Aerosol Effects on Lightning Characteristics: A Comparison of Polluted and Clean Regimes
Aerosol Effects on Lightning Characteristics: A Comparison of Polluted and Clean Regimes
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气溶胶对闪电特性的影响：污染和清洁状况的比较
DOI：
10.1029/2019gl086825
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发表时间：
2020-05-16
影响因子：
5.2
通讯作者：
Heckman, S.
中科院分区：
文献类型：
--
作者：
Liu, Y.;Guha, A.;Heckman, S.
海洋闪电可以成为气溶胶对闪电特性影响的敏感指标，因为邻近海洋区域的热力学对比不明显。该研究通过分析来自南海南部两个关键区域的地球网络总闪电网络的两年（2017-2018）云内（IC）和云对地（CG）闪电数据，展示了气溶胶对闪电特征的可辨别影响。污染条件下的平均中风密度、IC/CG比、+IC分数和+CG分数分别是未污染条件下的3.7、2、1.2和5.8倍。总行程对比度通过 GLD360 网络进一步得到证实。相反，热力学参数支持清洁海洋上稍强的对流。明确的证据表明，云滴尺寸随着气溶胶的增加而减小。气溶胶促进了更频繁、更强劲的混合相发展，赋予海洋对流大陆性特征。推测电荷反转温度以及较低和较高正电荷区域的修改是刺激更多正 IC 和 CG 的手段。
Oceanic lightning can be a sensitive indicator of aerosol effects on lightning characteristics as thermodynamic contrast is indistinct over adjacent oceanic regions. The study presents discernable aerosol impacts on lightning characteristics by analyzing 2 years (2017-2018) of intracloud (IC) and cloud-to-ground (CG) lightning data from Earth Networks Total Lightning Network over two key regions in southern South China Sea. Mean stroke density, IC/CG ratio, +IC fraction, and +CG fraction in polluted conditions are respectively 3.7, 2, 1.2, and 5.8-fold larger than unpolluted counterparts. Total stroke contrast is further confirmed with the GLD360 network. Thermodynamic parameters conversely support slightly stronger convection over clean ocean. Clear evidence shows cloud droplet size diminishes with added aerosol. Aerosol invigorates more frequent and robust mixed-phase development, endowing maritime convection with continental characteristics. Modifications in the charge reversal temperature and lower and upper positive charge regions are speculated on as means for stimulating more positive ICs and CGs.