赤道太平洋次表层海水温度异常的信号通道

应用热带太平洋上层XBT温度资料,分析探讨了西太平洋暖池区次表层海温冷暖异常信号的变化规律,揭示了影响西太平洋暖池区次表层海温冷变异常的信号通道。分析表明,西太平洋暖池区的次表层海温异常变冷与太平洋北赤道流的海温冷异常信号西传有重要关系。北赤道流的海温异常冷(暖)信号是沿温跃层由赤道中东太平洋潜沉向西太平洋暖池区传播,与西太平洋次表层海温异常(冷)暖信号向赤道中东太平洋传播构成了热带海洋信号的气旋式"环流通道"。在这一"环流通道"中,北赤道流的海温异常信号西传是导致西太平洋暖池区及西太平洋次表层海温异常的重要机制,是影响厄尔尼诺(ElNino)和拉尼娜(LaNina)事件发生的关键。

Oceanic temperature anomalous signal pathway in the equatorial Pacific

Based on oceanic temperature data of 1955-2001 in the tropical Pacific,the changes of the west Pacific warm pool oceanic temperature anomalous signal pathway are analyzed and discussed in the paper.The pathway that influences anomalous signal of sub surface oceanic temperature in the west Pacific warm pool region is revealed.The analysis indicates that there is close relation between change of sub surface posit ive and negative oceanic temperature anomalous signal in the west Pacific warm pool region and the anomalous signal westward propagation in the north equatorial current.The signal in the north equator current propagated from the equator middle east Pacific toward the west Pacific warm pool region along the ther mocline,the cool and warm signal in the west Pacific propagated toward the equator middle east Pacific along the thermocline, and they have formed cyclone circulat ion pathway of tropical oceanic anomalous signal on thermocline curved surface.The westward propagation of the sub surface oceanic temperature anomalous signal in the north equatorial current is the important mechanism to lead to the warm pool region and the west Pacific and is a key factor influencing the El N ino and La Nina events.