气候变化领域集成服务门户(CCPortal): Molecular Characterization of Water-Soluble Brown Carbon Chromophores in Beijing, China

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DOI	10.1029/2019JD032018
	Molecular Characterization of Water-Soluble Brown Carbon Chromophores in Beijing, China
	Yan C.; Zheng M.; Desyaterik Y.; Sullivan A.P.; Wu Y.; Collett J.L.; Jr.
发表日期	2020
ISSN	2169897X
卷号	125 期号:15
英文摘要	High abundance and strong light absorption of atmospheric brown carbon (BrC) have been reported in East Asia, especially in northern China. However, the molecular-level understanding of BrC chromophores in this area is still limited and quite challenging. In this study, elemental composition of individual BrC chromophores was first investigated in the megacity of Beijing, China, using a powerful platform for the characterization of BrC chromophores, with combination of high-performance liquid chromatography coupled to a UV/Vis absorbance detector and a time-of-flight mass spectrometer with an electrospray ionization source. The results from this study showed that S-containing compounds (e.g., CHOS and CHONS) significantly increased in highly polluted days compared to lightly polluted days, probably due to increased emissions from sources such as coal combustion and favorable conditions for organosulfates formation. It was found that CHON and CHO compounds were the most abundant water-soluble organic compounds in Beijing especially during the wintertime. Nitroaromatic compounds were the major water-soluble BrC chromophores, with three major BrC chromophores (e.g., C6H5NO3, C7H7NO4, and C6H5NO4) found under all conditions, while other specific BrC chromophores with CHON- and CHO-containing elemental formulas identified and varied in different seasons and pollution conditions. Overall, the water-soluble BrC chromophores identified in this study explained about 2%–18% of the bulk BrC absorbance over the wavelength range of 300–400 nm. In-depth studies on exploring more BrC chromophores as well as their chemical structures, related sources, and formation mechanisms should be conducted in the future. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	brown carbon; chromophore; light absorption; source; water-soluble
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185863
作者单位	SKL-ESPC and BIC-ESAT, College of Environmental Sciences and Engineering, Peking University, Beijing, China; Environment Research Institute, Shandong University, Qingdao, China; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Now at Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States; Now at Department of Physics, University of Helsinki, Helsinki, Finland
推荐引用方式 GB/T 7714	Yan C.,Zheng M.,Desyaterik Y.,et al. Molecular Characterization of Water-Soluble Brown Carbon Chromophores in Beijing, China[J],2020,125(15).
APA	Yan C..,Zheng M..,Desyaterik Y..,Sullivan A.P..,Wu Y..,...&Jr..(2020).Molecular Characterization of Water-Soluble Brown Carbon Chromophores in Beijing, China.Journal of Geophysical Research: Atmospheres,125(15).
MLA	Yan C.,et al."Molecular Characterization of Water-Soluble Brown Carbon Chromophores in Beijing, China".Journal of Geophysical Research: Atmospheres 125.15(2020).