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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ftdatacite:10.7916/d83n22tv 2023-05-15T13:42:20+02:00 Export and circulation of ice cavity water in Pine Island Bay, West Antarctica Thurnherr, Andreas M. Jacobs, S. S. Dutrieux, Pierre Giulivi, Claudia 2014 https://dx.doi.org/10.7916/d83n22tv https://academiccommons.columbia.edu/doi/10.7916/D83N22TV unknown Columbia University https://dx.doi.org/10.1002/2013jc009307 Sea ice Geophysics Ocean temperature Oceanography Text Articles article-journal ScholarlyArticle 2014 ftdatacite https://doi.org/10.7916/d83n22tv https://doi.org/10.1002/2013jc009307 2021-11-05T12:55:41Z 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. Text Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Bay Sea ice West Antarctica DataCite Metadata Store (German National Library of Science and Technology) 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) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Sea ice Geophysics Ocean temperature Oceanography |
spellingShingle |
Sea ice Geophysics Ocean temperature Oceanography Thurnherr, Andreas M. Jacobs, S. S. Dutrieux, Pierre 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 |
Text |
author |
Thurnherr, Andreas M. Jacobs, S. S. Dutrieux, Pierre Giulivi, Claudia |
author_facet |
Thurnherr, Andreas M. Jacobs, S. S. Dutrieux, Pierre 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 |
publisher |
Columbia University |
publishDate |
2014 |
url |
https://dx.doi.org/10.7916/d83n22tv https://academiccommons.columbia.edu/doi/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 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 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://dx.doi.org/10.1002/2013jc009307 |
op_doi |
https://doi.org/10.7916/d83n22tv https://doi.org/10.1002/2013jc009307 |
_version_ |
1766166548624441344 |