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- Title
Heterogeneous N<sub>2</sub>O<sub>5</sub> uptake coefficient and production yield of ClNO<sub>2</sub> in polluted northern China: Roles of aerosol water content and chemical composition.
- Authors
Yee Jun Tham; Zhe Wang; Qinyi Li; Weihao Wang; Xinfeng Wang; Keding Lu; Nan Ma; Chao Yan; Kecorius, Simonas; Wiedensohler, Alfred; Yuanhang Zhang; Tao Wang
- Abstract
Heterogeneous uptake of dinitrogen pentoxide (N2O5) and production of nitryl chloride (ClNO2) are important nocturnal atmospheric processes that have significant implications for the production of secondary pollutants. However, the understanding of N2O5 uptake processes and ClNO2 production remains limited, especially in China. This study presents a field investigation of the N2O5 heterogeneous uptake coefficient (γ(N2O5)) and ClNO2 production yield (ϕ) in a polluted area of northern China during the summer of 2014. The N2O5 uptake coefficient and ClNO2 yield were estimated in 10 selected cases using simultaneously measured concentrations of ClNO2 and particulate nitrate. The determined γ(N2O5) and ϕ values varied greatly, with an average of 0.022 for γ(N2O5) (in range of 0.006–0.034) and 0.34 for ϕ (range, 0.07–1.04). The variations in γ(N2O5) could not be fully explained by the previously derived parameterizations of N2O5 uptake that consider nitrate, chloride, and the organic coating. Heterogeneous uptake of N2O5 was found to have a strong positive dependence on the relative humidity and aerosol water content. This result suggests that the heterogeneous uptake of N2O5 in Wangdu is governed mainly by the amount of water in the aerosol, a phenomenon that differs from other field observations in the United States and Europe. Laboratory-derived parameterization also overestimated the ClNO2 yield. The observation-derived ϕ showed a decreasing trend with an increasing ratio of acetonitrile to carbon monoxide, an indicator of biomass burning emissions, which suggests a possible suppressive effect on the production yield of ClNO2 in the plumes influenced by biomass burning in this region. The findings of this study illustrate the need to improve our understanding and to parameterize the key factors for γ(N2O5) and ϕ to accurately assess the photochemical and haze pollution.
- Subjects
ATMOSPHERIC nitrogen oxides; ATMOSPHERIC aerosols; COMPOSITION of water; COEFFICIENTS (Statistics); PARTICULATE nitrate; BIOMASS burning
- Publication
Atmospheric Chemistry & Physics Discussions, 2018, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2018-313