珠江三角洲重大灾害性强风暴的环境流场研究
A STUDY ON ENVIRONMENTAL FLOW CONDITIONS OF SEVERE CONVECTTVE STORMS IN PEARL RIVER DELTA
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摘要: 急流是大气环流的重要成员,它与整个大气环流活动的关系以及与某些特定天气过程的联系早已成为天气学研究中的一个重要内容,并有系统的总结[1]。在我国,对急流同某些重要天气过程(如暴雨)的联系,也有不少研究结果[2,3,4]。但它们多是分析讨论高、低空急流同暴雨成因方面的一些研究。对于强风暴,尤其是珠江三角洲的强风暴同急流联系的少数研究中也多是个例分析。本文则是从历史资料普查入手,统计分析急流同珠江三角洲地区灾害性强风暴的关系,以期得到珠江三角洲强风暴与急流相关性的一Abstract: Based on more than sixty cases of severe convective weather processes in Pearl River Delta during 1971-1983, the large scale environmental flow conditions of severe convective storm including the statistical characteristics of allocation of the lower and upper layer jets, the vertical wind shear and its seasonal variation et al., are analyzed. The meso-scale features of the severe convective storm are separated from the large-scale background flow of two well-developed cases by using a band pass (λMax=800-1500km) filter.
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