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...
Published in: | Climate of the Past |
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Online Access: | http://www.osti.gov/servlets/purl/1852098 https://www.osti.gov/biblio/1852098 https://doi.org/10.5194/cp-17-1-2021 |
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ftosti:oai:osti.gov:1852098 2023-07-30T03:59:22+02:00 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. 2023-07-04 application/pdf http://www.osti.gov/servlets/purl/1852098 https://www.osti.gov/biblio/1852098 https://doi.org/10.5194/cp-17-1-2021 unknown http://www.osti.gov/servlets/purl/1852098 https://www.osti.gov/biblio/1852098 https://doi.org/10.5194/cp-17-1-2021 doi:10.5194/cp-17-1-2021 58 GEOSCIENCES 2023 ftosti https://doi.org/10.5194/cp-17-1-2021 2023-07-11T10:10:50Z 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. Other/Unknown Material Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Antarctic The Antarctic East Antarctica Climate of the Past 17 1 1 19 |
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Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
58 GEOSCIENCES |
spellingShingle |
58 GEOSCIENCES 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 |
58 GEOSCIENCES |
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. |
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 |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1852098 https://www.osti.gov/biblio/1852098 https://doi.org/10.5194/cp-17-1-2021 |
geographic |
Antarctic The Antarctic East Antarctica |
geographic_facet |
Antarctic The Antarctic East Antarctica |
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 |
http://www.osti.gov/servlets/purl/1852098 https://www.osti.gov/biblio/1852098 https://doi.org/10.5194/cp-17-1-2021 doi:10.5194/cp-17-1-2021 |
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_ |
1772810151306199040 |