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 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.

Details

Publication status:
Published
Author(s):
Authors: Lubin, Dan, Wittenmyer, Robert A., Bromwich, David H., Marshall, Gareth J.

On this site: Gareth Marshall
Date:
1 January, 2008
Journal/Source:
Geophysical Research Letters / 35
Page(s):
4pp
Digital Object Identifier (DOI):
https://doi.org/10.1029/2007GL032170