WU Zhen-zhen,LIU Hai-wen,PAN Li-li.Analysis of a Binary Southwest Vortex and its Precipitation over the Sichuan Basin on 4-5 August 2011[J].Journal of Chengdu University of Information Technology,2018,(06):681-687.[doi:10.16836/j.cnki.jcuit.2018.06.014]
2011年8月4-5日四川盆地双核西南低涡 及其带来的降水天气分析
- Title:
- Analysis of a Binary Southwest Vortex and its Precipitation over the Sichuan Basin on 4-5 August 2011
- 文章编号:
- 2096-1618(2018)06-0681-07
- Keywords:
- meteorology; binary southwest vortex; three dimensional structure; heavy rainfall; water vapor
- 分类号:
- P447
- 文献标志码:
- A
- 摘要:
- 为研究双核西南低涡及其带来的降水天气,利用NCEP-FNL再分析资料、CMORPH降水资料,采用天气学诊断方法,对发生在2011年8月4-5日四川盆地的双核西南低涡天气过程进行了研究。结果表明,影响此次降水的西南低涡具有双核特征,其中,一个低涡C1的中心位置大约位于巴中附近,另一个低涡C2的中心位置大约位于凉山附近。两个低涡的冷暖结构并不相同,其中低涡C1初期为干冷低涡,并且随着南部暖湿空气北移,低涡C1逐渐转变为暖湿特征,而低涡C2一直维持暖湿结构特征。受来自孟加拉湾和南海的水汽影响下,在双核西南低涡存在的典型时段,在低涡C1和低涡C2之间产生了一明显的东北-西南向雨带。
- Abstract:
- In order to study the binary southwest vortex(SWV)and its associated precipitation weather, based on the NCEP-FNL reanalysis data, the CMORPH precipitation data this study studies a binary southwest vortex over the Sichuan Basin on August 4-5, 2011 by using the weather diagnosis methods. The results show that the binary SWV has binary structure, in which the center of the vortex C1 is located near the Bazhong and the center of the vortex C2 is located near Liangshan. The cold and warm structures of the two vortices are not the same.The initial stage of vortex C1 is a dry and cold vortex, and with the warm and moist air in the south moving northward, the vortex C1 gradually turns into warm and moist features, while the vortex C2 maintains a warm and moist structures. Under the influence of the water vapor from the Bay of Bengal and the South China Sea, an obvious northeast-southwest rainband occurs between the vortex C1 and C2 during the typical period of the binary SWV.
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备注/Memo
收稿日期:2018-03-12 基金项目:国家自然科学基金重点资助项目(91337215,41475051); 四川省科技计划资助项目应用基础计划资助项目(2015JY0109)。