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https://doi.org/10.5194/egusphere-2024-3210
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egusphere-2024-3210
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
18 Oct 2024
| 18 Oct 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
Observation and modelling of atmospheric OH and HO2 radicals at a subtropical rural site and implications for secondary pollutants
Abstract. HOX radicals (OH and HO2) are crucial oxidants that determine atmospheric oxidation capacity and the production of secondary pollutants; however, their sources and sinks remain incompletely understood in certain forest and maritime environments. This study measured HO2 and OH concentrations using a chemical ionisation mass spectrometer at a subtropical rural site in southern China from 12 November to 19 December 2022. The average peak concentrations were 3.50 ± 2.47 × 106 cm−3 for OH and 1.34 ± 0.93 × 108 cm−3 for HO2. Calculations based on an observation-constrained chemical model revealed an overestimation of HO2 and OH concentrations during warm periods of the field study. These inaccuracies resulted in overestimations of production rates in the model simulation by up to 98 % for ozone and 341 % for nitric acid. Our study highlights the need for further improving understanding of the sources/sinks of OH and HO2.
How to cite. Zou, Z., Chen, T., Chen, Q., Sun, W., Han, S., Ren, Z., Li, X., Song, W., Ge, A., Wang, Q., Tian, X., Pei, C., Wang, X., Zhang, Y., and Wang, T.: Observation and modelling of atmospheric OH and HO2 radicals at a subtropical rural site and implications for secondary pollutants, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2024-3210, 2024.
Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Zhouxing Zou
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Tianshu Chen
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Qianjie Chen
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Weihang Sun
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Shichun Han
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Zhuoyue Ren
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Xinyi Li
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Wei Song
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Aoqi Ge
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Qi Wang
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Xiao Tian
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Chenglei Pei
Guangdong Province Guangzhou Ecological Environment Monitoring Center Station, Guangzhou 510030, China
Xinming Wang
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Yanli Zhang
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Short summary
We measured ambient OH and HO2 concentrations at a subtropical rural site and compared our observations with model results. During warm periods, the model overestimated the concentrations of OH and HO2, leading to overestimation of ozone and nitric acid production. Our findings highlight the need to better understand how OH and HO2are formed and removed, which is important for accurate air quality and climate predictions.
We measured ambient OH and HO2 concentrations at a subtropical rural site and compared our...