2018年4月濮阳春季首场暴雨天气过程的诊断分析  

Diagnosis Analysis of the First Rainstorm in April 2018 in Puyang

作　　者：唐影 杜丽娅 王聪 TANG Ying;DU Liya;WANG Cong(Puyang Meteorological Bureau,Puyang Henan 457000)

机构地区：[1]濮阳市气象局,河南濮阳457000

出　　处：《河南科技》2020年第28期149-152,共4页Henan Science and Technology

摘　　要：利用常规气象资料、区域自动站资料、卫星云图和濮阳雷达资料,对濮阳2018年4月21—22日首场春季暴雨进行综合分析,结果表明:该过程是在高空低槽、中低层暖式切变线、地面暖倒槽的共同作用下发生的,中低层暖切变线是此次暴雨的主要影响系统,超低空偏南急流提供了良好的水汽条件和能量条件;冷高压后部扩散冷空气入侵地面暖倒槽顶部,对流云团产生在倒槽东部和地面中尺度辐合线附近,造成强降水;较弱的低层垂直风切变说明对流过程以短时强降水为主,径向速度图上西北冷空气入流抬升低层暖湿气流,增加降水效率,触发形成短时强降水。Using the conventional meteorological observations,observational data from regional automatic weather sta⁃tions,satellite images and radar data,a diagnostic analysis of the cause of the first Spring Rainstorm in Puyang from 21 to 22 on April 2018 were analyzed comprehensively.The results show that:this event caused by the interaction of westerly trough,middle and low layer warm shear line and ground warm inverted trough.The main influence system of this process is the warm low layer shear line.The ultra-low jet provides good water vapor and energy conditions for this rainstorm.The diffuse cold intrudes into the top of the surface warm trough,forming a convergence line.Meso⁃scale convective forming strong precipitation clusters generated in east part of inverted trough and near the mesoscale surface convergence line.The weak vertical wind shear in the lower layer indicates that the convection is dominated by short-term strong precipitation.In radial velocity pictures,the northwest cold air inflow raises the lower warm moist air,increases precipitation efficiency,and triggers the formation of short-term strong precipitation.

关 键 词：春季暴雨 暖式切变线 地面辐合线 

分 类 号：P426.62[天文地球—大气科学及气象学]