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1 Ocean Atmospheric Interaction in The Subtropical North Pacific and Its Effect On Climate Variation Prof Liu Qinyu Physical Oceanography Lab Ocean Atmosphere Interaction and Climate Lab Ocean University of Qingdao 5 Yu Shan Road Qingdao 266003 China Email liuqy ouqd edu cn The atmospheric forcing to the ocean is the main external forcing to the low frequency variability of the Subtropical North Pacific The forcing is in the form of air sea boundary fluxes i e momentum flux and buoyancy flux Clear understanding of physical processes of the subtropical Pacific air sea interaction and quantitatively description of the processes are premise and basis for the study of the subtropical gyre In the Subtropical North Pacific the timescale of the atmospheric variability is short however the spatial variability of SST is large This means rapid change atmosphere above very non uniform SST such as the Kuroshio and subtropical fronts Hence the air sea interaction in the subtropical ocean is different from that in the tropical Though the possibility of the existence of air sea interaction in the mid latitude was suggested long time ago Namias1974 the relatively small evaporation large mixed layer depth and large Coriolis effect in the extra tropics and ITCZ in the North Pacific result in different character of wind evaporation SST feedback in the subtropical and tropical North Pacific Ocean Bjerknes 1962 suggested that the air sea interaction in the mid latitude is single direction i e the atmosphere forcing the ocean and no strong feedback of SST anomaly on the atmosphere The issue on the air sea interaction in the mid latitude has been disputed For a long time the progresses on studying the subtropical air sea interaction were very slowly The subject has gained attention again since the Pacific Decadal Oscillation PDO was found and the northern part of subtropical gyre 40 N 170 W is one of the PDO centers Recently we revealed that the air sea interaction by windevaporation SST



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