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...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D83N22TV 2023-05-15T13:41:09+02:00 Export and circulation of ice cavity water in Pine Island Bay, West Antarctica Thurnherr, Andreas M. Jacobs, S. S. Dutrieux, P. Giulivi, Claudia 2014 https://doi.org/10.7916/D83N22TV English eng https://doi.org/10.7916/D83N22TV Sea ice Geophysics Ocean temperature Oceanography Articles 2014 ftcolumbiauniv https://doi.org/10.7916/D83N22TV 2019-04-04T08:13:19Z 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 Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Bay Sea ice West Antarctica Columbia University: Academic Commons Antarctic Austral Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) The Antarctic West Antarctica |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Sea ice Geophysics Ocean temperature Oceanography |
spellingShingle |
Sea ice Geophysics Ocean temperature Oceanography Thurnherr, Andreas M. Jacobs, S. S. Dutrieux, P. Giulivi, Claudia Export and circulation of ice cavity water in Pine Island Bay, West Antarctica |
topic_facet |
Sea ice Geophysics Ocean temperature Oceanography |
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, Andreas M. Jacobs, S. S. Dutrieux, P. Giulivi, Claudia |
author_facet |
Thurnherr, Andreas M. Jacobs, S. S. Dutrieux, P. Giulivi, Claudia |
author_sort |
Thurnherr, Andreas 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 |
publishDate |
2014 |
url |
https://doi.org/10.7916/D83N22TV |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) |
geographic |
Antarctic Austral Island Bay Pine Island Bay The Antarctic West Antarctica |
geographic_facet |
Antarctic Austral Island Bay Pine Island Bay The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Bay Sea ice West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Bay Sea ice West Antarctica |
op_relation |
https://doi.org/10.7916/D83N22TV |
op_doi |
https://doi.org/10.7916/D83N22TV |
_version_ |
1766146107248738304 |