| 气溶胶对雷暴云微物理过程和起电影响的数值模拟 |
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| 引用本文： | 刘俊,谭涌波,师正,王梦旖,于梦颖,郑天雪.气溶胶对雷暴云微物理过程和起电影响的数值模拟[J].气候与环境研究,2018,23(6):758-768. |
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| 作者姓名： | 刘俊 谭涌波 师正 王梦旖 于梦颖 郑天雪 |
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| 作者单位： | 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室, 南京 210044 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）项目2014CB441403，国家自然科学基金项目41475006、41805002，江苏省自然科学基金资助项目BK20180808，江苏省高等学校自然科学研究项目资助18KJB170010，南京信息工程大学人才启动基金资助项目2016r042 |
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| 摘 要： | 将云滴冻结方案植入已有的二维雷暴云起、放电模式，结合一次山地雷暴个例，探讨了气溶胶浓度对雷暴云微物理过程、起电以及空间电荷结构的影响。结果表明:气溶胶浓度增加，云滴数目增多，尺度降低，雨滴含量减少；云滴冻结导致冰晶在低温区快速生长，冰晶数浓度增加，尺度减小，当气溶胶浓度高于1000 cm-3后小冰晶难以增长成大尺度的霰粒子，因此霰粒子数浓度先增加后急剧减少。此外，气溶胶浓度的大小不会影响雷暴云的电荷结构特征，但会对云内的起电强度产生明显的作用:当气溶胶浓度较低时，增加气溶胶浓度，更多的冰晶和霰粒子发生碰撞使得云内起电过程增强，空间电荷密度增加；当气溶胶浓度高于1000 cm-3后，少量的霰粒子和小冰晶的出现抑制了非感应起电过程，导致电荷密度降低。
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| 关 键 词： | 气溶胶 云滴冻结 非感应起电 电荷结构 |
| 收稿时间： | 2018/3/29 0:00:00 |
A Numerical Study of Aerosol Effects on Microphysical Process and Electrification in Thunderstorms |
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| LIU Jun,TAN Yongbo,SHI Zheng,WANG Mengyi,YU Mengying and ZHENG Tianxue.A Numerical Study of Aerosol Effects on Microphysical Process and Electrification in Thunderstorms[J].Climatic and Environmental Research,2018,23(6):758-768. |
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| Authors: | LIU Jun TAN Yongbo SHI Zheng WANG Mengyi YU Mengying and ZHENG Tianxue |
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| Institution: | Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044 |
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| Abstract: | A two-dimensional (2-D) cumulus model with electrification and lightning processes is implemented to investigate aerosol effects on microphysical process, electrification, and charge structure in thunderstorms. The 2-D cumulus model coupled with a droplet freezing module is used to simulate a SEET (Studies of Electrical Evolution in Thunderstorms) case. The results show that the number concentration of cloud droplets increases and its scale decreases with increasing aerosol concentration, but the content of raindrops reduces. Ice crystals grow rapidly in low temperature region, which is attributed to droplets freezing, and the number concentration of ice crystals increases but the scale decreases. The number concentration of graupels increases first and then decreases sharply because ice crystals are difficult to grow into graupels with larger scale when the aerosol concentration exceeds 1000 cm-3. In addition, the charge structure of thunderstorms is not affected by aerosol concentration, but aerosols have significant effect on the strength of electrification, i.e., when the aerosol concentration is lower, more ice crystals and graupels collision enhances the non-inductive charging process and increases the charge density as the aerosol concentration increases; however, the non-inductive charging rate starts to decrease when the aerosol concentration exceeds 1000 cm-3 due to the appearance of small ice crystals and little graupels, and the charge density is reduced. |
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| Keywords: | Aerosol Cloud droplet freezing Non-inductive charging Charge structure |
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