Preprints
https://doi.org/10.5194/acp-2021-541
https://doi.org/10.5194/acp-2021-541

  22 Jul 2021

22 Jul 2021

Review status: this preprint is currently under review for the journal ACP.

N2O5 uptake onto saline mineral dust: a potential missing source of tropospheric ClNO2 in inland China

Haichao Wang1,, Chao Peng2,, Xuan Wang3,, Shengrong Lou4, Keding Lu5, Guicheng Gan6, Xiaohong Jia1, Xiaorui Chen5, Jun Chen6, Hongli Wang4, Shaojia Fan1,7, Xinming Wang2,8,9, and Mingjin Tang2,8,9 Haichao Wang et al.
  • 1School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China
  • 2State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
  • 3School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, China
  • 4State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Complex, Shanghai Academy of Environmental Sciences, Shanghai, China
  • 5State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China
  • 6Institute of Particle and Two-Phase Flow Measurement, College of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, China
  • 7Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary, Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
  • 8CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
  • 9University of Chinese Academy of Sciences, Beijing, China
  • These authors contributed equally to this work.

Abstract. Nitryl chloride (ClNO2), an important precursor of Cl atoms, significantly affects atmospheric oxidation capacity and O3 formation. However, sources of ClNO2 in inland China have not been fully elucidated. In this work, laboratory experiments were conducted to investigate heterogeneous reaction of N2O5 with eight saline mineral dust samples collected from different regions in China, and substantial formation of ClNO2 was observed. ClNO2 yields, φ(ClNO2), showed large variations (ranging from < 0.05 to ~0.77) for different saline mineral dust samples, largely depending on mass fractions of particulate chloride. In addition, for different saline mineral dust samples, φ(ClNO2) could increase, decrease or show insignificant change as RH increased from 18 % to 75 %. We further found that current parameterizations significantly overestimated φ(ClNO2) for heterogeneous uptake of N2O5 onto saline mineral dust. Assuming a uniform φ(ClNO2) value of 0.10 for N2O5 uptake onto mineral dust, we used a 3-D chemical transport model to assess the impact of this reaction on tropospheric ClNO2 in China, and found that weekly mean nighttime maximum ClNO2 mixing ratios could be increased by up to 85 pptv during a severe dust event in May 2017. Overall, our work showed that heterogeneous reaction of N2O5 with saline mineral dust could be an important source of tropospheric ClNO2 in inland China.

Haichao Wang et al.

Status: open (until 02 Sep 2021)

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Haichao Wang et al.

Haichao Wang et al.

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Short summary
Via combining laboratory and modeling work, we found that heterogeneous reaction of N2O5 with saline mineral dust aerosol could be an important source of tropospheric ClNO2 in inland regions.
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