Mountain torques and atmospheric oscillations

Details Mountain torques and atmospheric oscillations Mountain torques and atmospheric oscillations

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1207l&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 7, p. 1207-1210

Physics

12

Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions, Meteorology And Atmospheric Dynamics, Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions

Scientific paper

Theoretical work and general circulation model (GCM) experiments suggest that the midlatitude jet stream's interaction with large-scale topography can drive intraseasonal oscillations in large-scale atmospheric circulation patterns. In support of this theory, we present new observational evidence that mountain-induced torques play a key role in 15-30-day oscillations of the Northern Hemisphere circulation's dominant patterns. The affected patterns include the Arctic Oscillation (AO) and the Pacific-North-American (PNA) pattern. Positive torques both accelerate and anticipate the midlatitude westerly winds at these periodicities. Moreover, torque anomalies anticipate the onsets of weather regimes over the Pacific, as well as the break-ups of hemispheric-scale regimes.

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