分块地形坐标大气环流模式框架的计算稳定性及数值试验  

A Computational Stability Analysis and Numerical Experiments on the Dynamic Framework of the Atmospheric General Circulation Model in the Partition Terrain Coordinate

作　　者：梁丹青[1] 张铭[2] 曾庆存[3] 

机构地区：[1]空军装备研究院航空气象研究所,北京100085 [2]解放军理工大学气象学院,南京211101 [3]中国科学院大气物理研究所,北京100029

出　　处：《大气科学》2005年第3期354-362,共9页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金重点资助项目40233027;国家重点基础研究发展规划项目G1998040900

摘　　要：用数值试验方法讨论了分块地形η坐标大气环流模式动力框架的计算稳定性;采用实际初始场,该框架能够长期稳定地积分。在积分前100d内总有效能量变化很小,总质量守恒、各物理量场的数值和波形都得到很好保持,这表明该框架稳定性好。在分析了该框架的积分结果后可知其合乎物理事实,与IAP2.0的动力框架相比,能更好地反映出大地形的环流形势,这说明有大地形时采用分块地形η坐标要较σ坐标好。另外,还对青藏高原等大地形的纯机械强迫作了数值试验,得到了地形强迫平均槽脊的分布特征,给出了地形纯机械强迫造成的准定常行星波的图像。这些工作表明采用分块地形η坐标处理大地形是合理可行的。The computational stability on the dynamic framework of the Atmospheric General Circulation Model (AGCM) in the partition terrain η coordinate is discussed with numerical experiments. It is found that the framework can be run stably for a long time using the real initial field. The change of the total effective energy within 100 days is very small and the total mass is conservative. The magnitude and wave pattern of physical quantity are kept well. It is shown that the framework has better stability. After analyzing the integration results of the framework, it is known that the results agree with physical reality. Compared with the result of IAP 2.0 model, the framework can well represent the general circulation over the high terrain. It also shows that using the partition terrain η coordinate is better than using σ coordinate over the high terrain. The numerical experiments are also carried out on the forced action of the high terrain in the Tibetan Plateau etc. The distribution characteristics on the average trough and ridge of the terrain force are gained. The actions which the pure mechanical force forms quasi\|permanent planetary wave are studied. These works also show that it is proper and feasible to deal with the high terrain using the partition terrain coordinate

关 键 词：大气环流模式 分块地形坐标 稳定性 数值试验 地形纯机械强迫 

分 类 号：P434[天文地球—大气科学及气象学] P435.2