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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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ACP | Articles | Volume 18, issue 19
Atmos. Chem. Phys., 18, 14465–14476, 2018
https://doi.org/10.5194/acp-18-14465-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Multiphase chemistry of secondary aerosol formation under...

Atmos. Chem. Phys., 18, 14465–14476, 2018
https://doi.org/10.5194/acp-18-14465-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Oct 2018

Research article | 10 Oct 2018

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

Pengzhen He et al.
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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 %.
We present the first observations of the oxygen-17 excess of atmospheric nitrate (Δ17O(NO3))...
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