Articles | Volume 18, issue 8
Atmos. Chem. Phys., 18, 5515–5528, 2018
https://doi.org/10.5194/acp-18-5515-2018
Atmos. Chem. Phys., 18, 5515–5528, 2018
https://doi.org/10.5194/acp-18-5515-2018

Research article 23 Apr 2018

Research article | 23 Apr 2018

Isotopic constraints on heterogeneous sulfate production in Beijing haze

Pengzhen He et al.

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Short summary
We use observations of the oxygen isotopic composition of sulfate aerosol as a fingerprint to quantify various sulfate formation mechanisms during pollution events in Beijing, China. We found that heterogeneous reactions on aerosols dominated sulfate production in general; however, in-cloud reactions would dominate haze sulfate production when cloud liquid water content was high. The findings also suggest the heterogeneity of aerosol acidity should be parameterized in models.
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