盛夏杭州湾一次海风锋触发雷暴的数值模拟分析

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较好地模拟出此次雷暴过程的降水和低层风场、温度场分布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条件。4)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。

Numerical simulation study on a thunderstorm triggered by sea breeze front in Hangzhou Bay in summer

The development and evolution of a thunderstorm triggered by a sea breeze front on 28th July 2016 in Hangzhou Bay was studied by numerical simulation using the high resolution mesoscale model WRF,conventional meteorological data,Doppler radar data,encrypted data of Zhejiang Automatic Station and NCEP/FNL reanalysis data.The results revealed the following:1) The sea breeze front is the main trigger system for the thunderstorm.2) The numerical simulation with WRF can accurately reproduce the precipitation of the thunderstorm and the horizontal and vertical structure of the sea breeze front.3) There are evident promoting effects on the strengthening of the 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) Analysis of the mutation position of the evolution curve of the convective parameters exhibits certain indication and prediction significance for the time of thunderstorm occurrence.Only one sea breeze front on the southern side of Hangzhou Bay can also trigger a thunderstorm.