| 西风爆发时赤道西太平洋热量平衡的诊断分析 |
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| 引用本文： | 刘海龙,张学洪,李薇.西风爆发时赤道西太平洋热量平衡的诊断分析[J].大气科学,2001,25(3):303-316. |
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| 作者姓名： | 刘海龙 张学洪 李薇 |
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| 作者单位： | 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029 |
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| 基金项目： | 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)和优秀国家重点实验室研究项目(4982-3002)共同资助 |
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| 摘 要： | 西风爆发(WWB)对赤道西太平洋暖池SST的影响是WWB与ENSO相互作用的一个重要环节。作者运用TOGA(TropicalOcean-GlobalAtmosphere)-COARE(CoupledOcean-AtmosphereResponseExperiment)期间暖池海区8个浮标的观测资料，根 据Stenven和Niiler的热量平衡诊断方法，从能量平衡角度分析了赤道156°E附近SST对1992年9月到1993年1月期间两次WWB事件的响应。两次WWB期间，SST都是在 WWB之前和其后升温，而在WWB期间降温，升温和降温的幅度均为1℃左右。热量平衡分析结果表明，季节内时间尺度上海表热通量是导致赤道西太平洋暖池混合层温度变化的主要因素。在海表热通量中，短波辐射和潜热是变化量最大的两项，决定着净通量的正负，其他项的变化则相对较小。水平平流项有时可以超过海表热通量的作用，其作用不可忽略。两次WWB的过程中，季节变化造成的混合层的温盐结构和流场结构的差异是导致两次WWB事件时上层海洋热量平衡差别的主要因素。另外，混合层的厚度也有明显的变化，而混合层厚度变化的差异则是与流场的结构以及WWB的向东传播特征密切相关。
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| 关 键 词： | 西风爆发 赤道西太平洋 热量平衡 |
A Diagnosis of the Heat Balance in the Western Equatorial Pacific Warm Pool during the Westerly Wind Bursts |
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| Liu Hailong,Zhang Xuehong and Li Wei.A Diagnosis of the Heat Balance in the Western Equatorial Pacific Warm Pool during the Westerly Wind Bursts[J].Chinese Journal of Atmospheric Sciences,2001,25(3):303-316. |
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| Authors: | Liu Hailong Zhang Xuehong and Li Wei |
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| Abstract: | 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 Niiler＇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 dif
ferent variation 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 va riations of the mixing layer. |
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| Keywords: | westerly wind burst western equatorial Pacific heat balance |
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