盛夏杭州湾一次海风锋触发雷暴的数值模拟分析
投稿时间:2018-03-30  修订日期:2018-05-13  点此下载全文
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作者单位E-mail
吴福浪 中国民用航空宁波空中交通管理站 15990276093@163.com 
中文摘要:利用常规气象观测资料、多普勒气象雷达资料、浙江省自动站加密资料、NCEP/FNL再分析资料,结合高分辨率中尺度数值模式WRF对杭州湾地区2016年7月28日一次海风锋触发雷暴天气的发生、发展演变特征进行数值模拟,结果表明:(1)海风锋是此次强雷暴天气过程的主要触发系统。(2)中尺度模式WRF较好的模拟出此次雷暴过程的降水以及海风锋水平垂直结构。(3)海风锋对局地比湿及涡度特征的加强有明显的促进作用,为雷暴的发生发展提供有利的水汽和动力学条件。(4)θ_se随高度的变化是引起对流性不稳定局地变化的主要原因之一。(5)分析对流参数演变曲线的突变位置,对雷暴发生的时间有一定的指示和预报意义;杭州湾南侧单纯的海风锋也可以触发雷暴的发生发展。
中文关键词:海风锋  雷暴  数值模拟  WRF
 
Numerical simulation study on a thunderstorm triggered by sea breeze front in the Hangzhou Bay in summer
Abstract:The development and evolution of a thunderstorm triggered by sea breeze front on 28th July 2016 in Hangzhou Bay was numerical simulation studied by using the high resolution mesoscale model WRF, the conventional meteorological datas, Doppler radar datas, the encrypted datas of Zhejiang automatic station and NCEP/FNL reanalysis datas. The results show that: (1) Sea breeze front is the main trigger system for the thunderstorm. (2) The numerical simulation with WRF can well reproduce the precipitation of the thunderstorm and the horizontal and vertical structure of sea breeze front. (3) There are obvious promoting effect on the strengthening of humidity and vorticity characteristics of the sea breeze front, which provides favorable water vapor and dynamic conditions for the occurrence and development of the thunderstorm. (4) The change of θ_se with height is one of the main reasons for the local change of the convective instability. (5) Analysis of the mutation position of the evolution curve of the convective parameters has certain indication and prediction significance for the time of thunderstorm occurrence. Only one sea breeze front on southern side of Hangzhou bay can also trigger a thunderstorm.
keywords:Sea breeze front  Thunderstorm  Numerical simulation  WRF
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