Export and circulation of ice cavity water in Pine Island Bay, West Antarctica
Large sectors of the Antarctic ice sheet are vulnerable to increases in melting at the bases of fringing ice shelves, with melt rates depending on ocean temperatures and circulations in the sub-ice cavities. Here we analyze an oceanographic data set obtained in austral summer 2009 in Pine Island Bay...
Published in: | Journal of Geophysical Research: Oceans |
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ftnerc:oai:nora.nerc.ac.uk:507555 2023-05-15T13:48:08+02:00 Export and circulation of ice cavity water in Pine Island Bay, West Antarctica Thurnherr, A. M. Jacobs, S. S. Dutrieux, P. Giulivi, C. F. 2014-03-11 text http://nora.nerc.ac.uk/id/eprint/507555/ https://nora.nerc.ac.uk/id/eprint/507555/1/jgrc20608.pdf https://doi.org/10.1002/2013JC009307 en eng Wiley https://nora.nerc.ac.uk/id/eprint/507555/1/jgrc20608.pdf Thurnherr, A. M.; Jacobs, S. S.; Dutrieux, P. orcid:0000-0002-8066-934X Giulivi, C. F. 2014 Export and circulation of ice cavity water in Pine Island Bay, West Antarctica. Journal of Geophysical Research: Oceans, 119 (3). 1754-1764. https://doi.org/10.1002/2013JC009307 <https://doi.org/10.1002/2013JC009307> Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.1002/2013JC009307 2023-02-04T19:39:49Z Large sectors of the Antarctic ice sheet are vulnerable to increases in melting at the bases of fringing ice shelves, with melt rates depending on ocean temperatures and circulations in the sub-ice cavities. Here we analyze an oceanographic data set obtained in austral summer 2009 in Pine Island Bay, which is bounded in the east by the calving front of the Amundsen Sea's fast-moving Pine Island Ice Shelf. The upper-ocean velocity field in the ice-free bay was dominated by a 700 m deep and 50 km wide gyre circulating 1.5 Sv of water clockwise around the bay. Ice cavity water was observed in a surface-intensified and southward-intensified boundary current along the ice front, and in a small ice cove at the end of the southern shear margin of the ice shelf. Repeat measurements in the cove reveal persistent cavity water export of ≈ 0.25 Sv during 10 days of sampling. Vertical velocities in the cove above the ice draft were dominated by buoyancy-frequency oscillations with amplitudes of several cm/s but without significant net upwelling. In combination with the seawater properties, this observation indicates that much of the upwelling occurs within fractured ice near the cove, potentially contributing to weakening the ice shelf shear margin. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Bay West Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Austral West Antarctica Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) Journal of Geophysical Research: Oceans 119 3 1754 1764 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Large sectors of the Antarctic ice sheet are vulnerable to increases in melting at the bases of fringing ice shelves, with melt rates depending on ocean temperatures and circulations in the sub-ice cavities. Here we analyze an oceanographic data set obtained in austral summer 2009 in Pine Island Bay, which is bounded in the east by the calving front of the Amundsen Sea's fast-moving Pine Island Ice Shelf. The upper-ocean velocity field in the ice-free bay was dominated by a 700 m deep and 50 km wide gyre circulating 1.5 Sv of water clockwise around the bay. Ice cavity water was observed in a surface-intensified and southward-intensified boundary current along the ice front, and in a small ice cove at the end of the southern shear margin of the ice shelf. Repeat measurements in the cove reveal persistent cavity water export of ≈ 0.25 Sv during 10 days of sampling. Vertical velocities in the cove above the ice draft were dominated by buoyancy-frequency oscillations with amplitudes of several cm/s but without significant net upwelling. In combination with the seawater properties, this observation indicates that much of the upwelling occurs within fractured ice near the cove, potentially contributing to weakening the ice shelf shear margin. |
format |
Article in Journal/Newspaper |
author |
Thurnherr, A. M. Jacobs, S. S. Dutrieux, P. Giulivi, C. F. |
spellingShingle |
Thurnherr, A. M. Jacobs, S. S. Dutrieux, P. Giulivi, C. F. Export and circulation of ice cavity water in Pine Island Bay, West Antarctica |
author_facet |
Thurnherr, A. M. Jacobs, S. S. Dutrieux, P. Giulivi, C. F. |
author_sort |
Thurnherr, A. M. |
title |
Export and circulation of ice cavity water in Pine Island Bay, West Antarctica |
title_short |
Export and circulation of ice cavity water in Pine Island Bay, West Antarctica |
title_full |
Export and circulation of ice cavity water in Pine Island Bay, West Antarctica |
title_fullStr |
Export and circulation of ice cavity water in Pine Island Bay, West Antarctica |
title_full_unstemmed |
Export and circulation of ice cavity water in Pine Island Bay, West Antarctica |
title_sort |
export and circulation of ice cavity water in pine island bay, west antarctica |
publisher |
Wiley |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/507555/ https://nora.nerc.ac.uk/id/eprint/507555/1/jgrc20608.pdf https://doi.org/10.1002/2013JC009307 |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
geographic |
Antarctic The Antarctic Austral West Antarctica Island Bay Pine Island Bay |
geographic_facet |
Antarctic The Antarctic Austral West Antarctica Island Bay Pine Island Bay |
genre |
Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Bay West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Bay West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/507555/1/jgrc20608.pdf Thurnherr, A. M.; Jacobs, S. S.; Dutrieux, P. orcid:0000-0002-8066-934X Giulivi, C. F. 2014 Export and circulation of ice cavity water in Pine Island Bay, West Antarctica. Journal of Geophysical Research: Oceans, 119 (3). 1754-1764. https://doi.org/10.1002/2013JC009307 <https://doi.org/10.1002/2013JC009307> |
op_doi |
https://doi.org/10.1002/2013JC009307 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
3 |
container_start_page |
1754 |
op_container_end_page |
1764 |
_version_ |
1766248764008300544 |