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Kidston, J., Taschetto, A. S., Thompson, D. W. J. 
ORCID: https://orcid.org/0000-0002-5413-4376 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
Abstract
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.
| Item Type: | Article |
|---|---|
| Faculty \ School: | Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Climatic Research Unit |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 07 Jun 2022 13:30 |
| Last Modified: | 15 Jun 2023 05:31 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/85406 |
| DOI: | 10.1029/2011GL048056 |
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