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《Periodical of Ocean University of China》 2009-05
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The Leading Mode of the Tropical Ocean-Atmosphere Coupling

LIU Qin-Yu,FAN Lei(Physical Oceanography Laboratory,Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China,Qingdao 266100,China)  
The leading mode of the ocean-atmosphere coupling which presents the dominate signal of the ocean-atmosphere interaction in global tropical oceans is indentified in this paper based on the NCEP reanalyzed monthly SST and atmosphere data from January 1948 to December 2005.The variation of the leading mode is consistent with the El Nino-Southern Oscillation(ENSO) mode,and corresponding physical process are revealed.In autumn,divergence of zonal winds and convergence of meridional winds at 850 hPa above Indonesia induce positive SST anomalies in the middle and east Tropical Pacific and a dipole mode with warm in the west and cold in the east in Tropical Indian Ocean.In winter,Tropical Pacific show a typical coupled ocean-atmosphere mode associated with ENSO;a anticyclone situates in the low level of west Pacific and South China Sea;Tropical Indian ocean presents a basin mode,but the SST anomaly in Atlantic is inconspicuous;The SST anomalies in winter in Tropical Pacific and Indian Ocean can lead to westerly anomalies in middle equatorial Pacific in following spring and reduce winter wind in South China Sea,besides,robust low level anticyclone and equatorial easterly anomalies appears in northwest Pacific,and southwest anomalies appears in northwest Atlantic.The influences to the following summer atmosphere circulation in the Leading mode mainly include the impact of Tropical Indian Ocean basin mode on the East Asia monsoon.
【Fund】: 国家自然科学基金项目(4067601040830106)资助
【CateGory Index】: P732
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