中尺度WRF数值模式系统本地化业务试验  

Localization of Operational Experiment on the WRF Mesoscale Numerical Modeling System

作　　者：段旭[1] 王曼[1] 陈新梅[1] 刘建宇[1] 符睿[1] 

机构地区：[1]云南省气象科学研究所,昆明650034

出　　处：《气象》2011年第1期39-47,共9页Meteorological Monthly

基　　金：云南省科技攻关及高新技术计划(2006SG25);云南省应用基础研究面上项目(2009CD145)共同资助

摘　　要：利用中尺度WRF数值模式及WRF三维变分同化系统,在对比试验的基础上,选取了适合本地的积云过程、微物理过程和辐射过程的方案组合;选择了NCEP/GFS作为模式的背景场;统计计算了以云南为中心的区域背景误差协方差并替换了三维变分同化系统中原有的背景误差协方差;同时,考虑模式底层高度与地面观测站高度的差异,进行了地面资料地形订正。通过上述试验研究,建立了本地化的中尺度WRF数值预报业务系统,该系统能较好地刻画本地下垫面的动力和热力状况,预报能力有明显改善。Using the WRF mesoscale numerical model and WRF three-dimensional variational data assimilation （3D-Var）,a combined scheme of cumulus process,micro-physical processes and radiation processes for local area is selected based on comparison experiments and the NCEP/GFS data are chosen as background field of the model;the background error covariance over the region centered in Yunnan is computed statistically and replaces the primary background error covariance in 3D-Var;At the same time,considering the elevation difference between model bottom layer and surface observing station,the topography in surface data is corrected.Through the above study the localized WRF mesoscale numerical forecast system has been established,which could be better to characterize the dynamic and thermodynamic conditions in the local underlying surface,and has a significant improvement in forecast capability.

关 键 词：WRF模式 本地化 业务试验 参数化方案 三维变分同化 

分 类 号：P456.7[天文地球—大气科学及气象学]