Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3314704s&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 14, CiteID L14704
Physics
19
Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Remote Sensing, Atmospheric Processes: Tropical Meteorology, Oceanography: Physical: Upper Ocean And Mixed Layer Processes
Scientific paper
Intense intraseasonal cooling events in the tropical south Indian Ocean are examined using eight years of TRMM observations. These events occur almost every year during austral summer when the intertropical convergence zone is displaced south of the equator and roughly collocated with a thermocline ridge. Composite maps of SST, OLR and surface winds, based on eleven cooling events with SST exceeding 1°C, suggest that reduced solar radiation, enhanced evaporation and possibly strong entrainment over the thermocline ridge all play a role in the SST cooling. OLR and covariability in SST exhibit latitudinal variations in spectrum. A distinct southern mode around 10°S-5°S exhibits a peak in coherence-squared at a period of 65 days. In contrast, an equatorially symmetric mode has a coherence-squared peak at 35 days. This may hint at a possible feedback onto the atmosphere from strong intraseasonal SST variability over the south Indian Ocean.
Saji N. H.
Tam Chi-Yung
Xie Shang-Ping
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