厄尔尼诺的发生与赤道西太平洋暖池次表层海温异常

El Nio Occurrence and Sub-Struface Ocean Temperature Anomalies in the Pacific Warm Pool

通过资料分析研究了厄尔尼诺事件的爆发与西太平洋暖池次表层海温正异常的重要关系。结果表明， Ｅｌ Ｎｉ珘ｎｏ 事件之前暖池次表层海温都有明显的持续升高； 这种暖池次表层海温正距平的出现， 尤其是它向赤道中东太平洋的传播对 Ｅｌ Ｎｉ珘ｎｏ 事件的爆发有直接关系，是导致 Ｅｌ Ｎｉ珘ｎｏ 事件的重要原因。分析还表明， 暖池次表层海温正距平的东移原因在于赤道西太平洋地区西风异常的发生和向东扩展。

The close relationship of the El Nio occurrence with the positive anomalies of the sub-surface ocean temperature (SOT) in the Pacific warm pool region is studied through the data analyses. It is shown that there are continued positive anomalies of SOT in the warm pool region prior to the occurrence of El Nio event; The outbreak of El Nio event is directly associated to the eastward propagation of positive anomalies of SOT in the warm pool region and expanding to the sea surface in the equaorial eastern Pacific, so that the positive anomalies of SOT in the warm pool region and its eastward propagation are important factors to cause El Nio event. It is also clear that the reason to cause the eastward propagation of anomalous SOT in the warm pool region is the westerly wind anomalies over the equatorial western Pacific and their eastward expansion.