2012年9月2~3日浙中地区强对流过程分析

Abstract

利用常规观测资料、NCEP实时再分析资料及多普勒雷达资料对2012年9月2~3日夜里浙中地区一次强对流天气过程进行诊断分析。结果表明：过程前期低层增温增湿有利于不稳定层结形成与不稳定能量积累，高空西北气流的引导作用下，冷空气和中低层切变线触发了这次强对流天气过程；对流区上空湿度层结结构的差异，导致本次强对流天气以短时强降水为主；高层存在下伸的θse呈漏斗状分布，在锋区上有较大的上升运动与比湿，有利于对流性天气产生；雷达回波图上以回波结构致密、低质心高效率的强降水回波为主；雷达反射率因子和径向速度特征变化揭示了强对流天气发展消散规律；金衢盆地地形对暴雨增幅以及强对流增强作用较明显。 The conventional observations, NCEP reanalysis grid data and Doppler Radar data, are used to diagnose and analyze a Strong Convection Event occurred in the central Zhejiang Province on 2nd to 3rd September 2012 .The results show that: The process early low-level warming humidification is conducive to the formation of unstable stratification and unstable energy accumulation; the guiding role of the high-altitude northwest flow of cold air and level wind shear line triggered the strong convection weather process; the differences of humidity stratification structure over the convection zone, resulting in the strong convective weather is given priority to with short-term heavy precipitation; the senior stretched out in the presence of θse, projecting funnel-shaped distribution, larger upward motion and specific humidity in the frontal zone, is advantageous to the convectional weather; the radar data showed the details of dense structure, high efficiency and low quality strong precipitation echo for the 2nd September event; the characteristics of radar reflectivity factor and radial velocity change reveals the law of development and dissipation occurred in the strong convection weather; the Jinqu basin topography played an important role in increasing the rainstorm and strengthen the strong convection.