摘要
设计了IAP (InstituteofAtmosphericPhysics,ChineseAcademyofSciences)AGCM III,对其动力框架作说明和检验 ,时间积分采用改进的非线性迭代法。用Rossby Haurwitz波对框架进行了波型检验、能量检验和波速检验。结果表明 ,非线性迭代 3次的时间积分方案具有较好的稳定性 ,能够有效地抑制短波 ,同时对长波的歪曲较小 ,且时间积分步长可放得较大 ;该框架能够较长时间地保持Rossby Haurwitz 4波波型 ,在积分过程中能够较高精度地保持总有效能量守恒 ;模式计算的Rossby Haurwitz波速为每天西传 1 5个经度 ,这与理伦值很接近。
The dynamical framework of IAP AGCM-III is designed here and this paper gives the description and testing on such framework. An improved nonlinear iterative time integration scheme is adopted and furthermore, by using Rossby-Haurwitz wave, some testing of wave pattern, energy and wave speed is performed on the dynamical framework. It shows that the nonlinear integration scheme iterating 3 times has the better compute stability and effectively restrains short wave while preserves long wave. With such integrative scheme, time step can be greatly enlarged. During the integration, the dynamical framework can preserve the Rossby-Haurwitz 4 wave pattern for a relative long period and keep available energy conservation in a higher precision. Rossby-Haurwitz wave speed calculated from the model is 15 degrees westward per day and is similar to the theoretical value.
出处
《大气科学》
CSCD
北大核心
2004年第5期659-674,共16页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目 40 2 3 3 0 2 7
国家重点基础研究发展规划项目G1 9980 40 90 0共同资助
关键词
大气环流模式
IAP
动力框架
非线性迭代时间积分方案
general circulation model
dynamical framework
nonlinear iterative time integration scheme
