P-σ坐标系区域气候模式与GCM的嵌套试验  

The Tests of a P－σ Hybrid Coordinate Regional Climate Model Nested into a GCM

作　　者：刘华强[1] 钱永甫[2] 郑益群[2] 

机构地区：[1]南京气象学院 气象灾害与环境变化开放实验室,江苏南京210044 [2]南京大学 大气科学系,江苏南京210093

出　　处：《高原气象》2002年第2期113-118,共6页Plateau Meteorology

基　　金：国家自然科学基金重点项目"中国区域气候变化分析和机理研究"(49735170)资助

摘　　要：将Ｐ－σ坐标系区域气候模式与大气环流模式（ＧＣＭ）单向嵌套，　对我国１９９８年夏季长江流域严重洪涝进行模拟试验，　并与ＧＣＭ的模拟结果进行了比较。试验表明，　嵌套的区域气候模式对降水场的模拟结果较ＧＣＭ的结果有明显的改进，　这是由于Ｐ－σ坐标系区域气候模式能够更真实地描述地形的动力和热力作用，　因而能更准确地模拟青藏高原及其邻近地区的气压系统，　在一定程度上弥补了低分辨率的ＧＣＭ模拟在高原地区的不足。文中指出，　与ＧＣＭ嵌套的区域气候模式比ＧＣＭ能够更有效地模拟区域气候的变化，　尤其是对区域气候性特征比较明显的地区。The regional climate model with P－σ incorporated coordinate is nested into a general circulation model (GCM) to simulated the severe flooding occurred over Yangtze River valley in China during the summer of 1998, and the simulated results from this one－way nested regional climate model are compared with those from the GCM. The tests indicate that the nested regional climate model has better performances than the GCM in precipitation simulation. This is mainly because the regional climate model can more realistically describe the effects of topographic dynamic and thermodynamic and so can more accurately simulate the pressure systems over and near Qinghai－Xizang Plateau than the GCM does. It is pointed out that the nested regional climate model with GCM is more effective than GCM to simulated and predict the regional climate changes, especially in those regions with obvious regional features of climate.

关 键 词：P-σ坐标系 区域气候模式 大气环流模式 地形 GCM 

分 类 号：P463.1[天文地球—大气科学及气象学]