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Discussion papers
https://doi.org/10.5194/acp-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Jan 2019

Research article | 30 Jan 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Effects of organic coating on the nitrate formation by suppressing the N2O5 heterogeneous hydrolysis: A case study during wintertime in Beijing-Tianjin-Hebei (BTH)

Lang Liu1,3, Jiarui Wu1, Suixin Liu1, Xia Li1, Jiamao Zhou1, Tian Feng1, Yang Qian2, Junji Cao1, Xuexi Tie1, and Guohui Li1 Lang Liu et al.
  • 1Key Lab of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
  • 2State Key Laboratory of Environmental Criteria and Risk Assessment & Environmental Standards Institute, Chinese Research Academy of Environmental Sciences, Beijing, China
  • 3University of Chinese Academy of Science, Beijing, China

Abstract. Although stringent emission mitigation strategies have been carried out since 2013 in Beijing-Tianjin-Hebei (BTH), China, heavy haze with high levels of fine particulate matters (PM2.5) still frequently engulfs the region during wintertime and the nitrate contribution to PM2.5 mass has progressively increased. The N2O5 heterogeneous hydrolysis is referred to as the most important pathway of the nitrate formation at nighttime. In the present study, the WRF-CHEM model is applied to simulate a heavy haze episode from 10 to 27 February 2014 in BTH to evaluate the contribution of the N2O5 heterogeneous hydrolysis and the effect of organic coating to the nitrate formation. The model generally performs reasonably well in simulating meteorological parameters, air pollutants and aerosol species against observations in BTH. The N2O5 heterogeneous hydrolysis with all the secondary organic aerosol assumed to be involved in coating considerably improves the nitrate simulations compared to the measurements in Beijing. On average, organic coating decreases nitrate concentrations by 8.4 % in BTH during the episode, and the N2O5 heterogeneous hydrolysis with organic coating contributes about 30.1 % of nitrate concentrations. Additionally, the reaction also plays a considerable role in the heavy haze formation, with a PM2.5 contribution of about 11.6 % in BTH. Sensitivity studies also reveal that future studies need to be conducted to predict the organic aerosol hygroscopicity for accurately representing the organic coating effect on the N2O5 heterogeneous hydrolysis.

Lang Liu et al.
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Lang Liu et al.
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