Articles | Volume 22, issue 23
https://doi.org/10.5194/acp-22-15243-2022
https://doi.org/10.5194/acp-22-15243-2022
Research article
 | 
30 Nov 2022
Research article |  | 30 Nov 2022

The unexpected high frequency of nocturnal surface ozone enhancement events over China: characteristics and mechanisms

Cheng He, Xiao Lu, Haolin Wang, Haichao Wang, Yan Li, Guowen He, Yuanping He, Yurun Wang, Youlang Zhang, Yiming Liu, Qi Fan, and Shaojia Fan

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Latest update: 13 Jul 2024
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Short summary
We report that nocturnal ozone enhancement (NOE) events are observed at a high annual frequency of 41 % over 800 sites in China in 2014–2019 (about 50 % higher than that over Europe or the US). High daytime ozone provides a rich ozone source in the nighttime residual layer, determining the overall high frequency of NOE events in China, and enhanced atmospheric mixing then triggers NOE events by allowing the ozone-rich air in the residual layer to be mixed into the nighttime boundary layer.
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