January 1999 Indian Ocean cooling event

Details January 1999 Indian Ocean cooling event January 1999 Indian Ocean cooling event

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3717h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 19, p. 3717-3720

Physics

37

Atmospheric Composition And Structure: Air/Sea Constituent Fluxes, Meteorology And Atmospheric Dynamics: Convective Processes, Oceanography: General: Climate And Interannual Variability, Oceanography: Physical: Air/Sea Interactions

Scientific paper

Unexpectedly strong sub-seasonal SST variability over the tropical Indian Ocean has been observed by the TRMM microwave imager, which provides unprecedented tropical SST information in the presence of clouds. In January-February 1999 SST averaged over an area 20° longitude by 10° latitude cooled by ~1.5°C over 10 days and warmed by ~1.25°C in the following week. Local changes were up to +/-3°C. There were strong variations in atmospheric convection and surface wind stress associated with the SST variability. The evolution of the convection suggests a feedback from the SST changes into atmospheric convection. Net air-sea heat-flux cannot account for the observed cooling; oceanic processes are fundamental to this event. The roles of such sub-seasonal ocean-atmosphere interactions in the evolution of the Madden-Julian Oscillation, the seasonal and the interannual variability of Indian Ocean SST deserve further investigation.

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