二十面体和经纬网格模式在正压情况下的模拟效果对比分析

摘要

In order to comparatively analyze the simulation performance of the models with icosahedron mesh and latitude-longitude mesh,the Model for Prediction Across Scales (MPAS) and PKU_SWM are used to simulate Cosine bell and Ross-by-Haurwitz wave.Results show that the MPAS can better simulate the basic state of Cosine bell under low resolution,but the absolute errors of the simulated results are bigger.The simulation effects are improved more obviously with the resolution improvement.From the results of Rossby-Haurwitz wave test,the simulated location and intensity of the trough-ridge from MPAS are much closer to the actual cases,but from PKU_SWM they are more westerly and stronger.On the whole,the simulation effects of MPAS are better than the PKU_SWM.Besides,the results of the two models are greatly improved with the resolution improvement.%利用MPAS(Model for Prediction Across Scales)和北京大学浅水模式(PKU_SWM)对余弦钟和Rossby-Haurwitz波理想个例进行了模拟.结果表明:在余弦钟测试中,MPAS能更好的模拟出余弦钟的基本形态,但模拟结果的绝对误差较大;网格分辨率提高后,MPAS模拟效果提升得更明显.在Rossby-Haurwitz波测试中,MPAS模拟的槽脊位置和强度更加接近于初始分布形态,PKU_SWM模拟的槽脊的强度偏强,位置偏西,MPAS模拟效果整体要优于PKU_SWM;网格分辨率提高后,两模式模拟效果都有较大的提升.