硫酸盐气溶胶对全球水循环因子的影响

  利用卫星资料进一步检验了CAM3.0模式对云的模拟能力，该模式可以较好地再现全球云的分布和季节变化的主要特征。在硫循环过程与辐射和动力过程之间双向耦合的情况下，探讨了硫酸盐气溶胶直接气候效应对水循环过程的影响。模式较好地模拟了硫酸盐气溶胶的浓度和分布变化。硫酸盐气溶胶对水循环因子的影响在不同季节和区域是不同的，其中，北半球夏季的影响最大，这是因为北半球夏季硫酸盐浓度最高。纬向平均的云量、降水和水汽的变化形势大部分相似，存在比较密切的联系。

Sulfate Aerosol's Effects on Global Hydrological Cycle

The Community Atmosphere Model Version 3 (CAM3.0)'s simulation ability was evaluated by comparing its simulation results with the related satellite observation data. It was found that the CAM3.0 is able to satisfactorily reproduce the main characters of cloud distribution and its seasonal variations. The direct climate effect of sulfate aerosols on hydrological cycle was investigated through coupling the sulfate cycle with radiation and dynamic processes. The changes in the mass concentration and distribution of sulfate aerosols were simulated well. Sulfate aerosol's effects on hydrological cycle are different in different seasons and regions: the effect in the Northern Hemisphere is greater than that in the Southern Hemisphere in summer because the sulfate mass concentration is greater in the Northern Hemisphere. The trends of changes in cloud fraction, precipitation, and special humidity are mostly similar, indicating that there are close relationships among them.