机构地区: 中国科学院大气物理研究所
出 处: 《中国科学院研究生院学报》 2010年第1期127-132,共6页
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. 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.
领 域: [天文地球]