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《Chinese Journal of Atmospheric Sciences》 2001-02
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Dynamical Role of Zonal Wind Stresses over the Tropical Pacific in the Occurring and Vanishing of El Nio Part II: Analyses of Modeling Results

Yang Bangliang, Huang Ronghui and Zhang Renhe (Institute of Atmospheric Physics , Chinese Academy of Sciences, Beijing 100080)  
A simple tropical numerical ocean model similar to Zebiak's one is built in order to analyze the dynamical role of zonal wind stresses over the tropical Pacific in the occurring and vanishing of EI Nino events. The model is used to simulate the SSTA variability with time from January of 1971 to August of 1998 by the observed wind stress (FSU) forcing. The results show that the model successfully simulates the variability of SSTA in Nino3 area with time. The correlation coefficient is 0.9 between observational and modeling SSTA over Nino3 area. The model can better simulate the horizontal SSTA variability with time during EI Nino events. In order to better understand the mechanism of SSTA spatial distribution with time, as an example, we analyze the SSTA propagating characteristics and its causes in the modeling and observational results over the equatorial Pacific in the ENSO cycle between 1986 and 1989. The model better simulates the observational SSTA propagating characteristics over the equatorial Pacific. That is, the SSTA propagates eastward from the end of 1986 to April of 1987 and westward from June of 1987 to February of 1988. The model results show that the zonal wind stress anomaly over the western and middle equatorial Pacific is very important to the occurring and vanishing of EI Nino events. The wind stress anomaly over the western and middle equatorial Pacific can initiate the eastward Kelvin wave. The eastward Kelvin wave is responsible for the SSTA propagating eastward. When the Kelvin wave reaches the east boundary, the westward propagating Rossby waves are initiated because of east boundary reflection. The westward propagating Rossby waves are responsible for SSTA propagating westward over the equatorial eastern Pacific. The propagating eastward Kelvin wave and the propagating westward Rossby waves from east boundary reflection are responsible for the second peak of SSTA in EI Nino events over the east equatorial Pacific.
【Fund】: 国家重点基础研究发展规划项目!G1998040900第一部分;; 国家自然科学基金资助项目!49475254、49635180
【CateGory Index】: P732
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