WRF模式不同参数化方案对石羊河流域降水模拟的影响

Influence on Precipitation Simulation by Using Different of Parameterization Schemes in WRF Model in Shiyang River Basin

为深入研究石羊河流域降水过程,选择适用于该地区的最优参数化方案组合,利用WRF3.9对石羊河流域一次降水过程进行模拟,并基于均方根误差、平均绝对误差、相关系数及降水空间分布对比分析了不同微物理、陆面过程、积云对流、行星边界层方案组合对降水模拟的影响。结果表明,不同物理过程对降水的影响各异,以微物理、陆面过程、积云对流过程最为显著,行星边界层方案的影响相对较小,但不可或缺,MRF边界层方案模拟效果较好。其中微物理、陆面过程、行星边界层、积云对流参数化方案组合为(WSM5、Noah、MRF、Grell-Devenyi)时能为石羊河流域降水模拟提供较优结果。

In order to study the precipitation process of Shiyang River Basin and select the optimal parameterization scheme suitable for this area,a precipitation process was simulated by WRF3.9.Based on the root-mean-square error,mean absolute error,correlation coefficient and precipitation spatial distribution,the influences of different cloud microphysics,land surface process,cumulus convection and boundary layer scheme combinations on precipitation simulation were analyzed.The results show that different physical processes have different impacts on precipitation,with cloud microphysics,land surface and cumulus convective processes being the most significant.The impact of the boundary layer scheme is relatively small,but indispensable.The simulation effect of MRF boundary layer scheme is good.The combination of cloud microphysics,land surface process,boundary layer,and cumulus convection parameterization schemes(WSM5,Noah,MRF,Grell-Devenyi)can provide better results for precipitation simulation in the Shiyang River Basin.