Relations of water vapor transport from Indian monsoon with that over EastAsia and the summer rainfall in China

A diagnostic study is made to investigate the relationship between water va por transport from Indian monsoon and that over East Asia in Northern summe r. It is found that water vapor transport from Indian monsoon is inverse to that over East Asia. More (less) Indian monsoon water vapor transport corr esponds to less (more) water vapor transport over East Asia and less (more) rainfall in the middle and lower reaches of the Yangtze River valley. The Indian summer monsoon water vapor transport is closely related to the inten sity of the western Pacific subtropical high in its southwestern part. The stronger (weaker) the Indian summer monsoon water vapor transport, the weak er (stronger) the western Pacific subtropical high in its southwestern part , which leads to less (more) water vapor transport to East Asia, and thus l ess (more) rainfall in the middle and lower reaches of the Yangtze River va lley. Analysis of the out-going longwave radiation anomalies suggests that the convective heating anomalies over the Indian Ocean may have significant impact not only on the Indian monsoon, but also on the East Asian monsoon.