Articles | Volume 18, issue 19
https://doi.org/10.5194/acp-18-14465-2018
https://doi.org/10.5194/acp-18-14465-2018
Research article
 | 
10 Oct 2018
Research article |  | 10 Oct 2018

Atmospheric Δ17O(NO3) reveals nocturnal chemistry dominates nitrate production in Beijing haze

Pengzhen He, Zhouqing Xie, Xiyuan Chi, Xiawei Yu, Shidong Fan, Hui Kang, Cheng Liu, and Haicong Zhan

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Short summary
We present the first observations of the oxygen-17 excess of atmospheric nitrate (Δ17O(NO3)) collected in Beijing haze to reveal the relative importance of different nitrate formation pathways. We found that nocturnal pathways (N2O5 + H2O/Cl and NO3 + HC) dominated nitrate production during polluted days (PM2.5 ≥ 75 μg m–3), with a mean possible fraction of 56–97 %.
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