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大气冰核谱对雷暴云微物理过程及起电影响的数值模拟

Numerical Simulation of the Impact of Ice Nucleus Spectra on Microphysical Process and Electrification in Thunderstorms
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摘要 利用已有的二维对流云模式,讨论了三种不同的冰核谱对雷暴云微物理、起电及电荷结构的影响。模拟结果表明:(1)不同的冰核谱环境对雷暴云中冰相粒子的含量及分布具有明显作用。冰核谱的垂直温区越大,产生的冰相粒子分布越广。在冰核浓度较大的个例中,冰晶和霰粒子的含量高,更多的小冰相粒子出现在海拔更高的区域;(2)高温区冰核的数量会对上升气流速度产生显著影响。高温区的冰核越多,冰相粒子在微物理发展过程中释放的潜热越多,上升气流强,对流发展越旺盛;(3)在低温区冰晶浓度高的谱环境个例中,雷暴云中的非感应起电率和感应起电率高,导致起电量增加。高温区冰核多的谱环境,大量冰晶和霰获得正电荷形成次正电荷区,电荷结构呈现三极性;而高温区冰核少的谱环境,参与起电的水成物粒子少,易形成偶极性电荷结构。 In this paper, we discuss the effect of three different ice nucleus spectral environments on the microphysical, electrification, and charge structure of thunderstorm clouds, using the existing two-dimensional(2-D) cumulus model. Simulation results show that:(1) Different ice nucleus spectral environments have a great influence on the content and distribution of ice-phase particlesin thunderstorm clouds. The larger the vertical temperature zone of the ice nucleusspectral, the wider the distribution of the ice phase particles produced. In the case of a large concentration of ice nucleus, the content of ice crystals and graupel particles is high, more small ice crystals appear in the zone of higher elevations;(2) The number of ice nucleus in high-temperature region has a significant affects the updrafts velocity. More ice nucleus in the high-temperature region leads to more latent heat released by the ice phase particles during the development of the microphysical process, resulting in intensive updrafts and vigorous convection development;(3) In the case of ice nucleusspectral environment with high ice crystal concentration in the low-temperature region, The non-inductive electric rate and inductive electric rate are high in thunderstorm clouds, resulting in increased charge. In the spectral environment with high ice nucleus in high temperature regions, a large number of ice crystals and graupel gain positive charge to form a sub-positive charge zone, and the charge structure exhibits tripolarity;while in a high-temperature zone, the spectrum environment with less ice nuclei and less hydrometeors particles participate in electrification, Dipolar charge structures are easily formed.
作者 王梦旖 谭涌波 师正 刘俊 于梦颖 郑天雪 WANG Mengyi;TAN Yongbo;SHI Zheng;LIU Jun;YU Mengying;ZHENG Tianxue(Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science & Technology,Nanjing 210044,Jiangsu,China)
出处 《高原气象》 CSCD 北大核心 2019年第3期593-603,共11页 Plateau Meteorology
基金 国家自然科学基金项目(41805002) 江苏省自然科学基金项目(BK20180808) 江苏省高等学校自然科学研究项目(18KJB170010) 南京信息工程大学人才启动基金项目(2016r042).
关键词 冰晶 冰核谱 电荷结构 数值模拟 Ice crystals ice nucleus spectrum charge structure numerical simulation
作者简介 王梦旖(1993-),女,河南南阳人,硕士研究生,主要从事雷电物理研究.E-mail:1499619436@qq.com;通讯作者:谭涌波(1977-),男,重庆人,教授,主要从事雷电物理、大气电学等方面研究.E-mail:ybtan@ustc.edu.
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