Effects of Clouds on Aerosol Production and Distribution

9305684这项研究的目的是增进对云和云过程在地方和全球范围内对气溶胶输送和转变的重要性的认识。将开展关于深层对流对对流层气溶胶分布和产生的影响的二维欧拉云域模式研究，特别是对对流层上层的研究。气相和云相化学的描述将与混合相准显式微物理相结合。这一新的气溶胶形成和演化模式将被用来研究化学和输送对气溶胶数量和尺寸浓度的影响。在这项初步工作的基础上，将开发用于NCAR社区气候模式(CCM2)的参数化。然后，将气候模型运行的气溶胶光学厚度与现有的卫星测量结果进行比较，以了解云在这一特性的季节和纬度变化中所起的作用。这项工作将有助于更好地了解云效应的大小，并将有助于预测由于气溶胶分布、人为排放或云类型和数量的变化而可能发生的全球影响。

9305684 Kreidenweis This study is aimed at development of an improved understanding of the importance of clouds and cloud processes upon aerosol transport and transformations on both the local and global scales. A two-dimensional Eulerian cloud domain model study of the impact of deep convection on tropospheric aerosol distribution and production, with particular attention to the upper troposphere, will be performed. Descriptions of gas- and cloud-phase chemistry will be coupled with mixed-phased quasi-explicit microphysics. This new model of aerosol formation and evolution will be employed to study the effects of chemistry and transport upon aerosol number and size concentrations. From this initial work, a parameterization for use with the NCAR Community Climate Model (CCM2) will be developed. Aerosol optical depths from the climate model runs will then be compared with available satellite measurements, with a particular view toward understanding the role of clouds in seasonal and latitudinal variations on this property. This work will lead to improved understanding of the magnitudes of cloud effects, and will assist in the prediction of global effects that may occur due to changes in aerosol distributions, anthropogenic emissions or in cloud type and amounts.