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The effect of Antarctic sea ice on the Southern Hemisphere atmosphere during the southern summer

Citation

Raphael, MN and Hobbs, WR and Walner, L, The effect of Antarctic sea ice on the Southern Hemisphere atmosphere during the southern summer, Climate Dynamics: Observational, Theoretical and Computational Research on The Climate System, 36, (37-38) pp. 1403-1417. ISSN 0930-7575 (2011) [Refereed Article]


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Copyright 2009 The Author

DOI: doi:10.1007/s00382-010-0892-1

Abstract

This study examines the influence of Antarctic sea ice distribution on the large scale circulation of the Southern Hemisphere using a fully coupled GCM where the sea ice submodel is replaced by a climatology of observed extremes in sea ice concentration. Three 150-year simulations were completed for maximum, minimum and average sea ice concentrations and the results for the austral summer (January–March) were compared using the surface temperatures forced by the sea ice distributions as a filter for creating the composite differences. The results indicate that in the austral summer the polar cell expands (contracts) under minimum (maximum) sea ice conditions with corresponding shifts in the midlatitude Ferrell cell. We suggest that this response occurs because sea ice lies in the margin between the polar and midlatitude cells. The polarity of the Southern Hemisphere Annular (SAM) mode is also influenced such that when sea ice is at a minimum (maximum) the polarity of the SAM tends to be negative (positive).

Item Details

Item Type:Refereed Article
Keywords:Antarctic sea ice, atmospheric dynamics
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Atmospheric Dynamics
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
Author:Hobbs, WR (Dr Will Hobbs)
ID Code:81123
Year Published:2011
Web of Science® Times Cited:6
Deposited By:IMAS Research and Education Centre
Deposited On:2012-11-22
Last Modified:2017-10-30
Downloads:253 View Download Statistics

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