二十面体网格和经纬网格全球模式在中国区域模拟效果对比

Global mode simulation results comparison between icosahedron spherical mesh and latitude-longitude mesh in China

为了评估二十面体网格全球模式MPAS和经纬网格全球模式WRF在中国区域的模拟效果,对比了两模式对2010年10月23—28日中国区域的涡度场、降水场、高度场和温度场的模拟效果,结果表明:在30和60 km准均匀模拟下,MPAS和WRF模式对中国区域500 h Pa高度处涡度场的模拟效果都比较好,但都难以模拟出局地的涡度极值中心,两模式模拟效果相当;从第3天的日累积降水的模拟结果来看,两模式基本都能模拟出降水分布情况,MPAS模式模拟结果整体要优于WRF,WRF对降水中心的模拟要优于MPAS;MPAS对高层高度场和温度场的模拟较好,WRF对中、低层的模拟较好,且WRF的预报时效性比MPAS长;网格分辨率的提高对MPAS模式模拟效果的改善不大,而WRF模式的模拟效果得到了提高.

To assess the simulation effects of MPAS with icosahedral mesh and WRF with latitude？longitude mesh in global modes, thesimulated vorticity, precipitation, height and temperature from thesetwo models in China from October 23,2010 to October 28,2010 were compared.Results show that both the MPAS and WRF simulate the vor？ticity at 500 hPa with good effects under 30 km and 60 km resolutions,yet none of them can accuratelysimulatethe extreme value centers of vorticity.From the simulation results of the accumulated precipitation at the 4th day,both the MPAS and WRF can simulate the rainfall distribution,and MPAS is superior to WRF in general simulation re？sult,while WRF is superior to MPAS in precipitation value centers simulation.MPAS works well for height and tem？perature fields at upper level;while WRF is good for those at middle and low level,and long in forecast validity pe？riod than MPAS.The increase of mesh resolution improves the simulation effect of WRF,and affects little on MPAS simulation.