WRF-Chem中沙尘天气过程对模式分辨率及边界层方案的敏感性试验

利用数值模式WRF-Chem对兰州大学半干旱气候与环境观测站(SACOL)所在地区2010年4月10～11日的沙尘天气过程进行了水平分辨率分别为10、3和1 km的模拟分析。在每个试验中分别采用了YSU和MYJ边界层方案。结果表明,3种分辨率的试验都较好地反映了沙尘天气过程中PM10随时间的变化特征,显示出WRF-Chem对沙尘天气过程具有良好的模拟能力,但是在复杂地形区域,模式分辨率的提高并不能相应提高模拟结果的精度。在该试验中,采用MYJ边界层方案对PM10的模拟效果优于YSU方案,反映出在热通量对整个过程不具有决定性影响的情况下,MYJ方案取得了更加接近实际的结果。

Simulation of Dust Aerosol Using WRF-Chem with Different Resolutions and Boundary Schemes

Based on the data from the Semi-Arid Climate Observatory and Laboratory(SACOL) during the period from 10 April 2010 to 11 April 2010,experimental simulation of dust aerosol was carried out using WRF-Chem with resolution 10 km,3 km and 1 km.Two boundary schemes(YSU and MYJ) were used respectively in each case.Tne results showed that: all cases with different resolution represented similar variation tendency with the observation,indicating the capability of WRF-Chem in the dust aerosol simulation.However,in the complicated terrain condition,the case with higher resolution did not necessarily get a better result.In this experiment,the case with MYJ resulted of a higher accuracy,indicating that the results of simulation using MYJ scheme has good agreement with the observation when the heat flux is not the decisive factor in the weather process.