非静力AREM模式设计及其数值模拟II：数值模拟试验

The design of non-hydrostatic core for Advanced Regional Eta-coordinate Model (AREM) has been presented in Cheng et al. (2018). The non-hydrostatic AREM is tested through the idealized and real-data numerical experiments in the present part. Firstly, the authors carry out high resolution idealized simulation (about 1 km) and compare the non-hydrostatic core of AREM with advanced non-hydrostatic frames, which are commonly used for research and operational forecasting. It can be seen that non-hydrostatic cores of AREM, Advanced Regional Prediction System (ARPS) and Weather Research and Forecasting Model (WRF) yield similar structural and evolutional features of convection, which basically proves the soundness and validity of the non-hydrostatic dynamic core of AREM. In association with the existing initialization techniques and physical packages of current hydrostatic model, non-hydrostatic AREM has the capability of real-data simulation. The typhoon Rananim (2004) is then simulated using this non- hydrostatic model and results are verified against various observations. The results reveal that the non-hydrostatic AREM can reproduce the hydrostatic simulation at lower resolution (for example, 37 km) and it can outperform the hydrostatic version of AREM at finer resolution (for instance, 8 km). Finally, the non-hydrostatic version of AREM is evaluated through quantitative testing on the precipitation hindcasting in July of 2010.