Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations
Antarctica's ice shelves resist the flow of grounded ice towards the ocean through “buttressing” arising from their contact with ice rises, rumples, and lateral margins. Ice shelf thinning and retreat reduce buttressing, leading to increased delivery of mass to the ocean that adds to global sea...
Published in: | The Cryosphere |
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00067553 2023-07-30T03:56:37+02:00 Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations Mosbeux, Cyrille Padman, Laurie Klein, Emilie Bromirski, Peter D. Fricker, Helen A. 2023-07 electronic https://doi.org/10.5194/tc-17-2585-2023 https://noa.gwlb.de/receive/cop_mods_00067553 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066006/tc-17-2585-2023.pdf https://tc.copernicus.org/articles/17/2585/2023/tc-17-2585-2023.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-17-2585-2023 https://noa.gwlb.de/receive/cop_mods_00067553 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066006/tc-17-2585-2023.pdf https://tc.copernicus.org/articles/17/2585/2023/tc-17-2585-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/tc-17-2585-2023 2023-07-09T23:19:02Z Antarctica's ice shelves resist the flow of grounded ice towards the ocean through “buttressing” arising from their contact with ice rises, rumples, and lateral margins. Ice shelf thinning and retreat reduce buttressing, leading to increased delivery of mass to the ocean that adds to global sea level. Ice shelf response to large annual cycles in atmospheric and oceanic processes provides opportunities to study the dynamics of both ice shelves and the buttressed grounded ice. Here, we explore whether seasonal variability of sea surface height (SSH) can explain observed seasonal variability of ice velocity. We investigate this hypothesis using several time series of ice velocity from the Ross Ice Shelf (RIS), satellite-based estimates of SSH seaward of the RIS front, ocean models of SSH under and near RIS, and a viscous ice sheet model. The observed annual changes in RIS velocity are of the order of 1–10 m a−1 (roughly 1 % of mean flow). The ice sheet model, forced by the observed and modelled range of SSH of about 10 cm, reproduces the observed velocity changes when sufficiently large basal drag changes near the grounding line are parameterised. The model response is dominated by grounding line migration but with a significant contribution from SSH-induced tilt of the ice shelf. We expect that climate-driven changes in the seasonal cycles of winds and upper-ocean summer warming will modify the seasonal response of ice shelves to SSH and that nonlinear responses of the ice sheet will affect the longer trend in ice sheet response and its potential sea-level rise contribution. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Ross Ice Shelf The Cryosphere Niedersächsisches Online-Archiv NOA Antarctic Ross Ice Shelf The Cryosphere 17 7 2585 2606 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Mosbeux, Cyrille Padman, Laurie Klein, Emilie Bromirski, Peter D. Fricker, Helen A. Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations |
topic_facet |
article Verlagsveröffentlichung |
description |
Antarctica's ice shelves resist the flow of grounded ice towards the ocean through “buttressing” arising from their contact with ice rises, rumples, and lateral margins. Ice shelf thinning and retreat reduce buttressing, leading to increased delivery of mass to the ocean that adds to global sea level. Ice shelf response to large annual cycles in atmospheric and oceanic processes provides opportunities to study the dynamics of both ice shelves and the buttressed grounded ice. Here, we explore whether seasonal variability of sea surface height (SSH) can explain observed seasonal variability of ice velocity. We investigate this hypothesis using several time series of ice velocity from the Ross Ice Shelf (RIS), satellite-based estimates of SSH seaward of the RIS front, ocean models of SSH under and near RIS, and a viscous ice sheet model. The observed annual changes in RIS velocity are of the order of 1–10 m a−1 (roughly 1 % of mean flow). The ice sheet model, forced by the observed and modelled range of SSH of about 10 cm, reproduces the observed velocity changes when sufficiently large basal drag changes near the grounding line are parameterised. The model response is dominated by grounding line migration but with a significant contribution from SSH-induced tilt of the ice shelf. We expect that climate-driven changes in the seasonal cycles of winds and upper-ocean summer warming will modify the seasonal response of ice shelves to SSH and that nonlinear responses of the ice sheet will affect the longer trend in ice sheet response and its potential sea-level rise contribution. |
format |
Article in Journal/Newspaper |
author |
Mosbeux, Cyrille Padman, Laurie Klein, Emilie Bromirski, Peter D. Fricker, Helen A. |
author_facet |
Mosbeux, Cyrille Padman, Laurie Klein, Emilie Bromirski, Peter D. Fricker, Helen A. |
author_sort |
Mosbeux, Cyrille |
title |
Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations |
title_short |
Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations |
title_full |
Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations |
title_fullStr |
Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations |
title_full_unstemmed |
Seasonal variability in Antarctic ice shelf velocities forced by sea surface height variations |
title_sort |
seasonal variability in antarctic ice shelf velocities forced by sea surface height variations |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-2585-2023 https://noa.gwlb.de/receive/cop_mods_00067553 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066006/tc-17-2585-2023.pdf https://tc.copernicus.org/articles/17/2585/2023/tc-17-2585-2023.pdf |
geographic |
Antarctic Ross Ice Shelf |
geographic_facet |
Antarctic Ross Ice Shelf |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Ross Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Ross Ice Shelf The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-17-2585-2023 https://noa.gwlb.de/receive/cop_mods_00067553 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066006/tc-17-2585-2023.pdf https://tc.copernicus.org/articles/17/2585/2023/tc-17-2585-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-17-2585-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
7 |
container_start_page |
2585 |
op_container_end_page |
2606 |
_version_ |
1772813918015586304 |