北太平洋海温异常与东亚夏季风相互作用的年代际变化

THE DECADAL CHANGE OF THE INTERACTION BETWEEN NORTHERN PACIFIC SSTA AND EAST ASIAN SUMMER MONSOON

主要利用英国气象局提供的海温资料和ＮＣＡＲ／ＮＣＥＰ提供的４０年高度场及风场资料分析了东亚夏季风与北太平洋ＳＳＴＡ的关系，指出两者之间相互作用存在着年代际变化特征，７０年代中期以前，北太平洋海温异常通过一大国波列作用于东亚夏季风，造成我国华北地区夏季降水偏多。７６年以后，北太平洋海温异常使大圆波列减弱，与东亚夏季风关系淡漠，不再影响华北降水。由此指出：影响东亚天气气候的海温关键区，并不总固定在某一海区，随着海气作用的年代际变化关键区是会发生转移的。

This paper analyze mainly the relation between northern pacific SSTA and east Asian summer monsoon, it is pointed that their interaction has feature of change decadely. Before 1976 the northern Pacific SST anomalies act on the east Asian summer monsoon by a great circle wavetrain, which causes northern-China precipitation abundance. After 1976 the northern Pacific SST animalies make tile wavetrain weak, relation to East Asian summer monsoon will be weak. It shows that the key region that affect east Asian summer monsoon is not changeless, it will divert from one area to another.