日本东京工业大学教授肖锋教授学术报告会

报告题目：A multi-moment constrined multi-scale weather-climate model for atmosphere

报告时间：2023年4月24日 16:00-17:30

报告地点：云南大学呈贡校区力行楼1205

报告摘要：A multi-scale weather-climate integrated model has been developed in CMA (China Meteorological Administration). The nonhydrostatic dynamical core has been based on the multi-moment finite volume method that ensures the rigorous numerical conservation. To represent the spherical geometry free of polar problems, the cubed-sphere grid is adopted. A fourth-order multi-moment discretization formulation is applied to solve the governing equations cast in the local curvilinear coordinates on each patch of cubed sphere through a gnomonic projection. In vertical direction, the height-based terrain-following grid is used to represent the topography and a conservative finite difference scheme is used for the spatial discretization. The dynamical core adopts the nonhydrostatic governing equations. To get around the CFL stability restriction of the explicit scheme imposed by sound wave and relatively small grid spacing in the vertical direction, the dimensional-splitting time integration algorithm using the HEVI (Horizontal-Explicit and Vertical-Implicit) strategy is implemented by applying the IMEX Runge-Kutta method in the proposed model.

The model was evaluated by the widely-used benchmark tests. The numerical results show the superior solution quality and great practical potential as a numerical platform for development of the atmospheric general circulation models. Recently, tremendous works in the Numerical Weather Prediction Centre (CMA), and their cooperators have made striking progress in model developments. The comparisons of various weather predictions for real cases as well as climate projections reveal the model as a competitive one among the most promising model in the world.