2019年春夏广西两次冰雹过程特征分析  

Comparative Analysis of the two hail processes in spring and summer of 2019 in Guangxi

作　　者：梁虹 何林宴 王盛繁 Liang Hong;He Linyan;Wang Shengfan(Guigang Meteorological Bureau,Guigang Guangxi 537100)

机构地区：[1]贵港市气象局,广西贵港537100

出　　处：《气象研究与应用》2020年第3期79-84,共6页Journal of Meteorological Research and Application

基　　金：广西气象局气象科研计划项目(桂气科2020M06)。

摘　　要：利用常规气象资料、自动站资料、多普勒雷达资料,对比分析了2019年3月5日和5月25日两次广西冰雹天气的环流形势及物理量的配置、雷达回波特征。结果表明,“0305”过程由高空冷槽、低空切变线和地面冷锋触发,“0525”过程则由深厚暖平流、西南暖低压边缘辐合线共同作用而触发;“0305”过程中低层有强的垂直风切变,较厚的冻结层厚度和相对较小的对流有效位能,“0525”的过程则是较大对流有效位能与中等强度的垂直风切变、相对较薄的冻结层配合;雷达资料上,相比“0305”过程,“0525”过程具有强的反射率因子、回波伸展高度和更大VIL值与跃升幅度。Based on the conventional meteorological data,automatic station data and Doppler radar data,the weather situation configuration,physical quantity configuration and radar echo characteristics of the two hail weather processes in Guangxi on March 5 and May 25,2019 were compared.The"0305"process is triggered by the high-altitude cold trough,the low-altitude shear line and the ground cold front,while the"0525"process is triggered by the combined action of the deep warm advection and the edge convergence line of the southwest warm low pressure.In the"0305"process,there was a strong vertical wind shear in the lower layer,a thicker frozen layer thickness and relatively small convective effective potential energy.The process of"0525"was the coordination of large convective effective potential energy with moderate vertical wind shear and relatively thin frozen layer.According to the radar data,compared with the"0305"process,the"0525"process has a stronger reflectivity factor,echo extension height,and a larger VIL value and jump amplitude.

关 键 词：冰雹 切变线 三体散射 旁瓣回波 

分 类 号：P458.121.2[天文地球—大气科学及气象学]