利用位涡反演方法对一次台风暴雨过程的成因分析
投稿时间: 2018-03-10  最后修改时间: 2018-03-31  点此下载全文
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罗丽君 南京信息工程大学 281435075@qq.com 
中文摘要:本文采用NCEP FNL的客观分析资料,以及中国自动站与CMORPH的逐小时降水融合资料,对2015年8月23日至24日发生于上海地区的一次强降水天气过程进行了天气学分析,并通过位涡反演方法对1515号台风“天鹅”对本次降水过程的具体影响进行了定量诊断分析,以探讨本次暴雨过程的发生机制,得出以下主要结论:(1)位涡反演方法能够较为准确地反映西风槽、台风及副热带高压等重要天气系统的位置及强度,能够较为有效地再现系统的演变过程;(2)北方冷空气与远距离台风外围的东北气流交汇是产生本次降水过程的主要原因;(3)通过对比原始场与剔除台风后的分析场,可以发现台风“天鹅”本身的扰动对应的水汽通量占比53.3%,是本次降水过程的水汽输入的主要贡献来源;(4)台风“天鹅”对降水区域提供了一定的热力条件,在扣除台风后原分析场的大值区和暖湿舌消失,相应的锋区也消失。
中文关键词:台风暴雨 位涡反演 水汽贡献
 
Analysis of the causes of a typhoon rainstorm process using the potential vortex inversion method
Abstract:Based on the objective analysis data of NCEP FNL and the precipitation data of China's automatic station and CMORPH, the paper carried out a synoptic background analysis of a heavy precipitation process in Shanghai from August 23 to 24, 2015.The quantitative analysis of the specific impact of the 1515 typhoon "Swan" on this precipitation process was conducted by means of the potential vorticity inversion method, to explore the mechanism of the rainstorm process,and the following main conclusions were drawn: (1) The method of vorticity inversion can accurately reflect the characteristics of the westerly trough , Typhoon and subtropical high pressure and other important weather system, can effectively reproduce the evolution of these systems; (2)The main reason for this precipitation process is the intersection of north cold air and the northeast air flow over long-distance typhoon;(3) By comparing the original field with the analysis field after removing the typhoon, it can be found that the water vapor flux corresponding to the disturbance of the "Swan" of the typhoon accounts for 53.3%, which is the water vapor input of the precipitation; (4) Typhoon Swan provided certain thermal conditions for the precipitation area. After the typhoon was deducted, the large value area and the warm wet tongue of the original analysis field disappeared, and the corresponding frontal area disappeared.
keywords:Typhoon rainstorm, Vorticity inversion, Water vapor contribution
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