Impacts of the Thermal State and the Convective Activities in the Tropical Western Warm Pool on the Summer Climate Anomalies in East Asia
热带西太平洋暖池的热状态及其上空的对流活动对东亚夏季气候异常的影响

In this paper, impacts of the thermal state in the western tropical Pacific warm pool and the convective activities over the warm pool on the summer climate anonialies in East Asia ate analysed by using the observed data of the sea temperatare in surface and subsurface of the westem tropical Pacific warm pool, the high cloud amount and precipitation for 1978-1989. The analysed results show that the thermal state in the tropical western Pacific warm pool and the convective activities over the warm pool play an important role in the summer climate anomalies in East Asia. When the western tropical Pacific warm pool is warming, the convective activities are intensified from the area around the Philippines to the Indo-China Peninsula through the South China Sea, the western Pacific subtropical high may shift nortbward, the summer rainfall may be below normal in the Yangtze River valley and the Huaihe River valley. On the Contrary, the convective activities are weak around the Philippines, the western Pacific subtropical high may shift southward, the summer rainfall may be above normal and it may be below normal in the Yellow River valley, drought summer is frequently caused there.The observational facts also show that after the enhancement of the convective activities over the western tropical Pacific warm pool, there is a teleconnection pattern in the circu1ation anomalies over the regions from Southeast Asia to the western Coast of North America through East Asia, i.e., the so-called East Asia / Pacific Pattern.