“苏拉”台风登陆福建后降水非对称成因分析
投稿时间: 2017-02-22  最后修改时间: 2017-06-18  点此下载全文
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作者单位E-mail
蔡菁 福建龙岩市气象局 caijing19870630@126.com 
中文摘要:本文利用常规天气资料、NCEP1°×1°再分析资料、卫星云图、新一代天气雷达等资料对2012年第9号台风“苏拉”降水预报失败的原因及其暴雨成因进行分析,结果表明:此次台风暴雨预报失败的主要原因在于预报过程中没有关注台风垂直结构的改变及其对降水落区的影响。“苏拉”台风暴雨是在中高纬稳定的环流形势下发生的,低层到高层引导气流的变化导致“苏拉”高层风暴中心向南倾斜;环境风垂直切变导致了台风降水的非对称分布,环境风垂直切变方向的左侧是强降水发展的区域;另外,随着台风环流中心在垂直方向发生偏移,改变了涡度平流的垂直分布,导致福建省南部的暴雨。因此关注登陆台风中心在垂直方向的偏移对台风降水预报非常重要。
中文关键词:“苏拉”台风  非对称分布  台风降水  引导气流  环境风垂直切变
 
Analysis of the Precipitation Asymmetries of Typhoon Saola After its Landfall on Fujian Province
Abstract:By using the conventional meteorological data、NCEP1°×1° reanalysis data 、Satellite Images data and CINRAD/SA data,the reason for the failure of the foecast and the cause of the heavy rainfall after Saola Typhoon landing is analyzed.The results show that :The main reason for the large deviation of typhoon rainstorm forecast and actual situation is that little attention has been paid to the change of the vertical structure of typhoon and its impact on the precipitation area during the forecasting process.The stable circulation background of high latitude provides favorable conditions of asymmetric distribution of typhoon precipitation;the change of steering flows in the vertical tilted the typhoon center southward with height;the change of the vertical wind shear leads to the asymmetric distribution of Saola Typhoon, and the area of heavy rainfall is on the left of downshear;In addition,while the typhoon center southward with height, the distribution of the vorticity has to been changed, so the heavy rainfall happened over the southern Fujian proivince. Therefore; it is important to pay attention to the change of the vertical structure of typhoon.
keywords:Saola Typhoon  Asymmetric distribution  Precipitation associated with typhoon  Steering flows  environmental vertical wind shear
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