Development of Nonhydrostatic numerical model : I. Basic framework

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Accurate and multi-purpose nonhydrostatic numerical model systems will be very important infrastructures for the next generation of meteorology. The project aimed to establish the research community to develop the nonhydrostatic model system. For this purpose, we(1) promoted meteorological researches based on nonhydrostatic numerical model,(2) developed dynamical core of nonhydrostatic numerical models and(3) developed parameterization schemes for nonhydrostatic numerical models.The standard model, MRI/JMA nonhydrostatic model, was distributed to many scientists. Now, we are making the user's guide of this model. We reviewed the current status and future perspectives of nonhydrostatic models to cultivate this field and held workshop to exchange information every year.Simulation of flows associated with steep mountains is an important subject for nonhydrostatic model. We proposed standard experiments of mountain waves for intercomparison among models. This was very helpful for validation of model dynamical core and its improvement.There were several activities of development of physics parameterization scheme. We developed a procedure of cloud-resolving model to study parameterization schemes. Among them, we made research on cloud radiation -cloud formation feed back. The low-resolution model showed erroneously large feedback without considering subgrid-scale inhomogeneity. Also, we have improved a parameterization scheme for boundary layer and initialization procedures for heavy precipitation.