摘要
利用１９８０～１９８８年９年的观测资料，分析了夏季东北亚阻塞高压的年际变化及其与江淮地区夏季降水之间的关系，指出夏季东北亚阻塞高压具有十分明显的年际变化，同时它与江淮地区夏季降水之间存在着较密切的关系：当夏季东北亚阻塞高压频发时，江淮地区降水偏多；而当夏季东北亚阻塞高压维持日数少时，江淮地区降水偏少。为考察产生上述结果的原因，我们分析了全球海温异常，并利用合成的热带西太平洋海温异常模拟研究了热带西太平洋海温异常对东北亚阻塞高压形成和维持的影响。最后指出热带西太平洋海温异常引起的东亚－太平洋型遥相关波列是产生夏季东北亚阻塞高压的年际变化及其与江淮地区夏季降水之间关系的一个重要原因。
By the 1980～1988 ECWMF data, the interannual variations of the blocking highs over the northeastern Asia in summer and their relation to the precipitations over the Yangtze River and Huaihe River basin in summer are analysed The results show that the blocking highs over the northeastern Asia in summer have obviously interannual variations The results also show that there is a close relation between blocking highs over the northeastern Asia and the precipitations over the Yangtze River and Huaihe River basin: when blocking highs occur frequently over the northeastern Asia in summer, the precipitations over the Yangtze River and Huaihe River basin are more than normal; when blocking highs occur seldom, the precipitations are less than normal To investigate the causes of the above noted results, we analysed the sea surface temperature (SST) anomalies, and simulated the influence of the SST anomalies in the tropical western Pacific on the blocking highs over the northeastern Asia, using the composite SST anomalies Results show that the East Asia/Pacific teleconnection pattern caused by the SST anomalies in the tropical western Pacific is one of the important causes of producing the interannual variations of the blocking highs over the northeastern Asia in summer and their relation to the summer precipitations over the Yangtze River and Huaihe River basin
出处
《大气科学》
CSCD
北大核心
1998年第5期727-734,共8页
Chinese Journal of Atmospheric Sciences
关键词
东亚-太平洋
遥相关型
东北亚阻塞高压
年变化
East Asia/Pacific teleconnection pattern blocking highs over the northeastern Asia sea surface temperature anomalies
