冀西北地区一次大冰雹过程的双偏振雷达特征分析  

Dual-polarization Radar Characteristic Analysis of a Heavy Hail Process in Northwest Hebei

作　　者：姬雪帅 黄若男 王淼 段雯瑜 韩丽娟 郭宏 JI Xueshuai;HUANG Ruonan;WANG Miao;DUAN Wenyu;HAN Lijuan;GUO Hong(Zhangjiakou Meteorological Bureau,Heibei,Zhangjiakou 075000)

机构地区：[1]河北省张家口市气象局,张家口075000

出　　处：《气象科技》2023年第3期409-418,共10页Meteorological Science and Technology

基　　金：张家口市劳动模范和工匠人才创新工作室和张家口市气象局科研课题(JL2022-10)资助。

摘　　要：利用常规气象资料、ERA5再分析资料以及雷达资料,对2022年6月10日发生在冀西北地区的一次大冰雹天气过程进行分析。结果表明:(1)此次冰雹天气发生在冷涡的东南象限、低空切变线前侧暖区,对流由局地的热力作用触发并在辐合线附近发展加强。(2)降雹过程可分为3个阶段,前2个阶段为2个不同的超级单体分别影响而形成,粒子相态识别结果主要为干冰雹粒子,雷达回波具有高反射率因子、低差分反射率因子、高相关系数和低差分相移率的特点;第3个阶段为2个超级单体合并后形成,除冰雹外还出现了局地的短时强降水,直径较大且数密度较多的大雨滴造成了短时强降水。(3)利用雷达反演的风场可以分析对流单体的动力结构,通过分析不同阶段单体的动力结构得到单体未来的移动方向与发展趋势,特别是垂直剖面中上升气流的强度对单体的发展趋势有重要指示意义。Based on the conventional meteorological data,ERA5 reanalysis data and Doppler radar data,a heavy hail weather process in northwestern Hebei Province on June 10,2022,is analyzed.The results show that:(1)The hail occurred in the southeast quadrant of the cold vortex and the warm area in front of the low-level shear line.The convection was triggered by the local thermal factor and strengthened near the surface convergence line.(2)The hail process could be divided into three stages.The first two stages were formed by two different supercells,respectively.The identification results of hydrometeor were mainly dry hail particles.The radar echoes were characterized by high reflectivity,low differential reflectivity,high correlation coefficient and low differential phase.In the third stage,two supercells merged and formed.Besides hail,local flash rain also occurred.The flash rain was caused by large raindrops of larger diameter and more numerous.(3)The wind field retrieved by radar could be used to analyze the dynamic structure of convection cells,and the future moving direction and development trend of cells could be obtained by analyzing the dynamic structure of cells in different stages.In particular,the strength of updraft in the vertical profile had important indicative significance for the development trend of monomers.

关 键 词：双偏振雷达 大冰雹 粒子相态识别 雷达风场反演 

分 类 号：P445.1[天文地球—大气科学及气象学]