Winter Asia Jetstream and Seasonal Precipitation in East China

The monthly mean geostrophic wind fields for January during 1951-1990 period are calculated by using data of 500 hPa monthly mean height. The relation between Asia Jetstream in winter and the important seasonal precipitation in East China is analysed. The analysis shows that the south branch of jetstream is stronger (weaker) in winter, the rainfall will be more (less) than normal in the subsequent spring in South China, and summer rainfall in North China will be more (less), too; these important rainy seasons are related to each other; the Indian summer monsoon is not only related to the summer rainfall in North China, but also related to the spring rainfall in South China and the south branch of jetstream in winter.