通过对热带太平洋上层XBT温度资料分析 ,探讨了对厄尔尼诺 (ElNino)事件发生起重要作用的西太平洋暖池区次表层海温变暖异常的变化规律 ,揭示了影响西太平洋暖池区次表层海温变暖异常的形成机制。分析表明 :西太平洋暖池区的次表层海温异常变暖与赤道太平洋的北赤道流 ( 1 0°N)的海温异常存在密切关系。在ElNino事件发生的前期 ,位于赤道中东太平洋的异常暖水沿北赤道流温跃层潜沉向西太平洋暖池区输送 ,在西太平洋暖池堆积并向赤道西太平洋扩展 ,当异常暖水达到一定强度 ,并在大气的强迫下 ,异常暖水沿温跃层东传至赤道中东太平洋并上浮于海面 ,最终导致ElNino事件的爆发。北赤道流的异常海温西传是导致西太平洋暖池区次表层海温异常的重要机制 ,是导致ElNino事件发生的关键 By analyzing the upper XBT temperature data in the tropical Pacific Ocean, we discussed the variation of sub-surface sea temperature warming anomalies in the western Pacific warm pool that play an important role in the El Niño event, The formation mechanism of abnormal warming. The analysis shows that there is a close relationship between the anomalous subsurface temperature anomalies in the western Pacific warm pool and the SST anomalies at the equatorial Pacific equator (1 0 ° N). In the early period of the El Nino event, the anomalous warm water in the equatorial central and eastern Pacific was transported to the western Pacific warm pool area along the equatorial thermocline, and accumulated in the warm pool of the western Pacific and extended to the equatorial western Pacific. When the abnormal warm water reached Under certain intensity and under the action of the atmosphere, abnormal warm water eastward along the thermocline reaches the equatorial central and eastern Pacific and rises above the sea surface, eventually leading to the El Nino outbreak. The abnormal SST anomaly in the northern equatorial stream is an important mechanism leading to the anomalous SST anomalies in the western Pacific warm pool and is the key to the El Nino event