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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Impact of COVID-19 lockdown on surface ozone build-up at an urban site in western India based on photochemical box modelling
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Impact of COVID-19 lockdown on surface ozone build-up at an urban site in western India based on photochemical box modelling

机译：基于光化学盒建模的COVID-19锁定对地表臭氧在城市遗址建立的影响

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摘要

Elevated ozone (O-3) near the earth's surface causes adverse impacts on human health and vegetation, besides impacting air chemistry and climate. Intense lockdown to contain the spread of Coronavirus disease 2019 (COVID-19) offered a rare opportunity to delineate the anthropogenic impact on urban O-3 build-up. In this regard, we incorporated observations of chemical species and environmental conditions into a photochemical box model (NCAR Master Mechanism) to study the O-3 changes at a semi-arid urban site in western India (Ahmedabad; 23 degrees N, 72.6 degrees E). In contrast with primary pollutants, daytime O-3 build-up is observed to be enhanced during the lockdown by similar to 39%. Model, driven by lower nitrogen oxides (NO) during the lockdown, also simulated enhanced O-3 (by similar to 41%) showing the role of nonlinear dependence of O(3 )on NOx. Further, a sensitivity simulation unravelled an important role of the meteorological changes in the O-3 enhancement (by similar to 16%) during the lockdown. The results highlight that the lockdown impacts can be modulated profoundly by the complex chemistry plus meteorological changes, offsetting the benefits of lower precursor levels in the context of O-3 pollution.
机译：地球表面附近臭氧（O-3）浓度升高，除了影响空气化学和气候外，还对人类健康和植被造成不利影响。为控制2019年冠状病毒病（COVID-19）的传播而采取的严格封锁措施为描述人为因素对城市O-3聚集的影响提供了难得的机会。在这方面，我们将对化学物种和环境条件的观察纳入光化学箱模型（NCAR主机制），以研究印度西部半干旱城市地区（艾哈迈达巴德；北纬23度，东经72.6度）的O-3变化。与主要污染物相比，在封锁期间，白天O-3的累积量增加了39%。该模型在锁定期间由较低的氮氧化物（NO）驱动，还模拟了增强的O-3（与41%相似），显示了O（3）对NOx的非线性依赖作用。此外，灵敏度模拟揭示了封锁期间气象变化在O-3增强中的重要作用（约16%）。研究结果表明，封锁影响可能会受到复杂化学和气象变化的深刻影响，抵消了O-3污染背景下较低前体水平带来的好处。

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