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Preprints
https://doi.org/10.5194/acp-2020-218
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-218
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  24 Mar 2020

24 Mar 2020

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A revised version of this preprint is currently under review for the journal ACP.

Influence of aerosol copper on HO2 uptake: A novel parameterized equation

Huan Song1,2, Xiaorui Chen1,2, Keding Lu1,2, Qi Zou1,2, Zhaofeng Tan2,3, Hendrik Fuchs2,3, Alfred Wiedensohler4, Mei Zheng1, Andreas Wahner2,3, Astrid Kiendler-Scharr2,3, and Yuanhang Zhang1,2 Huan Song et al.
  • 1State Key Joint Laboratory or Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China
  • 2International Joint Laboratory for Regional Pollution Control, Jülich, Germany, and Beijing, China
  • 3Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany
  • 4Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany

Abstract. The heterogeneous uptake of hydroxyl peroxy radicals (HO2) on aerosol has been proposed to be a significant sink of HOx, thus could influence the atmospheric oxidation capacity. Accurate calculation of the uptake coefficient γHO2 is the key to quantifying its atmospheric effects. Laboratory studies show that γHO2 varies by orders of magnitude due to change in aerosol properties, especially those of aerosol soluble copper (Cu) and aerosol liquid water content (ALWC). In this study, we develop a state-of-the-art model to simulate both gas and aerosol phase chemistry. A novel parameterized equation of HO2 considering change in RH and aerosol Cu is developed based on model optimization toward all available lab experiments. 1 / γ = 1 / α + (3 × v) / (4 × 106 × Rd Hcorr RT × (5.87 + 3.2 × ln(ALWC / [PM] + 0.067)) × [PM]−0.2 × [Cu2+]0.65) According to the new equation, highly variable HO2 uptake coefficients (median value ∼0.1) were diagnosed for North China Plain and the impact of HO2 uptake on the ROx budget is assessed.

Huan Song et al.

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Huan Song et al.

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Latest update: 07 Aug 2020
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Short summary
Accurate calculation of the HO2 uptake coefficient is one of the key parameter to quantifying the co-reduction of both aerosol and ozone pollutions. We modelled various lab measurements of γHO2 based on a gas-liquid phase kinetic model and developed a state of art parameterized equation. Based on a dataset from a comprehensive field campaign in North China Plain, we proposed that the determination of heterogeneous uptake process for HO2 should be added for the future field campaigns.
Accurate calculation of the HO2 uptake coefficient is one of the key parameter to quantifying...
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