Articles | Volume 18, issue 8
https://doi.org/10.5194/acp-18-5515-2018
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, Becky Alexander, Lei Geng, Xiyuan Chi, Shidong Fan, Haicong Zhan, Hui Kang, Guangjie Zheng, Yafang Cheng, Hang Su, Cheng Liu, and Zhouqing Xie

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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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