Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3517602t&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 17, CiteID L17602
Physics
7
Oceanography: Physical: Decadal Ocean Variability (1616, 1635, 3305, 4215), Oceanography: Physical: General Circulation (1218, 1222), Oceanography: General: Upwelling And Convergences (4964), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: Physical: Upper Ocean And Mixed Layer Processes
Scientific paper
The vertical structure of temperature change in the Indian Ocean (IO) during 1961-2000 indicates that a region of tropical thermocline cooling accompanies the upper level warming. Results from data analysis and ocean general circulation model experiments suggest that the cooling signals exceed the cross-data and cross-model differences. Spatial patterns of the temperature trend above 200 m resemble the negative IO dipole structure, with the strongest cooling occurring in the western-central basin south of the equator. The upper thermocline cooling is mainly caused by enhanced Ekman pumping velocity, which shoals the thermocline. The enhanced upwelling is consistent with the strengthened Southern subtropical cell. Enhanced equatorial westerly winds contribute to the negative dipole pattern. Remote forcing from the Pacific may contribute to the cooling below 200 m and further south.
Han Weiqing
Trenary Laurie L.
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