气象2016，Vol.42Issue(5)：567-577,11.DOI:10.7519/j.issn.1000-0526.2016.05.006
江苏沿江地区一次强冰雹天气的中尺度特征分析
Mesoscale Characteristics of a Severe Hail Event over the Area Along Yangtze River in Jiangsu
摘要
Abstract
A severe hail event occurred along Yangtze River in Jiangsu on 28 April 2015.Based on the data of AWS observation,geostationary satellite,Doppler weather radar and wind profiler radar,this paper an-alyzes the characteristics of the synoptic weather pattern,thermodynamic conditions,changes of ambient wind field before hailstorm,and structure of the supercell storms.The results show that first,with Northeast vortex and the dry and cold airflow at the back of vortex trough,unstable stratification is formed by the dry and cold airflow in the mid-high level and the warm and humid airflow in the low level, the configuration of the high and low level j et and the surface convergence system provide a favorable ther-mal condition.The high CAPE values,inversion layer,favorable water vapor in the low layer and the strong deep vertical wind shear are conducive to the occurrence of severe hail weather.Second,the vertical distribution of physical quantity fields,such as average divergence,the mean vertical velocity,relative storm helicity,vertical wind shear,retrieved by the Doppler weather radar and the wind profiler radar datacan reflect the rapid change of the ambient field,which is gradually adjusted into the pattern of low-level convergence and upper-level divergence,and the values of the helicity and vertical wind shear are gradually increased before the convective system moves into the area of the radar station.Such situation indicates that the ambient field is suitable for the maintenance and development of the severe convective system. Third,besides the TBSS phenomena and the front inflow notch found in the radar echo of the severe hail supercell,the prominent bounded weak echo area and suspended high strong echo area are made by the persistent deep mesocyclone.The inner loop structure of the supercell is revealed by the application of the dual-Doppler radar wind field retrieval technique.The ambient field is cyclonic rotation in the low level while rotation in the middle level is strengthened and the wind field in the high level is diverged.The emer-gence and maintenance of the vortex in the supercell contribute to the growth of large hail in the air.关键词
强冰雹/雷达中尺度特征/双多普勒风场反演/涡旋特征Key words
severe hail/radar mesoscale characteristics/dual-Doppler radar wind field retrieval/vortex characteristics分类
天文与地球科学引用本文复制引用
徐芬,郑媛媛,肖卉,慕熙昱..江苏沿江地区一次强冰雹天气的中尺度特征分析[J].气象,2016,42(5):567-577,11.基金项目
2016年1月18日收修定稿 （）
