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利用赤道附近南北纬１０度之间２２个站的水位观测资料和位于１４０°Ｗ浮标站的海流资料，分析了热带太平洋赤道区域低频波动的特征，发现季节内时间尺度的变化在赤道海区是一个普遍的现象。热带西太平洋海区上层海洋季节内时间尺度的变化可由具有东传性质的Ｋｅｌｖｉｎ斜压模态的波动和具有西传性质的Ｒｏｓｓｂｙ斜压模态的传播所引起，在赤道上，东向传播的波速约为２．７ｍ／ｓ，在赤道以北，西向传播的波速约为１．６ｍ／ｓ。在赤道东太平洋２５０ｍ的深度上，可以发现西太平洋低频变化对该处流速的影响，从西太平洋传播到东太平洋的平均速度大约１．３ｍ／ｓ。中太平洋低频变化具有驻波的特征，１９８６～１９８７ＥｌＮｉｎｏ事件的发生与这种驻波振荡有关。
The characteristics of low frequency fluctuations in the equatorial Pacific are analyzed using the observed water level data of 22 stations at the latitude 10 degrees north and south of the equator and the current data at the 140 ° W floating station. It is found that the variation of the time scale in the equatorial Pacific is a common phenomenon. The variation of the time scale in the upper ocean seasons in the tropical Western Pacific Ocean can be caused by the fluctuation of Kelvin baroclinic mode with eastward nature and the Rossby baroclinic mode with westward nature. The wave velocity propagating on the equator and eastward About 2.7m / s, the wave velocity in the north and west of the equator is about 1.6m / s. At a depth of 250 m in the eastern equatorial Pacific, the impact of the low-frequency changes in the western Pacific on the flow rate can be seen. The average velocity from the western Pacific to the eastern Pacific is about 1.3 m / s. The low-frequency variations in the Central Pacific have the characteristics of standing waves. The occurrence of Elinino events from 1986 to 1987 was related to this standing wave oscillation.