Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge
The Antarctic shelf seas are a climatically and ecologically important region, and are at present receiving increasing amounts of freshwater from the melting of the Antarctic Ice Sheet and its fringing ice shelves1,2, primarily around the Antarctic Peninsula and the Amudsen Sea. In response, the sur...
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:2017091 2023-05-15T13:38:01+02:00 Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge Rye, CD Naveira Garabato, AC Holland, PR Meredith, MP George Nurser, AJ Hughes, C Coward, AC Webb, DJ 2014-10-01 text http://livrepository.liverpool.ac.uk/2017091/ https://doi.org/10.1038/NGEO2230 http://livrepository.liverpool.ac.uk/2017091/1/Rye_et_al_NGeo_2014_Final_prepub.pdf en eng http://livrepository.liverpool.ac.uk/2017091/1/Rye_et_al_NGeo_2014_Final_prepub.pdf Rye, CD, Naveira Garabato, AC, Holland, PR, Meredith, MP, George Nurser, AJ, Hughes, C orcid:0000-0002-9355-0233 , Coward, AC and Webb, DJ (2014) Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge. Nature Geoscience, 7 (10). 732 - 735. Article PeerReviewed 2014 ftunivliverpool https://doi.org/10.1038/NGEO2230 2022-04-28T22:26:02Z The Antarctic shelf seas are a climatically and ecologically important region, and are at present receiving increasing amounts of freshwater from the melting of the Antarctic Ice Sheet and its fringing ice shelves1,2, primarily around the Antarctic Peninsula and the Amudsen Sea. In response, the surface ocean salinity in this region has declined in past decades3,4,5,6,7,8,9. Here, we assess the effects of the freshwater input on regional sea level using satellite measurements of sea surface height (for months with no sea-ice cover) and a global ocean circulation model. We find that from 1992 to 2011, sea-level rise along the Antarctic coast is at least 2 ± 0.8 mm yr−1 greater than the regional mean for the Southern Ocean south of 50° S. On the basis of the model simulations, we conclude that this sea-level rise is almost entirely related to steric adjustment, rather than changes in local ocean mass, with a halosteric rise in the upper ocean and thermosteric contributions at depth. We estimate that an excess freshwater input of 430 ± 230 Gt yr−1 is required to explain the observed sea-level rise. We conclude that accelerating discharge from the Antarctic Ice Sheet has had a pronounced and widespread impact on the adjacent subpolar seas over the past two decades. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Sheet Sea ice Southern Ocean The University of Liverpool Repository Antarctic Antarctic Peninsula Southern Ocean The Antarctic Nature Geoscience 7 10 732 735 |
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English |
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The Antarctic shelf seas are a climatically and ecologically important region, and are at present receiving increasing amounts of freshwater from the melting of the Antarctic Ice Sheet and its fringing ice shelves1,2, primarily around the Antarctic Peninsula and the Amudsen Sea. In response, the surface ocean salinity in this region has declined in past decades3,4,5,6,7,8,9. Here, we assess the effects of the freshwater input on regional sea level using satellite measurements of sea surface height (for months with no sea-ice cover) and a global ocean circulation model. We find that from 1992 to 2011, sea-level rise along the Antarctic coast is at least 2 ± 0.8 mm yr−1 greater than the regional mean for the Southern Ocean south of 50° S. On the basis of the model simulations, we conclude that this sea-level rise is almost entirely related to steric adjustment, rather than changes in local ocean mass, with a halosteric rise in the upper ocean and thermosteric contributions at depth. We estimate that an excess freshwater input of 430 ± 230 Gt yr−1 is required to explain the observed sea-level rise. We conclude that accelerating discharge from the Antarctic Ice Sheet has had a pronounced and widespread impact on the adjacent subpolar seas over the past two decades. |
format |
Article in Journal/Newspaper |
author |
Rye, CD Naveira Garabato, AC Holland, PR Meredith, MP George Nurser, AJ Hughes, C Coward, AC Webb, DJ |
spellingShingle |
Rye, CD Naveira Garabato, AC Holland, PR Meredith, MP George Nurser, AJ Hughes, C Coward, AC Webb, DJ Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge |
author_facet |
Rye, CD Naveira Garabato, AC Holland, PR Meredith, MP George Nurser, AJ Hughes, C Coward, AC Webb, DJ |
author_sort |
Rye, CD |
title |
Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge |
title_short |
Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge |
title_full |
Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge |
title_fullStr |
Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge |
title_full_unstemmed |
Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge |
title_sort |
rapid sea-level rise along the antarctic margins in response to increased glacial discharge |
publishDate |
2014 |
url |
http://livrepository.liverpool.ac.uk/2017091/ https://doi.org/10.1038/NGEO2230 http://livrepository.liverpool.ac.uk/2017091/1/Rye_et_al_NGeo_2014_Final_prepub.pdf |
geographic |
Antarctic Antarctic Peninsula Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet Sea ice Southern Ocean |
op_relation |
http://livrepository.liverpool.ac.uk/2017091/1/Rye_et_al_NGeo_2014_Final_prepub.pdf Rye, CD, Naveira Garabato, AC, Holland, PR, Meredith, MP, George Nurser, AJ, Hughes, C orcid:0000-0002-9355-0233 , Coward, AC and Webb, DJ (2014) Rapid sea-level rise along the Antarctic margins in response to increased glacial discharge. Nature Geoscience, 7 (10). 732 - 735. |
op_doi |
https://doi.org/10.1038/NGEO2230 |
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Nature Geoscience |
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10 |
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1766100611521052672 |