雷电活动与WRF模式动力模拟量的对比研究  

Comparative Study on the Lightning Activities and Dynamical Quantities Simulated by the Weather Research and Forecasting Model

作　　者：翟丽 周筠珺 蒋大凯[2] 伍魏 李晓敏 

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]辽宁省气象灾害监测预警中心,辽宁沈阳110166 [3]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

出　　处：《成都信息工程大学学报》2017年第3期320-327,共8页Journal of Chengdu University of Information Technology

基　　金：四川省教育厅资助项目(16CZ0021);北京市自然科学基金重点资助项目(8141002);国家科技支撑计划资助项目(2015BAC03B05)

摘　　要：为研究雷电活动中动力因子与地闪的相关性,对京津冀地区发生的一次雷暴天气过程进行WRF(weather research and forecasting)模式模拟,计算获得雷电过程中动力特征量,与地闪实况资料对比分析得出动力因子与地闪的相关性。模拟结果表明:最大上升速度与地闪频数变化趋势一致,极值后20分钟会出现地闪频数的极值。风垂直切变的大值与地闪频数呈正相关,闪电中心位置随时间的演变与风切变最大值位置随时间的演变一致。风垂直切变的大值与正地闪分布趋势有一定的相关关系。WRF模式动力输出场对地闪发生的位置和时间有很好的提示作用,可用于对雷电天气的预报与研究。In order to study the relationship between dynamic output fields and cloud-to-ground（ CG）,a convective weather system was simulated by the WRF model,which is over the Beijing-Tianjin-Hebei region. The weather accompany with CG lightning flashes. Comparative analysis of the dynamic characteristic variables simulated by WRF and actual observation CG flashes were performed to obtain the correlation between them. The results showed that the maximum vertical velocity is related to the evolution trends of CG flash rate,the extreme flash frequency will occur 20 minutes after the extreme vertical velocity value. The large value of vertical wind shear is positively correlated with the frequency of CG lightning flash,and the evolution of the position of lightning center is consistent with the maximum of wind shear. The large value of vertical wind shear has a certain correspondence with the trend of positive flash. The simulation results suggest that the WRF mode dynamic characteristic variables can show the time and position of the flashes,and WRF model can be used for forecasting and researching thundery weather.

关 键 词：雷电物理学 大气物理学与大气环境 WRF模式 地闪 动力 上升气流 风切变 

分 类 号：P446[天文地球—大气科学及气象学]