| 催化对降水区域外效应的中尺度数值模拟 |
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| 作者姓名： | ZHAO Zhen LEI Heng-Chi |
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| 作者单位： | 中科院大气物理研究所,中科院大气物理研究所 |
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| 基金项目： | supported by the National Natural Science Foundation of China (Grant No. 40805056);the National Key Technologies R&D Program of China (Grant No. 2006BAC12B00) |
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| 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 interacts 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.
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| 关 键 词： | cloud seeding extra-area effects silver iodide MM5 |
Numerical Simulation of Seeding Extra Area Effects of Precipitation Using a Three-Dimensional Mesoscale Model |
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| ZHAO Zhen,LEI Heng-Chi.Numerical Simulation of Seeding Extra Area Effects of Precipitation Using a Three-Dimensional Mesoscale Model[J].Atmospheric and Oceanic Science Letters,2010,3(1):19-24. |
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| Authors: | ZHAO Zhen and LEI Heng-Chi |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | 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 interacts 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°C 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. |
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| Keywords: | cloud seeding extra-area effects silver iodide MM5 |
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