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DOI	10.1029/2021JD034791
	The Roles of N, S, and O in Molecular Absorption Features of Brown Carbon in PM2.5 in a Typical Semi-Arid Megacity in Northwestern China
	Zeng Y.; Ning Y.; Shen Z.; Zhang L.; Zhang T.; Lei Y.; Zhang Q.; Li G.; Xu H.; Ho S.S.H.; Cao J.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:16
英文摘要	Brown Carbon (BrC) absorbs light in wavelength of 300–400 nm, and BrC molecule (BrCM) is a fundamental component responsible for aerosol radiative forcing. In this study, Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS) coupled with electrospray ionization (ESI) was used to determine methanol extracted BrCM in PM2.5 collected in Xi'an, China. The absorption of individual BrCM was quantified through partial least square regression (PLSR) method. Results showed that 77.5% and 91.8% of winter and summer BrCMs were weak absorptive. The top BrCMs were responsible for 60.4% and 84.6%, respectively, of the absorbances in summer and winter. The nitrogen (N)-containing organic molecules were identified to be critical components of light-absorbing matters in both of the two seasons, outlining the significance of N chromogenesis in BrC. The top BrCMs were more closely related to -(O)NO2 that originated from NO2 engaged reactions in winter, and to -NH that formed in NH3 reactions in summer. Sulfur (S)-containing functional groups were not chromophoric while sulfur dioxide (SO2) triggered N-containing and S-free BrCM formations under high nitrogen oxides (NOx) concentration levels and relative humidity (RH) in winter. Hypochromicity of oxygen (O) in BrC was discovered because of the photobleaching of oxidation and weak light-absorbing of highly oxidized molecules. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	brown carbon; ESI FT-ICR MS; molecular absorption; PLSR
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/237114
作者单位	Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, China; State Key Laboratory of Fluorine &Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an, China; The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, ONT, Canada; Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States
推荐引用方式 GB/T 7714	Zeng Y.,Ning Y.,Shen Z.,et al. The Roles of N, S, and O in Molecular Absorption Features of Brown Carbon in PM2.5 in a Typical Semi-Arid Megacity in Northwestern China[J],2021,126(16).
APA	Zeng Y..,Ning Y..,Shen Z..,Zhang L..,Zhang T..,...&Cao J..(2021).The Roles of N, S, and O in Molecular Absorption Features of Brown Carbon in PM2.5 in a Typical Semi-Arid Megacity in Northwestern China.Journal of Geophysical Research: Atmospheres,126(16).
MLA	Zeng Y.,et al."The Roles of N, S, and O in Molecular Absorption Features of Brown Carbon in PM2.5 in a Typical Semi-Arid Megacity in Northwestern China".Journal of Geophysical Research: Atmospheres 126.16(2021).