绥化市一次冷涡背景下的强对流天气成因分析  

Analysis of the Causes of Severe Convection Weather under the Background of A Cold Vortex in Suihua City

作　　者：李莹[1] 买永瑞 孙亮[1] 班秋艳[1] Li Ying(Suihua Meteorological Bureau,Suihua,Heilongjiang 152000)

机构地区：[1]绥化市气象局,黑龙江绥化152000 [2]海南藏族自治州气象局,青海共和813000

出　　处：《农业灾害研究》2023年第11期222-224,共3页Journal of Agricultural Catastrophology

摘　　要：利用常规气象观测资料、区域自动站资料和雷达资料,分析2020年6月28日冷涡背景下绥化市出现的强对流天气成因。结论如下:(1)高层脊前的干冷气流与低层的暖湿气流形成上干下湿不稳定状态,有利于对流的发生;(2)绥化地区低层湿度较大,偏东气流加强了水汽输送,有利于风雹天气产生;(3)探空图上有明显的“喇叭口”,对流有效位能、K指数、沙氏指数均指示着大气为不稳定状态,有利于冰雹的发生;(4)地面辐合线造成辐合抬升,触发强对流天气,湿舌前端形成对流系统和冷池,易出现风雹天气;(5)较强的基本反射率对应强降水区,“V”形缺口、垂直液态水含量大值区、高悬的强回波中心是冰雹的特征。Using conventional meteorological observation data,regional automatic station data,and radar data,the causes of severe convective weather in Suihua City on June 28,2020 under the background of a cold vortex were analyzed.The conclusions were as follows:(1) The dry and cold air in front of the upper ridge and the warm and wet air in the lower layer form an unstable state,which is conducive to the occurrence of convection;(2) The low humidity in Suihua area is relatively high,and the easterly air flow strengthens the water vapor transport,which is conducive to the generation of wind and hail weather;(3) There is an obvious "horn" on the radiosonde map,and the convective effective potential energy,K index and Sand index all indicate that the atmosphere is unstable,which is conducive to the occurrence of hail;(4) The surface convergence line causes convergence uplift,triggering strong convective weather,forming convective system and cold pool at the front of the wet tongue,which is prone to wind and hail weather;(5) Strong basic reflectance corresponds to strong precipitation area,and "V" notch,vertical liquid water content area,and high overhanging strong echo center are the characteristics of hail.

关 键 词：冷涡 强对流 中尺度 雷达回波 

分 类 号：P458[天文地球—大气科学及气象学]