2018年3月4日强对流过程多源资料分析

本文针对2018年3月4日苏州地区冬末春初的一次强对流天气过程,运用S波段多普勒雷达、C波段双偏振雷达、闪电定位仪和雨滴谱仪等资料对强对流天气中尺度特征进行分析,发现综合分析各种新型探测资料对于分类强对流监测预警有一定作用。分析表明:(1)冬末春初强对流发生的各种阈值与汛期强对流形成的阈值明显不同,虽然不稳定能量没有春夏高,但在动力条件下触发低层冷空气强烈抬升暖湿气流,继而引发局地冰雹、下击暴流和短时强降水的发生。(2)双偏振雷达可以有效识别强冰雹;下击暴流发生时反射率因子质心和VIL快速下降,低层风场为辐散及中层有径向辐合特征存在。(3)昆山短时强降水发生时雨滴数密度有突然增大特征。

Analysis of multi-source data of strong convective process in March 4, 2018

In this paper, based on a strong convective weather process in the late winter and early spring in Suzhou on March 4, 2018, the scale characteristics of strong convective weather are analyzed by using the data from S-band Doppler radar, C-band dual polarization radar, lightning locator and raindrop spectrometer. It is found that a comprehensive analysis of various new types of detection data plays a certain role in monitoring and early warning of the classified strong convection. The analysis shows that:(1) The threshold of strong convection in the late winter and early spring is obviously different from that in flood season. Although the unstable energy is not high in spring and summer, it triggers the low layer cold air to raise the warm wet air under the dynamic condition, and then leads to the occurrence of local hail, lower strike storm and short-term strong precipitation. (2) The dual polarization radar can effectively identify the strong hail, and the center of mass and the fast dropping of VIL when the lower strike storm occurs, the low layer wind field is radiant and the middle layer has radial convergence. (3) The density of raindrop increases abruptly in the short term when the short-term heavy rainfall occurs in Kunshan.