Observation based study on atmospheric oxidation capacity in Shanghai during late-autumn: Contribution from nitryl chloride
Lou S.; Tan Z.; Gan G.; Chen J.; Wang H.; Gao Y.; Huang D.; Huang C.; Li X.; Song R.; Wang H.; Wang M.; Wang Q.; Wu Y.; Huang C.
Date Issued2022
Other AbstractAtmospheric oxidation processes are important to convert freshly emitted trace gases to secondary pollutants. ROx radicals (including hydroxyl radical (OH), hydroperoxyl radical (HO2), and organic peroxyl radical (RO2)) dominate the atmospheric oxidation capacity. In this study, measurements of ROx chemistry precursors and products are presented in Shanghai, a megacity in eastern China during late autumn. During the campaign, two types of air masses are identified, one of which is warm air parcel characterized by relatively higher concentrations of particulate matters and ozone. An observational based chemical box model is utilized to simulate the radical chemistry. HONO is the most important radical source contributing more than one-third of the total radical primary source. However, alkene ozonolysis reactions not only serve as a non-photolytic source but also become relative important during polluted cases indicating the important role in polluted conditions. The maximum ClNO2 was 0.4 ppbv (5min averaged) with a 1h diurnal averaged maximum of 0.16 ppbv and 0.06 ppbv for polluted and clean cases, respectively. The contribution of ClNO2 photolysis to the total primary radical production is <1% on 24h averaged based. Though the campaign was conducted in late autumn when ClNO2 was considered as a relatively important radical source compared to summer conditions, our results suggest the contribution of ClNO2 may vary from case to case. The role of Cl radical and OH radical in secondary pollution formation is explored. Although the model predicts that the concentrations of Cl radicals are orders of magnitude smaller than that of OH radicals, further model analysis highlight that the ozone production per VOC oxidation is more efficient due to Cl radical initiated the reaction chain compared to OH radical. The ubiquitous presence of ClNO2 with large spatial and temporal variability demonstrates that the contribution of ClNO2 to photochemical processes should be further investigated with field observations in variable environments/seasons. © 2021 Elsevier Ltd
KeywordAtmospheric Oxidation Capacity (AOC)Nitryl ChlorideOzone productionShanghai
scopus keywordsAir pollution; Atmospheric chemistry; Chlorine; Free radicals; Oxidation; Ozone; Photolysis; Atmospheric oxidation; Atmospheric oxidation capacity; Condition; Nitryl chloride; OH radical; Oxidation process; Ozone production; Radical source; Shanghai; Chlorine compounds; alkene; hydroxyl radical; nitrogen derivative; nitrous acid; nitryl chloride; ozone; unclassified drug; atmospheric chemistry; autumn; chloride; concentration (composition); hydroxyl radical; observational method; oxidation; photolysis; radical; trace gas; Article; atmospheric oxidation capacity; autumn; China; oxidation; ozonolysis; particulate matter; photochemistry; photolysis; summer; China; Shanghai
Document Type期刊论文
AffiliationState Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai, 200233, China; Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, 52428, Germany; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; Guangdong 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; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
Recommended Citation
GB/T 7714
Lou S.,Tan Z.,Gan G.,et al. Observation based study on atmospheric oxidation capacity in Shanghai during late-autumn: Contribution from nitryl chloride[J],2022,271.
APA Lou S..,Tan Z..,Gan G..,Chen J..,Wang H..,...&Huang C..(2022).Observation based study on atmospheric oxidation capacity in Shanghai during late-autumn: Contribution from nitryl chloride.ATMOSPHERIC ENVIRONMENT,271.
MLA Lou S.,et al."Observation based study on atmospheric oxidation capacity in Shanghai during late-autumn: Contribution from nitryl chloride".ATMOSPHERIC ENVIRONMENT 271(2022).
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