一次雹暴过程的三维数值模拟  

Three-Dimensional Numerical Simulation of A Hailstorm

作　　者：吴彬[1] 陈钟荣[1] 张晶晶 纪雷[1] 

机构地区：[1]南京信息工程大学大气物理学院,江苏南京210044 [2]九江市气象局,江西九江332000

出　　处：《安徽农业科学》2010年第17期9077-9082,共6页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金项目(40275010)资助

摘　　要：利用中国科学院大气物理研究所建立的完全弹性三维雹云数值模式,模拟了2007年7月25日发生在南京市六合县的一次强雹暴过程,分析了风暴的气流场、雷达回波结构、涡度场和含水量等宏观微物理的分布及其演变。通过将模拟结果与多普勒雷达资料进行对比发现,模拟的雷达回波强度及回波顶高与雷达观测资料基本一致。模拟结果表明,在雹云强盛时期,近地面层是以辐散气流为主,中上层是以辐合上升气流为主,气流在顶端转变方向,形成辐散出流;模拟的高含水量中心,对应着雷达回波图上的强回波中心,出现在上升气流最大区附近,动力场与物质场配合得较好。The fully elastic three-dimensional convective storm model developed by the Institute of Atmospheric（IAP）,was used to simulate the strong hailstorm that occurred in the Luhe county of Nanjing on July 25,2007.The distribution and evolution of macro-physical as well as micro-physical including wind vectors field,radar echo structure,vorticity field and water content in the hailstorm were analyzed.The simulated radar reflectivity and the height of the echo top were coincided with the radar observed results.During the strong period of the hailstorm,the surface layer flow divergence in the middle and high layer,convergent uplift was dominant and the airflow changed the direction at the top,forming plume.The simulated core of the hailstorm high water content relative to the core of radar reflectivity,lies in the maximum updraft area,which show that dynamic field agreed well with the material field.

关 键 词：冰雹云 数值模拟 流场 雷达回波强度 涡度 含水量 

分 类 号：P426.64[天文地球—大气科学及气象学]