Climatic Features of Boundary Belt for East Asian Summer Monsoon

Using the NCEP/NCAR reanalysis data and observatory station rainfall data in recent 30 years,the climatic features of boundary belt for east Asian summer monsoon and its relation with rainfall of North China and Northwest China are discussed based on rainfall,humidity,wind field,moisture transport,etc.Results show that the boundary belt roughly southwest-northeastly locates along the upper- and middle- reaches of the Yellow River,north part of North China and Northeast China.The summer rainfall along the belt has comparatively large interannual change and the rainfall amount positively correlates with the intensity of summer monsoon.More summer rainfall occurs over Northwest China(north part of North China) when summer monsoon reaches the Northwest China(north part of North China),and vice versa.