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西风爆发时赤道西太平洋的热量平衡:个例分析
作者姓名:Liu Hailong  Zhang Xuehong  Li Wei
作者单位:Liu Hailong Zhang Xuehong and Li Wei LASG,Institute of Atmospheric Physics,Beijing 100029
基金项目:This work was co-supported by the National Key Project (Grant No, 96-908-02-03), the National Natural Science Foundation of Chi
摘    要:The responses of sea surface temperature (SST) in the western equatorial Pacific warm pool to the west erly wind bursts (WWBs) play an important role in the relationship between WWB and ENSO. By using da ta 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 were calculated according to Stevenson and Niiler's (1983) method. In both events, SST increased before and after the WWBs, while decreased within the WWBs. The SST amplitudes approximated to l℃. Although sometimes the horizontal heat advections may become the biggest term in the heat balance, the variation of SST was dominated by the surface heat flux. On the other aspect, some different features of the two events are also revealed. The two cases have different variation of mixed layer depth. The depth of mixed layer is almost double in the first case (35 m to 70 m), which is caused by Ekman convergence, while only 10m increments due to entrainment in the second one. There are also differences in the currents structure. The different variations of thermal and currents struc ture in the mixing layers accounted for the different variation of the heat balance during the two events, es pecially the advection and residue terms. The seasonal variation of SST in this area is also investigated sim ply. The first WWB event happened just during the seasonal transition. So we considered that it is a normal season transition rather than a so-called anomaly. That also suggested that the seasonal distinction of the WWB is worthy of more attention in the researches of its relationship to ENSO.

关 键 词:西风爆发  赤道西太平洋  热量平衡

The Heat Balance in the Western Equatorial Pacific Warm Pool during the Westerly Wind Bursts: A Case Study
Liu Hailong,Zhang Xuehong,Li Wei.The Heat Balance in the Western Equatorial Pacific Warm Pool during the Westerly Wind Bursts: A Case Study[J].Advances in Atmospheric Sciences,2001,18(5):882-896.
Authors:Hailong  Liu  Xuehong  Zhang  Wei  Li
Institution:LASG, Institute of Atmospheric Physics, Beijing 100029,LASG, Institute of Atmospheric Physics, Beijing 100029,LASG, Institute of Atmospheric Physics, Beijing 100029
Abstract:Advances in Atmospheric Sciences - 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...
Keywords:Westerly wind burst  The western equatorial Pacific warm pool  Heat balance
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