THE CORRELATIONS BETWEEN SST AND SUMMER PRECIPITATION OVER EASTERN CHINA AND THE EFFECT OF THE SST ANOMALY IN THE SOUTH CHINA SEA ON THE SUMMER MONSOON AND PRECIPITATION

By use of the method of empirical orthogonal function resolution a study is made of the distribution patterns of summer rainfall percentage anomalies over eastern China with the result that such anomalies are able to reflect the relative amount of local precipitation.Then the correlations are obtained through calculation between the patterns and the January and June global SST,indicating key regions in association with China's summer rainfall.On this basis,an 11-layer atmospheric circulation model by the U.K.Meteorological Office is used to simulate the effect of a weak SST anomaly of the South China Sea upon the summer monsoon circulation in China's mainland.Results show that ‘attraction' is available for the Indian monsoon with a warm anomaly of the SST and ‘repelling' with a cold,representing one of the reasons for the antiphase between the monsoons over the South China Sea and India.Such functions of SST anomalies have a significant influence on summer rainfall over eastern China.