Extreme oxidant amounts produced by lightning in storm clouds
Extreme oxidant amounts produced by lightning in storm clouds
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DOI：
10.1126/science.abg0492
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发表时间：
2021-05-14
期刊：
影响因子：
56.9
通讯作者：
Peischl, J.
中科院分区：
文献类型：
--
作者：
Brune, W. H.;McFarland, P. J.;Peischl, J.
闪电通过产生一氧化氮（NO）来增加大气的净化能力，从而导致大气化学形成臭氧（O-3）和大气的主要氧化剂羟基自由基（OH）。我们对2012年深对流和化学的空中研究的分析表明，闪电也直接产生氧化剂OH和过氧化氢自由基（HO 2）。发现了极大量的OH和HO 2，并与飞机前方发生的可见闪光和带电砧区域的亚可见放电有关。这种增强的OH和HO 2的数量级大于任何以前的大气观测。在全球同时发生的所有风暴中，闪电产生的OH可能是全球大气OH氧化的2%至16%的高度不确定性的原因。
Lightning increases the atmosphere's ability to cleanse itself by producing nitric oxide (NO), leading to atmospheric chemistry that forms ozone (O-3) and the atmosphere's primary oxidant, the hydroxyl radical (OH). Our analysis of a 2012 airborne study of deep convection and chemistry demonstrates that lightning also directly generates the oxidants OH and the hydroperoxyl radical (HO2). Extreme amounts of OH and HO2 were discovered and linked to visible flashes occurring in front of the aircraft and to subvisible discharges in electrified anvil regions. This enhanced OH and HO2 is orders of magnitude greater than any previous atmospheric observation. Lightning-generated OH in all storms happening at the same time globally can be responsible for a highly uncertain, but substantial, 2 to 16% of global atmospheric OH oxidation.