双多普勒雷达观测在一次雹云结构中的应用  

Application of dual Doppler radar in observing a hail cloud structure

作　　者：王子昕 王咏青[2,3] 胡志群 徐芬[5] WANG Zixin;WANG Yongqing;HU Zhiqun;XU Fen(Jiangsu Meteorological Service Centre,Nanjing 210041,China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disasters,Ministry of Education/School of Atmospheric Sciences,Nanjing University of Information Science&Technology,Nanjing 210044;Nanjing Joint Center of Atmospheric Research,Nanjing 210041;State Key Lab of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China;Nanjing Joint Institute for Atmospheric Sciences,Nanjing 210041,China)

机构地区：[1]江苏省气象服务中心,南京210041 [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/气象灾害教育部重点实验室/大气科学学院,南京210044 [3]南京大气科学联合研究中心,南京210041 [4]中国气象科学研究院灾害天气国家重点实验室,北京100081 [5]南京气象科技创新研究院,南京210041

出　　处：《气象科学》2023年第2期225-234,共10页Journal of the Meteorological Sciences

基　　金：广东省重点领域研发计划项目(2020B1111200001);国家重点研发计划项目(2018YFC1506103);国家自然科学基金资助项目(41875070);北极阁开放研究基金-南京大气科学联合研究中心(NJCAR2018MS02)。

摘　　要：利用常州站和泰州站双多普勒天气雷达探测数据,结合常规观测资料和ERA5再分析资料,综合分析了2019年7月6日一次强对流天气过程的天气形势、雷达回波强度演变特征和双多普勒雷达反演的三维流场信息。重点利用双多普勒雷达径向速度资料反演出格点流场,并结合回波特征分析雹云的结构。结果表明:强对流天气过程中,江苏受高空冷涡影响,在高空冷槽、高空急流、低层切变线和地面辐合线的配置条件下,形成了上干冷、下暖湿的层结不稳定结构。本次过程中,雹云不仅具有典型的强对流单体雷达回波特征,在中层强回波中心处,还有明显的“S”型水平流场结构。雹云的低层,是明显的辐合与旋转配置的水平流场。深厚的零线结构是成雹的典型特征。Using the detection data of dual Doppler weather radar(Changzhou and Taizhou station),combined with the conventional observation data and the ERA5 reanalysis data,this study comprehensively analyzes the synoptic situation,the evolution characteristics of reflectivity and the 3D flow field information retrieved by dual Doppler radar during a severe convective weather process on July 6,2019.The structure of the hail cloud is analyzed based on the grid point flow field retrieved from the radial velocity data of the dual Doppler radar and combining with the reflectivity characteristics.The results shows that in the process of severe convective weather,Jiangsu Province is affected by the high-altitude cold vortex.Under the conditions of high-altitude cold troughs,high-altitude jet stream,low-level shear lines and ground convergence lines,an unstable stratification with upper dry cooling and lower part warm and humid has been formed.During this weather process,the hail cloud not only has the typical radar reflectivity characteristics of strong convection monomer,but also has the obvious S-shaped horizontal flow field structure at the strong echo center in the middle layer of the hail cloud.The lower layer of the hail cloud has a horizontal flow field with obvious convergence and rotating configuration.The deep zero line structure is a typical characteristic of hail formation.

关 键 词：雹云 S型流场双多普勒雷达 风场反演 零线 

分 类 号：P412.25[天文地球—大气科学及气象学]