冀南平原“7·27”局地大暴雨中尺度特征分析  

Mesoscalc Characlcrislics of a Local Rainslorm on July 27 in the Soulhern llebci Plain

作　　者：耿飞 霍朝阳 魏鸣 刘笑 GENG Fei;HUO Zhaoyang;WEI Ming;LIU Xiao(State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;Xingtai Meteorological Bureau,Xingtai 054000,China)

机构地区：[1]中国气象科学研究院灾害天气国家重点实验室,北京100081 [2]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏南京210044 [3]邢台市气象局,河北邢台054000

出　　处：《沙漠与绿洲气象》2024年第1期105-111,共7页Desert and Oasis Meteorology

基　　金：中国气象科学研究院科技发展基金项目(2023KJ037);国家自然科学基金(41675029);河北省自然科学基金项目(D2020108049)。

摘　　要：利用FY-4A气象卫星及天气雷达遥感产品,并借助地面及探空资料,对2019年7月27日冀南平原一次局地大暴雨过程进行中尺度时空演化特征分析。结果表明,本次过程是在副热带高压外围,受高空槽以及低层切变线影响生成的局地大暴雨天气。降水系统内的对流组织主要经历了“新生发展—合并加强—降水维持—移出消散”的演化过程。本次冀南平原地区大暴雨的成因主要包括:两个初期发展的对流系统的合并加强,前期外围对流活动提供了充沛的水汽环境,强对流系统形成了低层旋转辐合、高层辐散的中尺度垂直环流结构,中低层辐合中心空间位置基本一致,有利于水汽供应并维持云中液滴的高效增长。研究结果对冀南平原局地强降水的临近预报预警提供了科学依据。In order to improve the understanding of the evolution of a short duration local rainstorm system and explore the characteristics and causes of short-time rainstorm,the mesoscale spatiotemporal evolution characteristics of a local heavy rainstorm on July 27,2019,in the southern Hebei plain were analyzed by using the observation from FY-4A meteorological satellite,weather radar remote sensing products,ground-based and sounding data.The results show that this process is a local heavy rainstorm generated by the upper-altitude trough and the low-level shear line on the periphery of the subtropical high.The convective organization in the rainstorm system shows an evolutionary process of“new development,merging and strengthening,maintenance,migration,and dissipation.”The main causes of the heavy rainstorm in the southern Hebei plain include:Merging and strengthening of two early developing convective systems,the early stage of the peripheral convection provides an abundant water vapor environment,middle mesoscale vertical circulation structure with strong rotating and strong convergence in the lower and middle atmosphere;The convergence center in each layer space position is advantageous to the water supply and maintain efficient growth of the raindrop.The results provide a scientific reference for the near forecast and early warning of short-term severe convective weather in the southern Hebei plain.

关 键 词：冀南平原 短时暴雨 中尺度 对流演化 

分 类 号：P458.2[天文地球—大气科学及气象学]