Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, 52428Jülich, Germany.
International Joint Laboratory for Regional Pollution Control, 52428Jülich, Germany.
Environ Sci Technol. 2022 Dec 20;56(24):17569-17580. doi: 10.1021/acs.est.2c06217. Epub 2022 Dec 6.
Tropospheric ozone (O) is a harmful gas compound to humans and vegetation, and it also serves as a climate change forcer. O is formed in the reactions of nitrogen oxides and volatile organic compounds (VOCs) with light. In this study, an O pollution episode encountered in Shenzhen, South China in 2018 was investigated to illustrate the influence of aerosols on local O production. We used a box model with comprehensive heterogeneous mechanisms and empirical prediction of photolysis rates to reproduce the O episode. Results demonstrate that the aerosol light extinction and NO heterogeneous reactions showed comparable influence but opposite signs on the O production. Hence, the influence of aerosols from different processes is largely counteracted. Sensitivity tests suggest that O production increases with further reduction in aerosols in this study, while the continued NO reduction finally shifts O production to an NO-limited regime with respect to traditional O-NO-VOC sensitivity. Our results shed light on the role of NO reduction on O production and highlight further mitigation in NO not only limiting the production of O but also helping to ease particulate nitrate, as a path for cocontrol of O and fine particle pollution.
对流层臭氧（O）是对人类和植被有害的气体化合物，也是气候变化的推动者。O 是由氮氧化物和挥发性有机化合物（VOC）与光的反应形成的。在这项研究中，研究了 2018 年中国南方深圳发生的一次 O 污染事件，以说明气溶胶对当地 O 生成的影响。我们使用了一个带有综合非均相机制和光解率经验预测的箱式模型来再现 O 事件。结果表明，气溶胶的光消光和 NO 非均相反应对 O 生成的影响相当，但符号相反。因此，来自不同过程的气溶胶的影响在很大程度上相互抵消。敏感性测试表明，在本研究中，随着气溶胶的进一步减少，O 的生成会增加，而随着 NO 的持续减少，O 的生成最终会转变为 NO 限制型，这与传统的 O-NO-VOC 敏感性有关。我们的结果阐明了 NO 减少对 O 生成的作用，并强调了进一步减少 NO 不仅限制了 O 的生成，还有助于缓解颗粒硝酸盐，这是控制 O 和细颗粒物污染的协同控制途径。
