Background



The RSM is a limited area atmospheric numerical model system, which is used primarily for daily weather forecasts, and climate simulation or forecasts. The initial motivation is from the authors' experiments with a limited-area grid-point model. Since spectral computation has higher accuracy in term of gradients and spectral interpolation. We switched from grid-point model to spectral model. The difficulty to do limited area model with spectral method is overcome by the time-dependent perturbation method. The extension of this perturbation method is used to step into the non-hydrostatic model from the existed hydrostatic model. Thus current version has hydrostatic and non-hydrostatic version of RSM. For simplicity and convenience, the hydrostatic version we call it RSM as usual and the non-hydrostatic version is called MSM (meso-scale spectral model).


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