Antarctic Peninsula mesoscale cyclone variability and climatic impacts influenced by the SAM

The frequency of mesoscale cyclones in the Western Antarctic Peninsula (WAP) region during 1991-94 is correlated with the Southern Hemisphere Annular Mode (SAM) index, most strongly during winter and spring. Also, during periods of positive SAM index polarity there is a shift in the storm tracks to...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Lubin, Dan, Wittenmyer, Robert A., Bromwich, David H., Marshall, Gareth J.
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2008
Subjects:
Meteorology and Climatology
Atmospheric Sciences
Antarctic
Antarctic Peninsula
Antarc*
Online Access:http://nora.nerc.ac.uk/id/eprint/11554/
https://nora.nerc.ac.uk/id/eprint/11554/1/2007GL032170.pdf
http://www.agu.org/journals/gl/gl0802/2007GL032170/2007GL032170.pdf
Description
Summary:The frequency of mesoscale cyclones in the Western Antarctic Peninsula (WAP) region during 1991-94 is correlated with the Southern Hemisphere Annular Mode (SAM) index, most strongly during winter and spring. Also, during periods of positive SAM index polarity there is a shift in the storm tracks to favor more east-bound trajectories, consistent with strengthening of circumpolar westerlies. The presence of mesoscale cyclones is associated with positive near-surface-air temperature anomalies in the WAP region year-round, largest during winter.

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