谭涌波,向春燕. 2017. 冰晶核化对雷暴云闪电行为影响的数值模拟研究[J]. 气象学报, ():-, doi:10.11676/qxxb2017.015
冰晶核化对雷暴云闪电行为影响的数值模拟研究
Numerical Simulation Research on the Effect of Ice Nucleation on Thundercloud Lightning Behavior
投稿时间:2016-07-16  最后修改时间:2016-10-24
DOI:10.11676/qxxb2017.015
中文关键词:  冰晶,核化方案,起电率,电荷结构,放电特征
英文关键词:Ice  crystals, Nucleation  scheme, Charging  rate, Charge  structure, Discharge  characteristics
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
作者单位E-mail
谭涌波 南京信息工程大学气象灾害预报预警与评估协同创新中心、南京信息工程大学中国气象局气溶胶与云降水重点开放实验室 ybtan@ustc.edu 
向春燕 南京信息工程大学气象灾害预报预警与评估协同创新中心、南京信息工程大学中国气象局气溶胶与云降水重点开放实验室 793999881@qq.com 
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中文摘要:
      为了探讨冰晶核化对雷暴云闪电行为的影响,通过已有的三维对流云起、放电模式探讨对比了三种冰晶核化方案,分别为原模式中的经验公式YS方案及与气溶胶相关的DE方案和LP方案,研究表明冰晶核化方案对雷暴云内冰晶微物理发展特征、起电及放电过程均有一定影响。模拟结果显示:(1)考虑了气溶胶的两种新参数化方案中冰晶粒子在高温区(大于-13.8 °C)出现,在雷暴云发展过程中DE方案和LP方案冰晶的垂直分布均大于YS方案。(2)DE方案和LP方案中高温区出现的冰晶所带电荷极性有明显的反转现象,导致雷暴云电荷结构产生差异;雷暴云发展旺盛时刻DE方案和LP方案出现三级性电荷结构,而YS方案在整个雷暴云过程都是偶极性,并且DE方案和LP方案中电荷空间分布区域更加广泛。(3)不同核化方案下雷暴云放电特征存在差异,YS方案在偶极性电荷结构背景下没有负地闪产生,而DE方案和LP方案中次正电荷区的存在促进了负地闪的发生,并且负先导出现在较低的高度范围内;DE方案和LP方案中电荷量级较大,因此云闪发生频次以及正、负先导传播次数增加明显。
英文摘要:
      A?three-dimensional?(3-D)?cumulus?model?with?electrification?and?lightning?process?is?used?to?investigate?the differences?of?electrification?and?lightning?process?between??different ice crystal nucleation schemes.?Three ice crystal nucleation schemes are adopted in this study, which are the original empirical formula YS scheme and DE scheme and LP scheme associated with aerosols, studies show that the micro-process and electrification?and?lightning?process of thunderstorm is influenced by ice crystals nucleation schemes. Simulation results show that: (1) Ice crystals arise in high temperature(>-13.8 °C) region in the two new schemes associated with aerosols, the vertical distribution of ice crystals in DE scheme and LP scheme are greater than the YS scheme''s throughout the thundercloud development process. (2) Ice crystals in high temperature?region with charge in DE scheme and LP scheme show an obvious polarity reversal phenomenon, which leads the charge structure is different in three schemes, and it’s tripolar in DE scheme and LP scheme across the development times of thunderstorm, while dipolar in the YS scheme in the whole process of thunderstorm, the charge distribution area and the number of charges in DE scheme and LP scheme are greater than in the YS scheme. (3)The thundercloud discharge behaviors under different schemes are discrepant, negative cloud-to-ground lightning not generates in YS scheme because of the dipolar charge structure, the lower positive charge in DE scheme and LP scheme increases negative cloud-to-ground lightning and negative leader segements appear in a lower region; the intra-cloud flash frequency and the transmission of positive leader segements and negative leader segements significantly increased distinctly in DE scheme and LP scheme because the magnitude of charge in DE scheme and LP scheme are greater than YS scheme.
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