Antarctic sea ice variability and trends, 1979–2010
In sharp contrast to the decreasing sea ice coverage of the Arctic, in the Antarctic the sea ice cover has, on average, expanded since the late 1970s. More specifically, satellite passive-microwave data for the period November 1978–December 2010 reveal an overall positive trend in ice extents of 17...
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Online Access: | https://doi.org/10.5194/tc-6-871-2012 http://www.the-cryosphere.net/6/871/2012/tc-6-871-2012.pdf https://doaj.org/article/3339008c6bdb4a89bf12718372401662 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:3339008c6bdb4a89bf12718372401662 2023-05-15T13:55:12+02:00 Antarctic sea ice variability and trends, 1979–2010 D. J. Cavalieri C. L. Parkinson 2012-08-01 https://doi.org/10.5194/tc-6-871-2012 http://www.the-cryosphere.net/6/871/2012/tc-6-871-2012.pdf https://doaj.org/article/3339008c6bdb4a89bf12718372401662 en eng Copernicus Publications doi:10.5194/tc-6-871-2012 1994-0416 1994-0424 http://www.the-cryosphere.net/6/871/2012/tc-6-871-2012.pdf https://doaj.org/article/3339008c6bdb4a89bf12718372401662 undefined The Cryosphere, Vol 6, Iss 4, Pp 871-880 (2012) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2012 fttriple https://doi.org/10.5194/tc-6-871-2012 2023-01-22T17:32:56Z In sharp contrast to the decreasing sea ice coverage of the Arctic, in the Antarctic the sea ice cover has, on average, expanded since the late 1970s. More specifically, satellite passive-microwave data for the period November 1978–December 2010 reveal an overall positive trend in ice extents of 17 100 ± 2300 km2 yr−1. Much of the increase, at 13 700 ± 1500 km2 yr−1, has occurred in the region of the Ross Sea, with lesser contributions from the Weddell Sea and Indian Ocean. One region, that of the Bellingshausen/Amundsen Seas, has (like the Arctic) instead experienced significant sea ice decreases, with an overall ice extent trend of −8200 ± 1200 km2 yr−1. When examined through the annual cycle over the 32-yr period 1979–2010, the Southern Hemisphere sea ice cover as a whole experienced positive ice extent trends in every month, ranging in magnitude from a low of 9100 ± 6300 km2 yr−1 in February to a high of 24 700 ± 10 000 km2 yr−1 in May. The Ross Sea and Indian Ocean also had positive trends in each month, while the Bellingshausen/Amundsen Seas had negative trends in each month, and the Weddell Sea and western Pacific Ocean had a mixture of positive and negative trends. Comparing ice-area results to ice-extent results, in each case the ice-area trend has the same sign as the ice-extent trend, but the magnitudes of the two trends differ, and in some cases these differences allow inferences about the corresponding changes in sea ice concentrations. The strong pattern of decreasing ice coverage in the Bellingshausen/Amundsen Seas region and increasing ice coverage in the Ross Sea region is suggestive of changes in atmospheric circulation. This is a key topic for future research. Article in Journal/Newspaper Antarc* Antarctic Arctic Ross Sea Sea ice The Cryosphere Weddell Sea Unknown Antarctic Arctic Indian Pacific Ross Sea The Antarctic Weddell Weddell Sea The Cryosphere 6 4 871 880 |
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envir geo D. J. Cavalieri C. L. Parkinson Antarctic sea ice variability and trends, 1979–2010 |
topic_facet |
envir geo |
description |
In sharp contrast to the decreasing sea ice coverage of the Arctic, in the Antarctic the sea ice cover has, on average, expanded since the late 1970s. More specifically, satellite passive-microwave data for the period November 1978–December 2010 reveal an overall positive trend in ice extents of 17 100 ± 2300 km2 yr−1. Much of the increase, at 13 700 ± 1500 km2 yr−1, has occurred in the region of the Ross Sea, with lesser contributions from the Weddell Sea and Indian Ocean. One region, that of the Bellingshausen/Amundsen Seas, has (like the Arctic) instead experienced significant sea ice decreases, with an overall ice extent trend of −8200 ± 1200 km2 yr−1. When examined through the annual cycle over the 32-yr period 1979–2010, the Southern Hemisphere sea ice cover as a whole experienced positive ice extent trends in every month, ranging in magnitude from a low of 9100 ± 6300 km2 yr−1 in February to a high of 24 700 ± 10 000 km2 yr−1 in May. The Ross Sea and Indian Ocean also had positive trends in each month, while the Bellingshausen/Amundsen Seas had negative trends in each month, and the Weddell Sea and western Pacific Ocean had a mixture of positive and negative trends. Comparing ice-area results to ice-extent results, in each case the ice-area trend has the same sign as the ice-extent trend, but the magnitudes of the two trends differ, and in some cases these differences allow inferences about the corresponding changes in sea ice concentrations. The strong pattern of decreasing ice coverage in the Bellingshausen/Amundsen Seas region and increasing ice coverage in the Ross Sea region is suggestive of changes in atmospheric circulation. This is a key topic for future research. |
format |
Article in Journal/Newspaper |
author |
D. J. Cavalieri C. L. Parkinson |
author_facet |
D. J. Cavalieri C. L. Parkinson |
author_sort |
D. J. Cavalieri |
title |
Antarctic sea ice variability and trends, 1979–2010 |
title_short |
Antarctic sea ice variability and trends, 1979–2010 |
title_full |
Antarctic sea ice variability and trends, 1979–2010 |
title_fullStr |
Antarctic sea ice variability and trends, 1979–2010 |
title_full_unstemmed |
Antarctic sea ice variability and trends, 1979–2010 |
title_sort |
antarctic sea ice variability and trends, 1979–2010 |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/tc-6-871-2012 http://www.the-cryosphere.net/6/871/2012/tc-6-871-2012.pdf https://doaj.org/article/3339008c6bdb4a89bf12718372401662 |
geographic |
Antarctic Arctic Indian Pacific Ross Sea The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Arctic Indian Pacific Ross Sea The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Arctic Ross Sea Sea ice The Cryosphere Weddell Sea |
genre_facet |
Antarc* Antarctic Arctic Ross Sea Sea ice The Cryosphere Weddell Sea |
op_source |
The Cryosphere, Vol 6, Iss 4, Pp 871-880 (2012) |
op_relation |
doi:10.5194/tc-6-871-2012 1994-0416 1994-0424 http://www.the-cryosphere.net/6/871/2012/tc-6-871-2012.pdf https://doaj.org/article/3339008c6bdb4a89bf12718372401662 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-6-871-2012 |
container_title |
The Cryosphere |
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6 |
container_issue |
4 |
container_start_page |
871 |
op_container_end_page |
880 |
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