2016年7月18～22日华北暴雨天气过程分析  

Analysis of Heavy Rainstorm in North China During 18-22 July 2016

作　　者：龚克坚 姚素香[2] Gong Kejian;Yao Suxiang(Meteorological Observatory of Ningxia Civil Aviation ATC,Ningxia,Gansu,750009,China;Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science&Technology,Nanjing,Jiangsu,210044,China)

机构地区：[1]民航宁夏空管分局气象台,宁夏银川750009 [2]南京信息工程大学气象灾害教育部重点实验室,江苏南京210044

出　　处：《绿色科技》2018年第24期123-124,127,共3页Journal of Green Science and Technology

基　　金：国家重点基础研究发展计划(973计划)(编号:2015CB453200)

摘　　要：利用观测资料和ERA-interim逐六小时再分析资料,分析了2016年7月18～22日华北地区一次暴雨过程。结果表明:在此次降水过程中,高纬度为阻塞高压控制,贝加尔湖地区为广阔的低槽区,低纬度西北太平洋副热带高压稳定,为暴雨的发生提供了较为稳定的背景场;高原槽活动频繁,中纬度短波槽迅速发展,并在20日形成华北冷涡;西南涡18日在500hPa高原槽前生成后沿着切变线向东北方向移动,在西南涡和切变线南侧是强烈的西南风急流,三者共同作用使得上升运动强盛,同时西南风急流源源不断输送水汽使得持续暴雨发生;对流层中上层的冷涡和低层的暖湿气流增加了对流性不稳定,使得暴雨强度增强。Based on observations and ERA-interim reanalysis 6-hourly data,a heavy rain event in North China from July 18 to 22,2016 was analyzed. The results show that the high latitude was controlled by blocking high and the Baikal Lake area was controlled by a wide trough. In the low latitude,subtropical high stability provided a relatively stable background field for the occurrence of rainstorms. The activities of the plateau trough were frequent;the short wave trough in the middle latitude developed rapidly,and the cold vortex in North China formed on the July 20. On July 18,the southwest vortex formed in front of the trough over 500 hPa and moved northeastward along the shear line. On the south side of the shear line,there was a strong southwesterly jet,which made the ascending motion strong. At the same time,the southwest wind jet continued to transport water vapor,resulting in persistent rainstorms. The cold vortex in the upper and middle troposphere and the warm and humid airflow in the lower layer increased the instability and increased the intensity of the storm.

关 键 词：暴雨 西南涡 低空急流 华北冷涡 

分 类 号：P458[天文地球—大气科学及气象学]