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. 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

Full text not available from this repository. (Request a copy)

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
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 07 Jun 2022 13:30
Last Modified: 07 Jun 2022 19:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/85406
DOI: 10.1029/2011GL048056

Actions (login required)

View Item View Item