PRELIMINARY EXPERIMENTS FOR REGIONAL ATMOSPHERIC CIRCULATION’S RESPONSE TO SST ANOMALIES IN SOUTH CHINA SEA AND ITS ADJACENT AREAS

The IAP AGCM was applied to study the climatic significance of the anomalous sea surface temperature (SST) in the South China Sea (SCS) and its adjacent areas. Numerical experiments indicated that the East Asian atmospheric circulation to the SST anomalies is time dependent and of seasonality, as well as with a reasonable spatial structure. When there are cold SST anomalies in the SCS and the Bay of Bengal and warm anomalies in the western tropical Pacific Ocean, there is anomalous northeasterly over the SCS in February and March. Moreover, there is anomalous anti cycloniccirculation (AAC) generated over Philippine in summer. The AAC's low frequency variability results in a coherent low frequency activity in the East Asian atmospheric circulation by the way of teleconnection. Accompanying with AAC, the western Pacific subtropical high in summer becomes weak and also shifts eastward than normal, which causes anomalies in the meridional transport of water vapor.