The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream
An atmospheric general circulation model with prescribed sea-ice and sea-surface temperatures is used to examine the sensitivity of the atmospheric circulation to changes in sea-ice extent in the Southern Hemisphere. Experiments are conducted where the sea-ice edge is expanded or contracted by 7 deg...
Published in: | Geophysical Research Letters |
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Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/85406/ https://doi.org/10.1029/2011GL048056 |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:85406 2023-05-15T14:02:10+02:00 The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream Kidston, J. Taschetto, A. S. Thompson, D. W. J. England, M. H. 2011-08 https://ueaeprints.uea.ac.uk/id/eprint/85406/ https://doi.org/10.1029/2011GL048056 unknown Kidston, J., Taschetto, A. S., Thompson, D. W. J. and England, M. H. (2011) The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream. Geophysical Research Letters, 38 (15). ISSN 0094-8276 doi:10.1029/2011GL048056 Article PeerReviewed 2011 ftuniveastangl https://doi.org/10.1029/2011GL048056 2023-01-30T21:57:11Z An atmospheric general circulation model with prescribed sea-ice and sea-surface temperatures is used to examine the sensitivity of the atmospheric circulation to changes in sea-ice extent in the Southern Hemisphere. Experiments are conducted where the sea-ice edge is expanded or contracted by 7 degrees of latitude compared with its position in a control run. The experiments suggest that the latitude of the sea-ice edge influences the latitude of the Southern Hemisphere mid-latitude jet stream, but that the amplitude of the atmospheric response depends critically on the location and seasonality of the sea-ice anomalies. During the cold season, the mid-latitude jet shifts significantly poleward when the sea-ice extent is increased, but exhibits very little response when the sea-ice extent is decreased. During the warm season, the jet does not shift significantly regardless of whether the sea-ice edge is extended or contracted. The cause of the asymmetry in the atmospheric response relates to the extent to which the sea-ice anomalies affect meridional temperature gradients in the near-surface baroclinic zone. The results suggest that 1) any future decreases in Antarctic sea-ice are unlikely to have a profound effect on the Southern Hemisphere mid-latitude circulation; and 2) the usefulness of sea-ice variability for seasonal prediction is limited to the cold season and to the case of increases in sea-ice extent. Article in Journal/Newspaper Antarc* Antarctic Sea ice University of East Anglia: UEA Digital Repository Antarctic Geophysical Research Letters 38 15 |
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University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
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description |
An atmospheric general circulation model with prescribed sea-ice and sea-surface temperatures is used to examine the sensitivity of the atmospheric circulation to changes in sea-ice extent in the Southern Hemisphere. Experiments are conducted where the sea-ice edge is expanded or contracted by 7 degrees of latitude compared with its position in a control run. The experiments suggest that the latitude of the sea-ice edge influences the latitude of the Southern Hemisphere mid-latitude jet stream, but that the amplitude of the atmospheric response depends critically on the location and seasonality of the sea-ice anomalies. During the cold season, the mid-latitude jet shifts significantly poleward when the sea-ice extent is increased, but exhibits very little response when the sea-ice extent is decreased. During the warm season, the jet does not shift significantly regardless of whether the sea-ice edge is extended or contracted. The cause of the asymmetry in the atmospheric response relates to the extent to which the sea-ice anomalies affect meridional temperature gradients in the near-surface baroclinic zone. The results suggest that 1) any future decreases in Antarctic sea-ice are unlikely to have a profound effect on the Southern Hemisphere mid-latitude circulation; and 2) the usefulness of sea-ice variability for seasonal prediction is limited to the cold season and to the case of increases in sea-ice extent. |
format |
Article in Journal/Newspaper |
author |
Kidston, J. Taschetto, A. S. Thompson, D. W. J. England, M. H. |
spellingShingle |
Kidston, J. Taschetto, A. S. Thompson, D. W. J. England, M. H. The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream |
author_facet |
Kidston, J. Taschetto, A. S. Thompson, D. W. J. England, M. H. |
author_sort |
Kidston, J. |
title |
The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream |
title_short |
The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream |
title_full |
The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream |
title_fullStr |
The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream |
title_full_unstemmed |
The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream |
title_sort |
influence of southern hemisphere sea-ice extent on the latitude of the mid-latitude jet stream |
publishDate |
2011 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/85406/ https://doi.org/10.1029/2011GL048056 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
Kidston, J., Taschetto, A. S., Thompson, D. W. J. and England, M. H. (2011) The influence of Southern Hemisphere sea-ice extent on the latitude of the mid-latitude jet stream. Geophysical Research Letters, 38 (15). ISSN 0094-8276 doi:10.1029/2011GL048056 |
op_doi |
https://doi.org/10.1029/2011GL048056 |
container_title |
Geophysical Research Letters |
container_volume |
38 |
container_issue |
15 |
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1766272265273475072 |