大气科学Issue(5)：941-952,12.DOI:10.3878/j.issn.1006-9895.1412.14230
气溶胶对雷暴云起电以及闪电发生率影响的数值模拟
A Numerical Study of Aerosol Effects on the Electrification and Flash Rate of Thunderstorms
摘要
Abstract
AbstractA two-dimensional cumulus model coupled with an aerosol module is used to simulate a case of tropical convection in Nanjing. Numerical simulations at a resolution of 250 m are performed to investigate the effect of aerosol concentration on the electrification and lightning flash rate in the thunderstorm clouds. In this aerosol module, the distribution of aerosol particles is fitted by superimposing three log-normal distribution functions, and the activation of aerosol particles to form cloud droplets is considered. The results show that: (1) The charge structure in the thundercloud remains a triple charge structure as the aerosol concentration increases. (2) When the aerosol concentration is changed from 50 to 1000 cm−3, a stronger formation of cloud droplets, graupel and ice crystals results in an increasing charge separation and lightning flash rate. (3) In the range of 1000–3000 cm−3, the decrease in ice crystals caused by vapor competition leads to a reduction in upper positive charge, while the enhancement of graupel and cloud droplets results in the contribution of inductive charge to the middle negative charge region and lower positive charge region increasing with greater aerosol concentration. The flash rate shows a slight change. (4) At very high aerosol concentrations (above 3000 cm−3), the magnitude of the charge and lightning flash rate, which remains steady in the thundercloud, is insensitive to aerosol concentration.关键词
气溶胶/电荷结构/起电机制/闪电发生率/数值模拟Key words
Aerosol/Charge structure/Charge separation mechanism/Flash rate/Numerical simulation分类
天文与地球科学引用本文复制引用
师正,谭涌波,唐慧强,杨忆,彭琳,郭秀峰,陈浩然..气溶胶对雷暴云起电以及闪电发生率影响的数值模拟[J].大气科学,2015,(5):941-952,12.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41175003、41075003、41475006，江苏高校优势学科建设工程资助项目PAPD，江苏省普通高校研究生科研创新计划项目CXZZ13_0515 （）
