雷达资料同化在甘肃局地暴雨天气个例中的应用  

Application of Doppler Radar Data Assimilation in a Local Rainstorm Case in Gansu Province

作　　者：王遂缠[1] 胡向军[1] 张新荣[1] 程鹏[1] 向军[2] 

机构地区：[1]兰州中心气象台/甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]甘肃省气象科技服务中心,甘肃兰州730020

出　　处：《高原气象》2011年第3期711-718,共8页Plateau Meteorology

基　　金：甘肃省气象局青年科技基金项目;甘肃省气象局高性能计算机项目"甘肃省中尺度数值预报系统的优化与改进";中国气象局区域中心能力建设项目共同资助

摘　　要：诊断分析了2006年7月27日发生在甘肃省的一次强对流局地暴雨天气个例,并利用Grapes模式及其变分同化系统,采用直接同化多普勒雷达风资料的方法,对该天气个例进行了有、无雷达资料同化的对比试验。结果表明,多普勒雷达资料在数值模式中的同化应用能明显提高模式系统对中小尺度天气系统的模拟效果,使细微的中小尺度系统特征表现的更为突出、合理;在加入雷达风资料同化后,降水区的风场辐合特征更为明显,风速也有一定增强,降水强度和中心更接近实际值。Based on the diagnosis analysis of a local rainstorm event in Gansu Province on 27 July 2006,using a series of comparative experiments by direct assimilation Doppler radar wind data method,the Grapes numerical model and its data assimilation system,the role of Doppler radar data assimilation in simulating the local rainstorm case is studied.The results show that the application of Doppler radar data assimilation in numerical model can obviously improve the ability of model to simulate the mesoscale and microscale weather systems,especially,it can make the fine characteristics of meso-and micro-scale weather systems more distinct and reasonable.And after joining Doppler radar wind data assimilation,wind field convergence characteristics in rainfall area is more apparent,wind speed also has certain enhancement,rainfall intensity and center closer to real values.

关 键 词：雷达资料同化 GRAPES模式 局地暴雨 

分 类 号：P458.121.1[天文地球—大气科学及气象学]