Relations between Summer Rainfall over the Lower Reach of Yangtze River and East Asian Summer Monsoon as well as Sea Surface Temperature over the Pacific in Spring

Using the NCEP/NCAR reanalysis daily data,NOAA monthly sea surface temperature data and daily rainfall station data,connections between summer rainfall over the lower reach of Yangtze River,East Asian summer monsoon(including South China Sea summer monsoon and subtropical summer monsoon) and sea surface temperature over the Pacific in spring are studied in this paper.The Results show that the positive(negative) correlation exists between summer rainfall over the lower reach of Yangtze River and subtropical summer monsoon(South China Sea summer monsoon).The sea surface temperature over equatorial Pacific in spring may be a prophase signal to predict the following summer rainfall over the lower reach of Yangtze River because high correlation exists between the two elements.In addition,the response of strength for subtropical monsoon to the sea surface temperature over equatorial Pacific in spring.