Winter Circulation Condition of the Tropical Western Pacific and Subsequent Asian Summer Monsoon
冬季赤道西太平洋环流状况与后期亚洲季风

Using monthly mean NCEP reanalysis data and monthly rainfall data of 36 stations in China, by means of composite correlation and statistical significant test, the relationship between winter circulation conditions over the tropical western Pacific and Asian monsoon circulation variations (in- cluding South and East Asia) of the following spring and summer is explored. The results clearly indi- cate that winter circulation condition over the tropical western Pacific predominantly influences the subsequent South and East Asia Monsoon circulations and summer rainfall in China. Having positive SLP anomalies over the tropical western Pacific, corresponding to anticyclone (cyclone) circulation anomalies, results in weaker (stronger) monsoon circulations over South and East Asia and more (less) summer rainfall in the Yangtze River Valley. The research reveals the general feature of the lag influ- ences