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Antarctic Peninsula mesoscale cyclone variability and climatic impacts influenced by the SAM
Author(s) -
Lubin Dan,
Wittenmyer Robert A.,
Bromwich David H.,
Marshall Gareth J.
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl032170
Subject(s) - westerlies , mesoscale meteorology , peninsula , climatology , cyclone (programming language) , geology , circumpolar star , southern hemisphere , storm , extratropical cyclone , oceanography , geography , archaeology , field programmable gate array , computer science , computer hardware
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.