积云对流参数化方案对梅雨锋暴雨过程模拟的影响  

Impact of Cumulus Parameterization Schemes on Simulation of a Meiyu Front Rainstorm Process

作　　者：侯瑞钦[1] 程麟生[2] 

机构地区：[1]河北省气象台,石家庄050021 [2]兰州大学大气科学学院,兰州730000

出　　处：《气象科技》2007年第4期458-463,共6页Meteorological Science and Technology

摘　　要：利用MM5模式,选用4种积云对流参数化方案对2002年7月长江流域梅雨锋暴雨过程进行数值试验,讨论了同一水平分辨率下不同参数化方案对降水特征、中尺度特征和云物理特征模拟的影响。结果表明:不同方案对强降水中心落区影响不是很大,但对降水强度有较大影响;4种方案次网格尺度和网格尺度降水对总降水贡献不同;GR和KF方案的闭合假设中考虑次网格尺度湿下沉气流,可一定程度再现一些中尺度特征;4种方案模拟的云物理量特征存在很大差别。Numerical experiments on four cumulus parameterization schemes （CPSs） are carried out using the data of a Meiyu heavy rainstorm event occurred over the Changjiang basin in July 2002 with MM5 model. The impacts of different CPSs under the same model horizontal resolutions on rainfall, the meso-scale feature, and the microphysics feature of clouds are discussed. The results indicated that different CPSs have significantly different effects on rainfall intensity, but a little on the location of the rainfall center. The contributions to the total precipitation of four schemes are obviously different. The GR and KF schemes, which include subgrid scale moist downdrafts, are able to reproduce meso-α-scale vortex features. The simulated cloud physical characteristics using four CPSs show significant difference.

关 键 词：梅雨锋暴雨 MM5模式 积云对流参数化方案 

分 类 号：P43[天文地球—大气科学及气象学]