两类厄尔尼诺事件对次年山东夏季降水的影响研究OACSTPCD

The El Niño events can be classified into EP El Niño and CP El Niño according thelocation of the warmest SST anomaly(SSTA).Based on the composite analysis,this paper analyzes the differences of summer rainfall in Shandong Province and related possible mechanisms during the decaying stage of two types of El Niño events.The results can be concluded as follows:In the following summer of CP El Niño,the anomalous Northwest Pacific Anticyclone(NWPAC)shifts northward to increasing the sum-mer rainfall in Shandong through intensifying the water vapor transport of East Asian summer mon-soon.The precipitation is most significant in August,which is related to the intraseasonal northward movement of the NWPAC.In contrast,during the following summer of EP El Niño,NWPAC shifts southward,generating a negative East Asia-Pacific teleconnection pattern with a cyclonic anomaly over Japan.This strengthen the East Asian trough,leading to more droughts in Shandong,especially during June.These results can promote the skill of seasonal prediction on summer precipitation in Shandong.