Articles | Volume 18, issue 16
Atmos. Chem. Phys., 18, 12391–12411, 2018
https://doi.org/10.5194/acp-18-12391-2018
Atmos. Chem. Phys., 18, 12391–12411, 2018
https://doi.org/10.5194/acp-18-12391-2018

Research article 27 Aug 2018

Research article | 27 Aug 2018

Wintertime photochemistry in Beijing: observations of ROx radical concentrations in the North China Plain during the BEST-ONE campaign

Zhaofeng Tan et al.

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Latest update: 26 Oct 2021
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Short summary
We present the first wintertime OH, HO2, and RO2 measurements in Beijing, China. OH concentrations are nearly 2-fold larger than those observed in foreign cities during wintertime. The high OH and large OH reactivities indicate photochemical processes can be effective even during wintertime. A box model largely underestimated HO2 and RO2 concentrations during pollution episodes correlated with high NOx, indicating a deficit current chemistry in the high NOx regime.
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