Footprinting: A seasonal connection between the tropics and mid-latitudes

Details Footprinting: A seasonal connection between the tropics and mid-latitudes Footprinting: A seasonal connection between the tropics and mid-latitudes

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3923v&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 20, p. 3923-3926

Physics

64

Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions, Oceanography: General: Climate And Interannual Variability, Oceanography: Physical: El Nino

Scientific paper

A connection between the mid-latitude and tropical Pacific is identified in a coupled general circulation model (CGCM). The connection involves a seasonal coupling between winter mid-latitude atmospheric circulation anomalies, and summer equatorial wind stress anomalies. The seasonal coupling results from a ``footprinting'' mechanism, in which the summer tropical atmosphere responds to subtropical sea surface temperature (SST) anomalies that are generated by the mid-latitude atmospheric variability during the previous winter. Details of the connection, and of the footprinting mechanism are presented. Implications for interannual ENSO and decadal ENSO-like variability are discussed.

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