一次四川盆地雷暴天气的数值模拟分析  

Numerical Simulation Study of Thunderstorms in Sichuan based on WRF Model

作　　者：钱鑫铭 周筠珺 赵鹏国[1] 刘恒 李思盟 QIAN Xinming;ZHOU Yunjun;ZHAO Pengguo;LIU Heng;LI Simeng(College of Atmosphere Sciences,PlateauAtmosphere and Environment,Key Laboratory of Sichuan Province,Chengdu University of Information Technology,Chengdu 610225,China;Meteorological Disaster Warning and Evaluating the Collaborative Innovation Center,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiyuan Meteorological Bureau,jiyuan 154000,China)

机构地区：[1]成都信息工程大学大气科学学院,高原大气与环境四川省重点实验室,四川成都610225 [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]济源市气象局,河南济源454000

出　　处：《成都信息工程大学学报》2019年第5期532-542,共11页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(41875169);四川省教育厅科研资助项目(17ZB0087)

摘　　要：为更好地利用WRF中尺度模式进行雷电活动数值预报,在WRF模式Morrison双参数微物理方案中引入起电放电参数化方案,基于此模式对2010年8月18日发生在四川地区的强雷暴天气过程进行模拟。模式输出的闪电空间分布与观测的闪电分布接近,结果表明:对流有效位能值与风暴相对螺旋度、位涡可以指示地闪频数随时间变化,且空间上均可指示地闪密度大值中心。电荷分离区域内,霰粒子质量混和比最大值与地闪频数随时间变化趋势基本保持一致。空间分布上,霰、冰晶及雪粒子最大值位置与地闪密度大值中心位置对应性较好,均能指示地闪发生区域,霰粒子、冰晶粒子和雪粒子的垂直分布达16 km以上。模拟研究表明针对该电耦合模式微物理及动力输出场分析可以有效预测地闪活动的发生时间和位置,具有一定的预警预报作用。In order to use the WRF mesoscale model for numerical prediction of lightning activity,the processes of cloud electrification and lightning parameterization are introduced into the Morrison cloud-scale double-moment microphysical scheme in the WRF model.The strong thunderstorm weather process that occurred in Sichuan on August 18 of 2010 was simulated.The results show that the lightning distribution of the mode output is close to the observed lightning distribution.The CAPE value,Storm Relative Helicity,potential vorticity of the storm and the potential vortex can indicate that the ground flash frequency changes with time,and the center of the large flash density.In the charge separation region,the mixing ratio of hydrometeor and the frequency of stroboscopic flash are basically consistent with time.In the spatial distribution,the maximum position of graupel,ice and snow have a good correspondence with the center position of large flash density,which can indicate the area where observed CG flashes by ADTD occurs.The vertical distribution of graupelparticles,ice and snow is more than 16 km.The simulation results show that the mode microphysical and power output fields can indicate the occurrence time and location of the ground flash activity.

关 键 词：WRF模式 雷暴云 闪电活动 水成物粒子 微物理特征 

分 类 号：P427.32[天文地球—大气科学及气象学]