一个有限区变网格模式的设计  

Design of a Limited-Area Forecast Model with Variable Resolution

作　　者：钱滔滔[1] 郭肖容[1] 廖洞贤[2] 

机构地区：[1]国家气象中心 [2]南京气象学院

出　　处：《大气科学》1997年第6期687-697,共11页Chinese Journal of Atmospheric Sciences

摘　　要：在国家气象中心业务运行的有限区球面均匀网格模式的基础上设计了一个有限区变网格模式。使预报的窗口区设计为均匀细网格０．５°，而窗口区以外则以０．１°经纬度均匀向外递增。采用廖洞贤１９９５年提出的坐标变换方法，变网格中的模式方程可以在相应的均匀网格上进行计算。利用实际资料对绝热模式进行了变网格与全场均匀细网格０．５°的对比试验。３个个例的试验结果表明：对窗口区变网格模式预报几乎与全场均匀细网格模式预报水平相当。但由于窗口区外网格点数减少而所用计算机时（ＣＰＵ）节省了一半以上。Based on the operational limited-area model with uniform grid interval on sphere in National Meteorological Center (NMC), a limited-area model with variable resolution is designed. In the model the window part is a fine grid with uniform grid interval of 0.5°, but in the part outward the grid interval gradually increases by 0.1°. According to the coordinate-transforming method suggested by Liao Dongxian in 1995, the computations of model equations with variable resolution are all performed in the corresponding computational grid in which all grid intervals are uniform. A comparison is about two adiabatic numerical tests based on real data by the model with variable resolution and the limited-area model with uniform grid interval of 0.5°. The results show that in the window part, the accuracy of forecast with variable resolution model is no less than the fine grid model (0.5°), and its CPU time is saved more than half as the number of grid points is decreased outward the window part.

关 键 词：有限区 变网格模式 天气预报 数值预报 CPU时间 

分 类 号：P456.7[天文地球—大气科学及气象学]