杨竹云, 杞明辉, 杨素雨, 严华生. 台风“启德”影响云南强降水过程分析[J]. 云南大学学报(自然科学版), 2014, 36(S1): 70-76. doi: 10.7540/j.ynu.20120641
引用本文: 杨竹云, 杞明辉, 杨素雨, 严华生. 台风“启德”影响云南强降水过程分析[J]. 云南大学学报(自然科学版), 2014, 36(S1): 70-76. doi: 10.7540/j.ynu.20120641
Analyses of heavy rainfall process in Yunnan influenced by the typhoon “Kaitak”[J]. Journal of Yunnan University: Natural Sciences Edition, 2014, 36(S1): 70-76. DOI: 10.7540/j.ynu.20120641
Citation: Analyses of heavy rainfall process in Yunnan influenced by the typhoon “Kaitak”[J]. Journal of Yunnan University: Natural Sciences Edition, 2014, 36(S1): 70-76. DOI: 10.7540/j.ynu.20120641

台风“启德”影响云南强降水过程分析

Analyses of heavy rainfall process in Yunnan influenced by the typhoon “Kaitak”

  • 摘要: 利用NCEP/NCAR再分析资料及云南省气象台提供的常规观测资料,分析了2012年8月17日20时—20日08时由于“启德”台风低压西移后引发的滇南和滇西出现大到暴雨局部大暴雨天气过程.结果表明:①西太平洋副高西伸加强及西部型南亚高压是此次“启德”台风低压西移的环流背景,受其北部外围的偏东风气流影响,云南南部及西部出现强降水天气;②通过比湿、相对湿度、垂直速度、散度及K指数的分析,发现强降水区(21°~23°N,98°~106°E)上空充足的水汽、低层辐合高层辐散、气压系统发生和发展、强烈的上升运动及不稳定能量为此次滇南暴雨提供了有利条件;③进一步分析水汽通量和水汽通量散度场得出,台风低压东部偏南气流引导南海的水汽源源不断地进入云南东南及以南地区,形成了一条很强的水汽输送通道,滇中以南为一水汽辐合的大值带.

     

    Abstract: Based on the reanalysis data by the NCEP/NCAR and conventional observation data by meteorological observatory of Yunnan,the heavy-hard rain and local cloudburst in the south and west of Yunnan from 20:00 17 to 08:00 20 Aug 2012 caused by the typhoon “Kaitak” moving westward was analyzed.The result indicated that firstly,the circulation background of typhoon “Kaitak” moving westward was the west Pacific subtropical high enhanced and stretching westward and the west phase of the south Asia high.The heavy rainfall in the south and west of Yunnan was caused by the easterly jet of typhoon northern periphery.Second,it was found that the sufficient moisture in the air,low level convergence and high level divergence,pressure system onset and progression,severe ascending air and unstable energy were beneficial for causing heavy rain in the south of Yunnan by specific humidity,relative humidity,vertical,velocity,divergence and index K in heavy rain area(21°—23°N,98°—106°E).Third,further analyzes by vapor flux and vapor flux divergence indicated that there was a powerful moisture channel,which South China Sea water vapor was transported to the southeast and south of Yunnan by the typhoon east southerly current,so the water vapor vonvergence of high value was in the central and south of Yunnan.

     

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