中文摘要：

利用可分辨云模式（WRF），模拟研究了不同气溶胶浓度对北京地区2001年8月23目一次产生强降水和冰雹的对流天气的影响。结果表明，气溶胶浓度的增加不利于对流云的发展，导致地面降水减小，但是对降水结构没有明显影响。气溶胶浓度增加导致云中水成物数浓度和质量浓度均发生变化，其中云水、冰晶和雪含量增加，而雨水、霰和雹含量减小。从云微物理学分析发现，气溶胶浓度减小有利于高层云的形成，云滴有效半径随着气溶胶浓度增加而减小。

英文摘要：

The high-resolution （lkm） WRF modeling system was used to study the influence of aerosol on the cloud properties and precipitation associated with a mesoscale convective system in Beijing under maritime, continental, polluted continental conditions. The development of convective clouds was simulated under the same meteorological conditions except different initial aerosol concentrations. The results show that polluted convective clouds start their precipitation later and precipitate less than normal clouds and clean clouds. The evolution and overall structure of the simulated mesoscale organized convection are largely insensitive to aerosol concentrations. The impact of aerosols on the cloud properties is also investigated on the basis of mass and number concentration of various condensate categories （i. e. , cloud droplet, ice, snow, rain water, graupel and hail）. Both the number concentration and mixing ratio of the cloud water, ice and snow increase with the aerosol concentration increasing, whereas the other three compositions have an opposite correlation. In addition, analysis of the simulated cloud fraction indicates that the maximum and minimum upper-level cloud amounts occur under the maritime and polluted continental environment, respectively, and an intermediate cloudiness appears in the continental aerosol scenario. Furthermore, the cloud effective radius is inversely related to the aerosol concentration.