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Low-NO atmospheric oxidation pathways in a polluted megacity

机译：污染的巨大度低的大气氧化途径

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The impact of emissions of volatile organic compounds (VOCs) to the atmosphere on the production of secondary pollutants, such as ozone and secondary organic aerosol (SOA), is mediated by the concentration of nitric oxide (NO). Polluted urban atmospheres are typically considered to be “high-NO” environments, while remote regions such as rainforests, with minimal anthropogenic influences, are considered to be “low NO”. However, our observations from central Beijing show that this simplistic separation of regimes is flawed. Despite being in one of the largest megacities in the world, we observe formation of gas- and aerosol-phase oxidation products usually associated with low-NO “rainforest-like” atmospheric oxidation pathways during the afternoon, caused by extreme suppression of NO concentrations at this time. Box model calculations suggest that during the morning high-NO chemistry predominates (95?%) but in the afternoon low-NO chemistry plays a greater role (30?%). Current emissions inventories are applied in the GEOS-Chem model which shows that such models, when run at the regional scale, fail to accurately predict such an extreme diurnal cycle in the NO concentration. With increasing global emphasis on reducing air pollution, it is crucial for the modelling tools used to develop urban air quality policy to be able to accurately represent such extreme diurnal variations in NO to accurately predict the formation of pollutants such as SOA and ozone.
机译：挥发性有机化合物（VOC）对二次污染物（例如臭氧和二次有机气溶胶（SOA））的影响的影响由一氧化氮（NO）的浓度介导。污染的城市气氛通常被认为是“高”环境，而具有最小的人为影响的雨林等偏远地区被认为是“低”。然而，我们从北京中部的观察结果表明，这种制度的简单分离是有缺陷的。尽管存在于世界上最大的大城市之一，但我们观察到午后期间通常与低“雨林”大气氧化途径相关的气体和气溶胶相氧化产品的形成，由极端抑制无浓度引起的这次。框模型计算表明，在早上高 - 没有化学占优势（95？％），但下午低 - 没有化学作用更大（30？％）。目前的排放清单应用于Geos-Chem模型，表明这种模型在区域规模处运行时，不能准确地预测不浓度的极端昼夜循环。随着全球性强调降低空气污染，对于开发城市空气质量政策的建模工具至关重要，以便能够准确地代表如此极端的昼夜变化，以准确预测污染物如SOA和臭氧的形成。

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