中文摘要：

第五产生的 NCAR/Penn 州的 Mesoscale 模型(MM5 ) 被用来调查在在 supercooled 层执行的层状的云上播种的银碘化物(AgI ) 的额外区域的效果。二时刻的 microphysical 计划和新软件为银碘化物包装的体积在 MM5 被合并。额外的保存方程被使用跟踪播种代理人，它沿着流动地被搬运并且与 supercooled 云地交往。在这研究，模型用三个嵌套的格子被运用，与 3.3 km

英文摘要：

The Fifth-Generation NCAR/Penn State Mesoscale Model （MM5） has been used to investigate the extra-area effects of silver iodide （AgI） seeding on stratiform clouds performed at the supercooled layer. A bulk two-moment microphysical scheme and the new software package for silver iodide are incorporated in MM5. Extra conservation equations are applied to trace the seeding agent, which is transported along the flow field and inter- acts with the supercooled cloud fields. In this study, the model was run using three nested grids, with 3.3 km · 3.3 km horizontal resolution in the finest grid. The model results showed that seeding with AgI at the -5 to -15℃ levels had microphysical effects on the simulated clouds and that the simulation produced a longer-lasting seeding effect because of the transport of the seeding agent by upper-level winds. Most of the AgI particles acted as deposition nuclei, and the deposition nucleation process contributed mostly to additional cloud ice formation in this study. The results showed that more precipitation results from seeded than unseeded case, and the precipitation was redistributed downwind of the target. Augmented precipitation （varying from 5% to 25% downwind） was confined in space to within 250 km of the seeding target and in time to the 3-h period after initial seeding.