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GEOPHYSICAL RESEARCH LETTERS,
VOL. 34,
L07709,
doi:10.1029/2007GL029683,
2007
The Atlantic Meridional Mode and hurricane activity
Daniel J. Vimont
Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
James P. Kossin
Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin-Madison, Madison, Wisconsin, USA
Abstract
Connections between the Atlantic Meridional Mode (AMM) and seasonal hurricane activity are investigated. The AMM, a dynamical
“mode” of variability intrinsic to the tropical coupled ocean-atmosphere system, is strongly related to seasonal hurricane
activity on both decadal and interannual time scales. The connection arises due to the AMM's relationship with a number of
local climatic conditions that all cooperate in their influence on hurricane activity. Further analysis indicates that the
Atlantic Multi-decadal Oscillation (AMO) can excite the AMM on decadal time scales. As such, it is suggested that the AMO's
influence on seasonal hurricane activity manifests itself through the AMM. This relationship between the AMM, AMO, and seasonal
hurricane activity refocuses our understanding of how climate variations relate to seasonal hurricane activity in the Atlantic,
and offers an improved framework beyond purely thermodynamic arguments that relates hurricanes to large-scale climate variations.
Received 14
February
2007;
accepted 7
March
2007;
published 11
April
2007.
Keywords: climate variability;
tropical meteorology;
ocean/atmospehre interactions.
Index Terms: 1616 Global Change: Climate variability (1635, 3305, 3309, 4215, 4513); 3374 Atmospheric Processes: Tropical meteorology; 3339 Atmospheric Processes: Ocean/atmosphere interactions (0312, 4504).
Read Full Article (file size: 2409995 bytes) Cited by
Citation: Vimont, D. J., and J. P. Kossin
(2007),
The Atlantic Meridional Mode and hurricane activity,
Geophys. Res. Lett.,
34,
L07709,
doi:10.1029/2007GL029683.
Copyright 2007 by the American Geophysical Union.
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