热带气象学报2012，Vol.28Issue(3)：425-432,8.DOI:10.3969/j.issn.1004-4965.2012.03.015
2011年4月17日广东强冰雹天气过程的成因及特征分析
ANALYSIS OF THE CAUSES AND CHARACTERISTICS OF A STRONG HAIL WEATHER PROCESS ON APRIL 17, 2011 IN GUANGDONG PROVINCE
摘要
Abstract
Using the data of the next-generation radar in Guangzhou and Micaps, a hail weather process on April 17, 2011 in Zhaoqing, Guangdong province was analyzed with the focus on the circulation and affecting systems, especially the factors favorite for large hail and radar echo. The results are as follows. (1) There were an upper-level jet and wind shear and though that combined with a surface front, and it was a typical situation for the annually first raining season convection in the Xijiang River basin. The low layer vertical wind shear reached -4.8×103 /s. (2) CAPE increased suddenly, with SSI>200, K>35 ℃ and Si<0 ℃, indicating that there would be severe convection. (3) A boundary convergence line drove the development of convection factors, while the instable atmosphere and high CAPE result in the rapid development of the hailstorm. (4) The storm shows many significant features of severe convection, such as a bow echo, rear influx dent, suspension, BWER, three-body scatter spike(TBSS) in base reflectivity, and meso-cyclone and MARC in radical velocity. (5) The storm echo's top height and maximum reflectivity have basically the same trend of evolution, and experienced a few jumps in general synchronization. DBZM and DBZM HT dropped dramatically before the hail storm appeared. The characteristics of the jump of VIL was effective to confirm the growth of hail. (6) There were favorite height conditions of 0 ℃ and-20 ℃ layer for the hail, and the height of severe echo reached above the layer of-20 ℃. The densities of VIL large than 4 g/m3, and the structure of a dry upper-level associated with a wet low-level are the good conditions for this large hailstorm. (7) The feature of three-body scatter spike(TBSS) can be taken as an important index in issuing warnings.关键词
天气学/冰雹/多普勒雷达/边界层辐合线/三体散射Key words
synoptic meteorology/ hail/ doppler weather radar/ boundary convergence line/ three-body scatter spike(TBSS)分类
天文与地球科学引用本文复制引用
郭媚媚,赖天文,罗炽坤,胡胜,谌志刚..2011年4月17日广东强冰雹天气过程的成因及特征分析[J].热带气象学报,2012,28(3):425-432,8.基金项目
广东省气象局气象科技项目“肇庆市柑橘气象灾害监测系统”(201031)资助 （201031）
