| 解决格点大气环流模式极点问题的一种方法 |
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| 作者姓名： | 史湘军 王斌 季仲贞 |
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| 作者单位： | 中国科学院大气物理研究所LASG,北京 100029 |
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| 基金项目： | 国家"973"项目(200SCB321703)、中国科学院"十一五"信息化专项(INFO-115-B01)和中国科学院知识创新工程重要方向项目(KZCX2-YW-Q11-04)资助 |
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| 摘 要： | 以球面正压浅水方程显式能量守恒格式的设计为例,在不失动力学方程物理意义的情况下,给出南北极网格点上速度的表达式,以及其预报方程的差分格式.克服数学意义上的极点奇异问题,直接预报极点速度.数值试验表明,此方法简单易行,能合理描述极点速度及其变化.
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| 关 键 词： | 大气模式 极点 奇点 |
| 收稿时间： | 2009-03-06 |
| 修稿时间： | 2009-09-09 |
An approach to the solution of polar singularity problem in grid-point atmospheric model |
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| Authors: | SHI Xiang-Jun WANG Bin JI Zhong-Zhen |
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| Institution: | LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | There are two singularities in atmospheric governing equations under spherical coordinate system, and hence, velocity at the north and south poles can not be defined and predicted directly by grid-point atmospheric model. To solve this problem, a simple approach is presented, and an explicit square conservation scheme in A-grid for shallow water model is chosen as an example. The new approach defines pole velocity and sets up a difference equation. The new model can predict pole velocity directly, and the numerical experiment shows that the results are reasonable. |
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| Keywords: | atmospheric mode pole singularity |
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