第一部分（Ｚｈａｎｇ ｅｔ ａｌ，２００１）的资料分析表明，Ｅｌ Ｎｉｏ事件发生之前在赤道中东太平洋存在着显著的异常经向风应力辐合、为了分析这种超前的辐合经向风应力距平在其后的ＥｌＮｉｏ事件发生中的动力作用，本文利用简单热带海洋动力学模式，从动力学上研究了热带海洋对关于赤道辐合的理想经向风应力强迫的响应，指出赤道东太平洋出现在Ｅｌ Ｎｉｏ事件之前的辐合经向风应力异常有利于Ｅｌ　Ｎｉｏ事件的发生。辐合的经向风应力强迫作用于热带海洋，会激发出西传的Ｒｏｓｓｂｙ波，使得赤道附近的海洋混合层变厚。由于耗散的影响，最大的增厚区位于强迫区域。当这个强迫作用于赤道东太平洋时，这将有利于以 Ｎｌ　Ｎｉｏ事件发生；另一方面，Ｒｏｓｓｂｙ波响应在赤道及其附近使得表层海水向西流动，中东太平洋表层水的不断向西输送有利于表层水在西太平洋堆积，为后来暖事件的发生累积能量。 The data analysis of the first part (Zhang et al., 2001) shows that there was a significant anomaly wind stress convergence in the equatorial central and eastern Pacific before the El Nio event. In order to analyze this advanced convergence wind stress interval In this paper, based on the simple model of tropical ocean dynamics, the response of the tropical ocean to the ideal meridional wind stress of the equatorial convergence is studied dynamically. It is pointed out that the equatorial east The occurrence of El Nio events is favored by the convergence of the meridional wind stress anomalies occurring in the Pacific before the El Nio event. The convergent meridional wind stress forces the tropical oceans to excite a Western Rossby wave that thickens the marine mixed layer near the equator. Due to dissipative effects, the largest thickened area is in the forcing area. On the other hand, the Rossby wave responds to the fact that the surface seawater flows westwards at and near the equator, and the surface water in the Middle East and Pacific continues to flow westwards Is conducive to surface water accumulation in the western Pacific, for the subsequent occurrence of warm events accumulated energy.