What question did this study set out to answer?

To evaluate wintertime atmospheric oxidative capacity and identify the chemical pathways driving secondary pollutant formation in the North China Plain.

August 27, 2018Atmospheric chemistry and physicsOpen Access

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

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Authors

ZTZhaofeng TanPeking University FRFranz RöhrerForschungszentrum Jülich KLKeding LuPeking University

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Implication

Observational field study demonstrates elevated winter atmospheric radical levels driven by nitrous acid photolysis, suggesting active secondary pollution formation in polluted urban air.

Key Points

To evaluate wintertime atmospheric oxidative capacity and identify the chemical pathways driving secondary pollutant formation in the North China Plain.
Measured in situ concentrations of hydroxyl (OH), hydroperoxy (HO2), and organic peroxy (RO2) radicals along with total OH reactivity from January to March 2016 during the BEST-ONE campaign.
Simulated radical diurnal profiles and primary production pathways using an atmospheric chemical box model constrained by observed trace gas precursors.
Noontime OH radical concentrations reached 2.4×10⁶ cm⁻³ during polluted episodes and 3.6×10⁶ cm⁻³ in clean air, approximately twice the levels observed in previous megacity winter campaigns.
Primary radical production was driven by nitrous acid photolysis (46%), alkene ozonolysis (28%), and photolysis of oxygenated organic compounds (24%).
Chemical box models reproduced radical variations within a factor of 1.5 on clean days but underestimated HO2 and RO2 by up to 5-fold during high-NOx pollution episodes.

Cite This Study

Tan et al. (2018) studied this question.

synapsesocial.com/papers/6a6f6dede36a167817e122fd https://doi.org/10.5194/acp-18-12391-2018

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Implication

Observational field study demonstrates elevated winter atmospheric radical levels driven by nitrous acid photolysis, suggesting active secondary pollution formation in polluted urban air.

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

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Key Points

Cite This Study

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

Discussion

Member takes

Implication

Key Points

Cite This Study

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