp.copernicus.org/articles/17/1/2021/cp-17-1-2021.pdf |
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_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-17-1-2021 https://noa.gwlb.de/receive/cop_mods_00054918 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054569/cp-17-1-2021.pdf https://cp.copernicus.org/articles/17/1/2021/cp-17-1-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt 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 |
_version_ |
1810497181019275264 |