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Discussion papers
https://doi.org/10.5194/acp-2019-1039
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1039
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Dec 2019

Submitted as: research article | 13 Dec 2019

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This preprint is currently under review for the journal ACP.

Heterogeneous N2O5 reactions on atmospheric aerosols at four Chinese sites: Improving model representation of uptake parameters

Chuan Yu1,2, Zhe Wang3, Men Xia2, Xiao Fu2, Weihao Wang2, Yee Jun Tham2,4, Tianshu Chen1, Penggang Zheng1, Hongyong Li1, Ye Shan1, Xinfeng Wang1, Likun Xue1, Yan Zhou5, Dingli Yue5, Yubo Ou5, Jian Gao6, Keding Lu7, Steven S. Brown8,9, Yuanhang Zhang7, and Tao Wang2 Chuan Yu et al.
  • 1Environment Research Institute, Shandong University, Ji'nan, Shandong, China
  • 2Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
  • 3Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Hong Kong, China
  • 4Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, 00014, Helsinki, Finland
  • 5Guangdong Environmental Monitoring Center, State Environmental Protection Key Laboratory of Regional Air Quality Monitoring, Guangzhou, China
  • 6Chinese Research Academy of Environmental Sciences, Beijing, China
  • 7State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China
  • 8Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, CO, USA
  • 9Department of Chemistry, University of Colorado Boulder, Boulder, CO, USA

Abstract. Heterogeneous reactivity of N2O5 on aerosols is a critical parameter in assessing NOx fate, nitrate production, and particulate chloride activation. Accurate measurement of its uptake coefficient (γN2O5) and representation in air quality model are challenging, especially in the polluted environment. With an in-situ aerosol flow tube system, the γN2O5 was directly measured on ambient aerosols at two rural sites in northern and southern China. The results were analyzed together with the γN2O5 derived from previous field studies in China to obtain a holistic picture of N2O5 uptake and the influencing factors under various climatic and chemical conditions. The field derived/measured γN2O5 was generally promoted by the aerosol water content and suppressed by particle nitrate. Significant discrepancies were found between the measured γN2O5 and that estimated from laboratory-determined parameterizations. An observation-based empirical parameterization was derived in the present work, which better reproduced the mean value and variability of the observed γN2O5. Incorporating this new parameterization in a regional air quality model (WRF-CMAQ) has improved the simulation of nitrogen oxides and secondary nitrate in the polluted regions of China.

Chuan Yu et al.

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Short summary
This study provides a holistic picture of N2O5 heterogeneous uptake on ambient aerosols and the influencing factors under various climatic and chemical conditions in China, and proposes an observation-based empirical parameterization. The empirical parameterization can be used in air quality models to improve the prediction of PM2.5 and photochemical pollution in China and similar polluted regions of the world.
This study provides a holistic picture of N2O5 heterogeneous uptake on ambient aerosols and the...
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