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Suppression of surface ozone by an aerosol-inhibited photochemical ozone regime
Nature Geoscience ( IF 18.3 ) Pub Date : 2022-07-07 , DOI: 10.1038/s41561-022-00972-9
Peter D. Ivatt, Mathew J. Evans, Alastair C. Lewis

Atmospheric ozone (O3) is a pollutant produced through chemical chain reactions where volatile organic compounds (VOCs), carbon monoxide and methane are oxidized in the presence of oxides of nitrogen (NOx). For decades, the controlling chain termination step has been used to separate regions into either ‘NOx limited’ (peroxyl-radical self-reactions dominate) or ‘VOC limited’ (hydroxyl radical (OH) + nitrogen dioxide (NO2) reaction dominates). The controlling regime would then guide policies for reducing emissions and so O3 concentrations. Using a chemical transport model, we show that a third ‘aerosol inhibited’ regime exists, where reactive uptake of hydroperoxyl radicals (HO2) onto aerosol particles dominates. In 1970, 2% of the Northern Hemisphere population lived in an aerosol-inhibited regime, but by 2014 this had increased to 21%; 60% more than lived in a VOC-limited regime. Aerosol-inhibited chemistry suppressed surface O3 concentrations in North America and Europe in the 1970s and is currently suppressing surface O3 over Asia. This third photochemical O3 regime leads to potential trade-off tensions between reducing particle pollution in Asia (a key current health policy and priority) and increasing surface O3, should O3 precursors emissions not be reduced in tandem.



中文翻译:

通过气溶胶抑制光化学臭氧方案抑制表面臭氧

大气臭氧 (O 3 ) 是通过化学链反应产生的污染物,其中挥发性有机化合物 (VOC)、一氧化碳和甲烷在氮氧化物 (NO x ) 的存在下被氧化。几十年来,控制链终止步骤已被用于将区域分为“NO x限制”(过氧自由基自反应占主导地位)或“VOC 限制”(羟基自由基 (OH) + 二氧化氮 (NO 2 ) 反应占主导地位) )。然后,控制制度将指导减少排放和O 3浓度的政策。使用化学传输模型,我们表明存在第三种“气溶胶抑制”机制,其中氢过氧自由基(HO 2) 在气溶胶颗粒上占主导地位。1970 年,2% 的北半球人口生活在气溶胶抑制状态,但到 2014 年,这一比例增加到 21%;比生活在 VOC 限制制度中的人多 60%。气溶胶抑制化学在 1970 年代抑制了北美和欧洲的表面 O 3浓度,目前正在抑制亚洲的表面 O 3浓度。如果不同时减少O 3前体的排放,这第三种光化学 O 3方案会导致在减少亚洲颗粒污染(当前关键的卫生政策和优先事项)和增加表面 O 3之间潜在的权衡紧张。

更新日期:2022-07-07
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