Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough
The presence of warm Circumpolar Deep Water (CDW) intrusions on the Amundsen continental shelf has been linked to recent thinning of the outlet glaciers draining the West Antarctic ice sheet into the Amundsen Sea. Inflow of the CDW onto the shelf is thought to occur within a series of troughs that i...
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American Geophysical Union
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ftnerc:oai:nora.nerc.ac.uk:500362 2023-05-15T13:23:53+02:00 Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough Assmann, K.M. Jenkins, A. Shoosmith, D. Walker, D.P. Jacobs, S.S. Nicholls, K.W. 2013-12 text http://nora.nerc.ac.uk/id/eprint/500362/ https://nora.nerc.ac.uk/id/eprint/500362/1/jgrc20429.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013JC008871 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/500362/1/jgrc20429.pdf Assmann, K.M.; Jenkins, A. orcid:0000-0002-9117-0616 Shoosmith, D.; Walker, D.P.; Jacobs, S.S.; Nicholls, K.W. orcid:0000-0002-2188-4509 . 2013 Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough. Journal of Geophysical Research: Oceans, 118 (12). 6603-6620. https://doi.org/10.1002/2013JC008871 <https://doi.org/10.1002/2013JC008871> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1002/2013JC008871 2023-02-04T19:36:21Z The presence of warm Circumpolar Deep Water (CDW) intrusions on the Amundsen continental shelf has been linked to recent thinning of the outlet glaciers draining the West Antarctic ice sheet into the Amundsen Sea. Inflow of the CDW onto the shelf is thought to occur within a series of troughs that intersect the continental shelf break. We use observations between 1994 and 2011 and a numerical model to investigate the variability of CDW transport in a trough intersecting the shelf break at 113W. The location of the main CDW inflow into the trough varies between its eastern flank and centre, while the western part of the trough is filled by a re-circulation that commonly entrains cooler water originating further south on the shelf. Thermocline depth decreases between the early and late 2000s with an indication that the depth of the 1994 thermocline was similar to the later years. Mooring results show that the CDW layer cools and thins in summer and thickens and warms in winter. In addition to a deeper thermocline in summer, we observe a stronger presence of Lower CDW in the bottom of the trough. Heat flux onto the shelf is controlled by current velocities rather than CDW temperature and the majority of the heat is carried onto the shelf by background flow rather than episodic events. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Natural Environment Research Council: NERC Open Research Archive Antarctic Amundsen Sea West Antarctic Ice Sheet Journal of Geophysical Research: Oceans 118 12 6603 6620 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The presence of warm Circumpolar Deep Water (CDW) intrusions on the Amundsen continental shelf has been linked to recent thinning of the outlet glaciers draining the West Antarctic ice sheet into the Amundsen Sea. Inflow of the CDW onto the shelf is thought to occur within a series of troughs that intersect the continental shelf break. We use observations between 1994 and 2011 and a numerical model to investigate the variability of CDW transport in a trough intersecting the shelf break at 113W. The location of the main CDW inflow into the trough varies between its eastern flank and centre, while the western part of the trough is filled by a re-circulation that commonly entrains cooler water originating further south on the shelf. Thermocline depth decreases between the early and late 2000s with an indication that the depth of the 1994 thermocline was similar to the later years. Mooring results show that the CDW layer cools and thins in summer and thickens and warms in winter. In addition to a deeper thermocline in summer, we observe a stronger presence of Lower CDW in the bottom of the trough. Heat flux onto the shelf is controlled by current velocities rather than CDW temperature and the majority of the heat is carried onto the shelf by background flow rather than episodic events. |
format |
Article in Journal/Newspaper |
author |
Assmann, K.M. Jenkins, A. Shoosmith, D. Walker, D.P. Jacobs, S.S. Nicholls, K.W. |
spellingShingle |
Assmann, K.M. Jenkins, A. Shoosmith, D. Walker, D.P. Jacobs, S.S. Nicholls, K.W. Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough |
author_facet |
Assmann, K.M. Jenkins, A. Shoosmith, D. Walker, D.P. Jacobs, S.S. Nicholls, K.W. |
author_sort |
Assmann, K.M. |
title |
Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough |
title_short |
Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough |
title_full |
Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough |
title_fullStr |
Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough |
title_full_unstemmed |
Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough |
title_sort |
variability of circumpolar deep water transport onto the amundsen sea continental shelf through a shelf break trough |
publisher |
American Geophysical Union |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/500362/ https://nora.nerc.ac.uk/id/eprint/500362/1/jgrc20429.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013JC008871 |
geographic |
Antarctic Amundsen Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Amundsen Sea West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/500362/1/jgrc20429.pdf Assmann, K.M.; Jenkins, A. orcid:0000-0002-9117-0616 Shoosmith, D.; Walker, D.P.; Jacobs, S.S.; Nicholls, K.W. orcid:0000-0002-2188-4509 . 2013 Variability of circumpolar deep water transport onto the Amundsen Sea continental shelf through a shelf break trough. Journal of Geophysical Research: Oceans, 118 (12). 6603-6620. https://doi.org/10.1002/2013JC008871 <https://doi.org/10.1002/2013JC008871> |
op_doi |
https://doi.org/10.1002/2013JC008871 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
12 |
container_start_page |
6603 |
op_container_end_page |
6620 |
_version_ |
1766376080667574272 |