ENSO与北半球冬季大气环流异常的年代际关系

Interdecadal Variation of Relationship between ENSO and Northern Winter Atmospheric Circulation Anomalies

利用NCEP/NCAR再分析资料和CPC(气候预测中心)Nino3-4区海表温度序列,研究了1950/1951—2002/2003年冬季ENSO事件与北半球大气环流的相互关系及其年代际变化。结果表明:北半球大气环流对ENSO事件的响应在1978/1979年有一个明显的跃变。跃变后,低纬中高层大气环流对ENSO事件的响应明显减弱,其中东南亚的减弱最为明显,而低层大气环流对ENSO事件的响应则有所增强;东半球中高纬大气环流异常与ENSO事件关系明显减弱;西半球中高纬大气环流与ENSO事件的关系加强。

Using the NCEP/NCAR reanalysis data and the CPC （ Clinate Prediction Center） SST data of the Nino3-4 region in 1950-2003, the relation and its interdecadal variation of the ENSO and the Northern Hemispheric atmospheric circulation in winter are studied. Results show ： 1 ） the response of the Northern Hemispheric atmospheric circulation to ENSO abruptly changed in the winter of 1978/1979; 2） after the abrupt change, the association between ENSO and the middle-upper level atmospheric circulation over the low latitudes has been weakened, especially over the Southeast Asia, while that with the lower-level circulation enhanced ;3 ）the atmospheric circulation in the Eastern Hemisphere has been less affected by ENSO than before, while that in the Western Hemisphere more intensively affected.