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一、引 言 最近一些年来,谱方法被广泛地用于全球原始方程模式的数值积分中。谱方法有许多优点。在理论上,它不会导致波动传播的延迟,这种方法能够很容易地采用非线性正交模初值化。但是,在谱方法中,物理过程作为积云对流或山脉作用的处理却不是简单的。为计算物理过程的作用,必须把物理量的谱表示变成网格值,当用许多波数的组合表示一个点源时,
I. INTRODUCTION Spectral methods have been widely used in the numerical integration of the global primitive equation model in recent years. Spectral methods have many advantages. In theory, it does not lead to the delay of wave propagation, this method can easily adopt the non-linear orthogonal mode initialisation. However, in the spectral method, the physical process as a cumulus convection or mountain effect is not simple. To calculate the effect of a physical process, the spectral representation of the physical quantities must be transformed into a grid value. When a point source is represented by a combination of wave numbers,