Song, H, Chen, X, Lu, K et al. (11 more authors) (2020) Influence of aerosol copper on HO2 uptake: a novel parameterized equation. Atmospheric Chemistry and Physics, 20 (24). pp. 15835-15850. ISSN 1680-7316
Abstract
Heterogeneous uptake of hydroperoxyl radicals (HO2) onto aerosols has been proposed to be a significant sink of HOx, hence impacting the atmospheric oxidation capacity. Accurate calculation of the HO2 uptake coefficient γHO2 is key to quantifying the potential impact of this atmospheric process. Laboratory studies show that γHO2 can vary by orders of magnitude due to changes in aerosol properties, especially aerosol soluble copper (Cu) concentration and aerosol liquid water content (ALWC). In this study we present a state-of-the-art model called MARK to simulate both gas- and aerosol-phase chemistry for the uptake of HO2 onto Cu-doped aerosols. Moreover, a novel parameterization of HO2 uptake was developed that considers changes in relative humidity (RH) and condensed-phase Cu ion concentrations and which is based on a model optimization using previously published and new laboratory data included in this work. This new parameterization will be applicable to wet aerosols, and it will complement current IUPAC recommendations. The new parameterization is as follows (the explanations for symbols are in the Appendix):
1γHO21αHO2=+3×υHO24×106×RdHcorrRT×(5.87+3.2×ln(ALWC/[PM]+0.067))×[PM]−0.2×[Cu2+]0.65eff+υHO2l4RTHorgDorgε.
All parameters used in the paper are summarized in Table A1. Using this new equation, field data from a field campaign were used to evaluate the impact of the HO2 uptake onto aerosols on the ROx (= OH + HO2 + RO2) budget. Highly variable values for HO2 uptake were obtained for the North China Plain (median value < 0.1).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Jan 2021 12:33 |
Last Modified: | 25 Jun 2023 22:32 |
Status: | Published |
Publisher: | European Geosciences Union |
Identification Number: | 10.5194/acp-20-15835-2020 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:169785 |