The Amundsen Sea and the Antarctic Ice Sheet
A few decades ago, Antarctic ice sheets were expected to grow as the atmosphere warmed and increasing poleward moisture transport added snowfall to regions that would remain below freezing year-round. Concerns about their sensitivity to climate change were centered on air temperature and on glaciall...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Oceanography Society
2012-09-01
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| Series: | Oceanography |
| Subjects: | |
| Online Access: | http://tos.org/oceanography/archive/25-3_jacobs.pdf |
| _version_ | 1828888274054152192 |
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| author | Stan Jacobs Adrian Jenkins Hartmut Hellmer Claudia Giulivi Frank Nitsche Bruce Huber Raul Guerrero |
| author_facet | Stan Jacobs Adrian Jenkins Hartmut Hellmer Claudia Giulivi Frank Nitsche Bruce Huber Raul Guerrero |
| author_sort | Stan Jacobs |
| collection | DOAJ |
| description | A few decades ago, Antarctic ice sheets were expected to grow as the atmosphere warmed and increasing poleward moisture transport added snowfall to regions that would remain below freezing year-round. Concerns about their sensitivity to climate change were centered on air temperature and on glacially paced ice dynamics. Southern Ocean roles were relegated to iceberg transport, a mix of melting and freezing under ice shelves buffered by the frigid shelf waters generated by sea ice production, and slow sea level rise by other forcing. At that time, observations were lacking in the remote Amundsen Sea, where difficult ice conditions have vexed explorers for more than 200 years. Mapping of its ocean structure and circulation began in 1994, revealing that "warm" Circumpolar Deep Water has access to its continental shelf. Glacially scoured troughs in the seafloor provide conduits for that seawater to melt regional ice shelves far more rapidly near their deep grounding lines. Coincident satellite data showed the ice shelves were thinning, in turn leading to accelerated glacier flow and loss of grounded ice to the sea. Repeated measurements and modeling suggest ocean changes that could impact the stability of the marine-based West Antarctic Ice Sheet. |
| first_indexed | 2024-12-13T12:19:44Z |
| format | Article |
| id | doaj.art-6c8b4c8c0534426795103c0f49625d0c |
| institution | Directory Open Access Journal |
| issn | 1042-8275 |
| language | English |
| last_indexed | 2024-12-13T12:19:44Z |
| publishDate | 2012-09-01 |
| publisher | The Oceanography Society |
| record_format | Article |
| series | Oceanography |
| spelling | doaj.art-6c8b4c8c0534426795103c0f49625d0c2022-12-21T23:46:36ZengThe Oceanography SocietyOceanography1042-82752012-09-01253154163The Amundsen Sea and the Antarctic Ice SheetStan JacobsAdrian JenkinsHartmut HellmerClaudia GiuliviFrank NitscheBruce HuberRaul GuerreroA few decades ago, Antarctic ice sheets were expected to grow as the atmosphere warmed and increasing poleward moisture transport added snowfall to regions that would remain below freezing year-round. Concerns about their sensitivity to climate change were centered on air temperature and on glacially paced ice dynamics. Southern Ocean roles were relegated to iceberg transport, a mix of melting and freezing under ice shelves buffered by the frigid shelf waters generated by sea ice production, and slow sea level rise by other forcing. At that time, observations were lacking in the remote Amundsen Sea, where difficult ice conditions have vexed explorers for more than 200 years. Mapping of its ocean structure and circulation began in 1994, revealing that "warm" Circumpolar Deep Water has access to its continental shelf. Glacially scoured troughs in the seafloor provide conduits for that seawater to melt regional ice shelves far more rapidly near their deep grounding lines. Coincident satellite data showed the ice shelves were thinning, in turn leading to accelerated glacier flow and loss of grounded ice to the sea. Repeated measurements and modeling suggest ocean changes that could impact the stability of the marine-based West Antarctic Ice Sheet.http://tos.org/oceanography/archive/25-3_jacobs.pdfAntarcticaWest Antarctic Ice SheetSouthern OceanCircumpolar Deep Water |
| spellingShingle | Stan Jacobs Adrian Jenkins Hartmut Hellmer Claudia Giulivi Frank Nitsche Bruce Huber Raul Guerrero The Amundsen Sea and the Antarctic Ice Sheet Oceanography Antarctica West Antarctic Ice Sheet Southern Ocean Circumpolar Deep Water |
| title | The Amundsen Sea and the Antarctic Ice Sheet |
| title_full | The Amundsen Sea and the Antarctic Ice Sheet |
| title_fullStr | The Amundsen Sea and the Antarctic Ice Sheet |
| title_full_unstemmed | The Amundsen Sea and the Antarctic Ice Sheet |
| title_short | The Amundsen Sea and the Antarctic Ice Sheet |
| title_sort | amundsen sea and the antarctic ice sheet |
| topic | Antarctica West Antarctic Ice Sheet Southern Ocean Circumpolar Deep Water |
| url | http://tos.org/oceanography/archive/25-3_jacobs.pdf |
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