Impact of the central pacific zonal wind on the central pacific pattern El nino event

The central Pacific zonal wind divergence and convergence index (CPZI) is defined in this paper, and the forming mechanism of CP El Nino (La Nina) events is discussed preliminarily. Results show that the divergence and convergence of the zonal wind anomaly (ZWA) is the key process in the forming of CP El Nino (La Nina) events. Correlation analysis between the central Pacific zonal wind divergence and convergence index and central Pacific El Nino index indicates that there is a remarkable lag correlation between them. The central Pacific zonal wind divergence and convergence index can be used to predict the CP events.