| 台风暴雨大气熵变场的诊断和对比分析 |
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| 引用本文： | 符长锋.台风暴雨大气熵变场的诊断和对比分析[J].应用气象学报,1991,2(4):408-415. |
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| 作者姓名： | 符长锋 |
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| 作者单位： | 1.河南省气象科学研究所 |
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| 摘 要： | 本文借助于熵平衡方程，对两个深入内陆的台风暴雨过程在负熵流作用下的减熵运动进行了诊断和对比分析，得到了以下结果:（1）台风大范围暴雨和强的负熵变相对应，因此可比常规方法较好地分辨出暴雨落区；（2）负熵变的汇合能够清楚地反映出中、低纬度天气系统的相互作用，为特大暴雨和台风远距离影响的特大暴雨的出现提供先兆；（3）本文导出的熵密度变化方程可以阐明，雨区内系统的发生、发展是和降水导致熵减小的物理过程相联系的；（4）大气熵辐散，特别是中、高层的熵辐散，对暴雨发生和持续的作用，不仅和潜热加热同样重要，甚至更有决定性意义。
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Diagnostic and Comparative Analysis of the Atmospheric Entropy Changing Fields of Typhoon Heavy Rain Process |
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| Affiliation: | (Meteorological Research Institute of Henan Province) |
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| Abstract: | With the aid of the atmospheric entropy balance equation, the diagnostic and comparative analyses of the entropy reduction motion under the action of the negative entropy flow during the typhoon heavy rain have been conducted. The results are as follows: (1) The large-scale heavy rain caused by typhoon corresponds with intense and negative entropy change. So it is better than the conventional synoptic method to resolve the heavy rain areas. (2) The interaction between synoptic systems of the mid and low-latitude belts can be clearly represented in the confluence of negative entropy changes which provide a sign of the intense and hard rain processes or hardstorm rainfall affected by the typhoon far from rain area. (3) It can be explained by the equation of entropy density variation that the genesis and development of synoptic system in the rain area are associated with the physical process of the atmospheric entropy reduction resulted from precipitation. (4) The effect of atmospheric entropy divergence, especially in mid- and upper-levels, on the occurrence and maintenance of heavy rain is as important as heating, even more important. |
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