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《Chinese Journal of Atmospheric Sciences》 2001-03
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A Diagnosis of the Heat Balance in the Western Equatorial Pacific Warm Pool during the Westerly Wind Bursts

Liu Hailong, Zhang Xuehong and Li Wei (State Key Laboratory of Numerical Modeling Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029)  
The responses of sea surface temperature (SST) in the western equatorial Pacific warm pool to the Westerly Wind Bursts (WWBs) play an important role in the relationship between WWB and ENSO. By using data collected from eight buoys of TOGA (Tropical Ocean-Global Atmosphere)-COARE (Coupled Ocean-Atmosphere Response Experiment), the heat balances of the upper ocean in the western equatorial Pacific around 0°, 156°E during two WWB events are calculated according to Stenven and Niller's method. In both events, SST varied with the common character in that it increased before and after the WWBs and decreased within the WWBs. The range of SST amplitudes approximated to 1℃. On the intraseasonal time scale, the variation of SST was dominated by the surface heat flux. On the other hand, the results show that the horizontal heat advection was an important factor in the heat balance and sometimes it may become the biggest term in the heat balance. The main differences in the heat balance between the two WWBs were compared. The different variation of thermal and currents structures in the mixing layers on seasonal time scale accounted for the different varintion of the heat balance during the two events. Additionally, evident variations of the depth of the mixing layer were observed in the two events. And the currents structures and the eastward prop agation of WWBs was considered to be the primary factor which causes the differences of the depth variations of the mixing layer.
【Fund】: 国家“九五”重中之重项目!“我国短期气候预测系统的研究”(96-908-02-03);; 优秀国家重点实验室研究项目!(4982-3
【CateGory Index】: P734.4
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