[Abstract] A linear west tropical Pacific model is propsed in this paper, which consists of a mixed layer and a thermocline with different temperatures and densities. By analyzing the barometric response of the west tropical Pacific to wind stress, the distributions of the termocline dense, the current and the sea temperature are obtained analytically. The results show that anormal variations in the west tropical Pacific play an important role in the events El Nino/La Nina. The amplitude of the thermocline temperature is much greater than that of the mixed layer. This model can be used to explain the observational facts in recent years.
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