Relationship of Pacific SSTA to Summer Extreme Precipitation Events over Eastern China

In the context of 1955-2004 daily precipitation data from 233 stations in Eastern China in conjunction with NCEP/NCAR reanalysis of height, wind, specific humidity and surface pressure fields as well as NOAA SST measurements, a study is performed, using SVD and composite analysis methods, of interrelation between winter Pacific SSTA and summer extreme rainfalls over eastern China. Evidence suggests that the correlation is more appreciable between previous winter Pacific SSTA and the summer extremes in eastern China; the winter equatorial middle-eastern Pacific SSTA is the key factor relating to the summer extreme precipitation of northern China; if the SSTA there occurs in winter, then the western Pacific subtropical high will exhibit anomaly under the effect of PNA (anti-PNA) and later of WP (anti-WP) of atmospheric circulations from winter to summer, thereby further causing anomaly of the northern China summer extreme events; the previous (winter) tropical western Pacific regime as a key factor influences the summer extremes over NE China and the Jiangnan zone. If SSTA happens there in the winter, then there is an anomalous meridional vertical circulation averaged over 105-135⁰E from winter to summer, producing anomaly in vertical motion in summer over the two parts of China, thus responsible for the anomalous summer precipitation extremes there.