Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea
Mass loss from the Antarctic Ice Sheet is driven by changes at the marine margins. In the Amundsen Sea, thinning of the ice shelves has allowed the outlet glaciers to accelerate and thin, resulting in inland migration of their grounding lines. The ultimate driver is often assumed to be ocean warming...
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ftnerc:oai:nora.nerc.ac.uk:513877 2023-05-15T13:23:38+02:00 Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea Jenkins, Adrian Dutrieux, Pierre Jacobs, Stan Steig, Eric J. Gudmundsson, G. Hilmar Smith, James Heywood, Karen J. 2016-12 text http://nora.nerc.ac.uk/id/eprint/513877/ https://nora.nerc.ac.uk/id/eprint/513877/1/29-4_jenkins.pdf http://www.tos.org/oceanography/article/decadal-ocean-forcing-and-antarctic-ice-sheet-response-lessons-from-the-amu en eng Oceanography Society https://nora.nerc.ac.uk/id/eprint/513877/1/29-4_jenkins.pdf Jenkins, Adrian orcid:0000-0002-9117-0616 Dutrieux, Pierre; Jacobs, Stan; Steig, Eric J.; Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 Smith, James orcid:0000-0002-1333-2544 Heywood, Karen J. 2016 Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea. Oceanography, 29 (4). 106-117. https://doi.org/10.5670/oceanog.2016.103 <https://doi.org/10.5670/oceanog.2016.103> Publication - Article PeerReviewed 2016 ftnerc https://doi.org/10.5670/oceanog.2016.103 2023-02-04T19:43:10Z Mass loss from the Antarctic Ice Sheet is driven by changes at the marine margins. In the Amundsen Sea, thinning of the ice shelves has allowed the outlet glaciers to accelerate and thin, resulting in inland migration of their grounding lines. The ultimate driver is often assumed to be ocean warming, but the recent record of ocean temperature is dominated by decadal variability rather than a trend. The distribution of water masses on the Amundsen Sea continental shelf is particularly sensitive to atmospheric forcing, while the regional atmospheric circulation is highly variable, at least in part because of the impact of tropical variability. Changes in atmospheric circulation force changes in ice shelf melting, which drive step-wise movement of the grounding line between localized high points on the bed. When the grounding line is located on a high point, outlet glacier flow is sensitive to atmosphere-ocean variability, but once retreat or advance to the next high point has been triggered, ocean circulation and melt rate changes associated with the evolution in geometry of the sub-ice-shelf cavity dominate, and the sensitivity to atmospheric forcing is greatly reduced. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Amundsen Sea Oceanography 29 4 106 117 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Mass loss from the Antarctic Ice Sheet is driven by changes at the marine margins. In the Amundsen Sea, thinning of the ice shelves has allowed the outlet glaciers to accelerate and thin, resulting in inland migration of their grounding lines. The ultimate driver is often assumed to be ocean warming, but the recent record of ocean temperature is dominated by decadal variability rather than a trend. The distribution of water masses on the Amundsen Sea continental shelf is particularly sensitive to atmospheric forcing, while the regional atmospheric circulation is highly variable, at least in part because of the impact of tropical variability. Changes in atmospheric circulation force changes in ice shelf melting, which drive step-wise movement of the grounding line between localized high points on the bed. When the grounding line is located on a high point, outlet glacier flow is sensitive to atmosphere-ocean variability, but once retreat or advance to the next high point has been triggered, ocean circulation and melt rate changes associated with the evolution in geometry of the sub-ice-shelf cavity dominate, and the sensitivity to atmospheric forcing is greatly reduced. |
format |
Article in Journal/Newspaper |
author |
Jenkins, Adrian Dutrieux, Pierre Jacobs, Stan Steig, Eric J. Gudmundsson, G. Hilmar Smith, James Heywood, Karen J. |
spellingShingle |
Jenkins, Adrian Dutrieux, Pierre Jacobs, Stan Steig, Eric J. Gudmundsson, G. Hilmar Smith, James Heywood, Karen J. Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea |
author_facet |
Jenkins, Adrian Dutrieux, Pierre Jacobs, Stan Steig, Eric J. Gudmundsson, G. Hilmar Smith, James Heywood, Karen J. |
author_sort |
Jenkins, Adrian |
title |
Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea |
title_short |
Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea |
title_full |
Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea |
title_fullStr |
Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea |
title_full_unstemmed |
Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea |
title_sort |
decadal ocean forcing and antarctic ice sheet response: lessons from the amundsen sea |
publisher |
Oceanography Society |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/513877/ https://nora.nerc.ac.uk/id/eprint/513877/1/29-4_jenkins.pdf http://www.tos.org/oceanography/article/decadal-ocean-forcing-and-antarctic-ice-sheet-response-lessons-from-the-amu |
geographic |
Antarctic The Antarctic Amundsen Sea |
geographic_facet |
Antarctic The Antarctic Amundsen Sea |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves |
op_relation |
https://nora.nerc.ac.uk/id/eprint/513877/1/29-4_jenkins.pdf Jenkins, Adrian orcid:0000-0002-9117-0616 Dutrieux, Pierre; Jacobs, Stan; Steig, Eric J.; Gudmundsson, G. Hilmar orcid:0000-0003-4236-5369 Smith, James orcid:0000-0002-1333-2544 Heywood, Karen J. 2016 Decadal Ocean Forcing and Antarctic Ice Sheet Response: Lessons from the Amundsen Sea. Oceanography, 29 (4). 106-117. https://doi.org/10.5670/oceanog.2016.103 <https://doi.org/10.5670/oceanog.2016.103> |
op_doi |
https://doi.org/10.5670/oceanog.2016.103 |
container_title |
Oceanography |
container_volume |
29 |
container_issue |
4 |
container_start_page |
106 |
op_container_end_page |
117 |
_version_ |
1766373744769499136 |