摘要
在区域气候模式模拟中，侧边界的作用是引入大尺度强迫场。如何处理好侧边界，即大尺度强迫场和区域气候模式本身之间的关系问题，对于区域气候模式模拟和预报东亚夏季风降水具有重要意义。本文利用美国纽约州立大学Ａｌｂａｎｙ分校的区域气候模式（ＳＵＮＹＡ－ＲｅＣＭ），设计了两种不同的侧边界处理方法，来探讨侧边界对东亚夏季风降水模拟的影响。驱动区域模式的大尺度强迫场来自欧洲中期天气预报中心（ＥＣＭＷＦ）及热带海洋大气研究计划（ＴＯＧＡ）的分析资料场。试验结果表明：（１）当模式的区域较大时，采用较小的侧边界缓冲区会在缓冲区与模式内部的交界处产生不连续；扩大缓冲区并且考虑不同尺度强迫在垂直方向上的不同作用，可以避免这一缺陷。（２）更重要的是采用后一种方案，即减少了区域气候模式在模拟大尺度环流场方面所起的作用，使得模式更多地依赖侧边界来得到更真实的、对东亚夏季风降水起重大影响的一些气流，如副高、西南季风和南海季风，对东亚夏季风降水无论是在大小上还是在雨带位置的演变上都能进行更好的模拟。
In this paper two different lateral boundary treatments have been designed to study the effect of lateral boundary on the East Asian summer monsoon rainfall with SUNYA-ReCM. It is found: (1) when the lateral boundary buffer zone is too small compared with relatively large model domain, there exists a somewhat discontinuous behaviour at the edge of the buffer zone. (2) An even wider buffer zone with considering the different influences of various scale forcing in the vertical can obtain even smoother transition from boundary to model regime, moreover, because this method reduces the role of regional climate model on large-scale fields simulation, regional climate model can get more realistic factors which have significant effects on the East Asian summer monsoon rainfall, such as southwest monsoon, South China Sea monsoon and subtropic high, and then get a better simulation of summer monsoon precipitation both in quantity and in the sudden jump of rainfall belt.
出处
《大气科学》
CSCD
北大核心
1998年第5期779-790,共12页
Chinese Journal of Atmospheric Sciences
关键词
侧边界
区域气候模式
东亚夏季风
降水
季风
lateral boundary regional climate model East Asian summer monsoon rainfallPPENGSS Effects of the Thermal Forcing on Nonlinear Internal Inertia Gravitational Waves in the Atmosphere$$$$ Li Guoping Yang Xiaoyi (Chengdu Institute o
