A Simple Coupled Model Of The Indo-Pacific Ocean-Atmosphere

An intermedia couple model with effect of the heat flux was used in this study for the analysis of the dynamical and thermodynamical air-sea feedbacks in the tropical Indian Ocean forced by El Ni?o-Southern Oscillation (ENSO). To achieve the dynamical air-sea feedback, an empirical model constructed from patterns obtained by the singular value decomposition (SVD) statistical technique that determines wind stress anomalies from model sea surface temperature (SST); To achieve the thermodynamical air-sea feedback, the bulk formula that calculates the heat flux from model SST and wind speed anomalies was used. After tested, both SVD statistical model and bulk formula can get the information of atmosphere.Analyzing dynamical model results, the first empirical orthogonal function (EOF) mode is accorded with observation in the tropical Pacific. The result from power spectrum about Ni?o 3 index can get around 2 years interannual variability. This suggests the dynamical air-sea feedback dominated the development of ENSO. To research the thermodynamic effect from ENSO in the tropical Indian ocean, the thermodynamical air-sea feedback was combined. The result is, the center of positive anomaly in the tropical Pacific has more information like observation, and the more positive anomaly generated in the tropical Indian Ocean, especially in the West Indian Ocean. This suggests that ENSO accomplishes atmospheric teleconnection to the tropical Indian Ocean through the air-sea heat flux changes, generated positive anomaly in the basin .