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

doi:10.1029/2021JD034791

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	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, Yaling 1; Ning, Yanli 2; Shen, Zhenxing 1,3; Zhang, Leiming 4; Zhang, Tian 1; Lei, Yali 1; Zhang, Qian 1; Li, Guohui 3; Xu, Hongmei 1; Ho, Steven Sai Hang 5
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	2021-08-01
卷号	126 期号:16 页码:14
关键词	brown carbon ESI FT-ICR MS PLSR molecular absorption
ISSN号	2169-897X
DOI	10.1029/2021JD034791
通讯作者	Shen, Zhenxing(zxshen@mail.xjtu.edu.cn)
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.
资助项目	Natural Science Foundation of China[41877383] ; Natural Science Foundation of China[41877376] ; Natural Science Foundation of China[21661132005] ; SKLLQG, Chinese Academy of Sciences[SKLLQG1919]
WOS关键词	COMPLEX REFRACTIVE-INDEX ; URBAN ORGANIC AEROSOLS ; PARTIAL LEAST-SQUARES ; MASS-SPECTROMETRY ; LIGHT-ABSORPTION ; SEASONAL-VARIATIONS ; INFRARED-SPECTROSCOPY ; SOUTHEASTERN MARGIN ; OPTICAL-PROPERTIES ; ALPHA-PINENE
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000688706400004
资助机构	Natural Science Foundation of China ; SKLLQG, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/16954]
专题	地球环境研究所_粉尘与环境研究室
通讯作者	Shen, Zhenxing
作者单位	1.Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian, Peoples R China 2.Xian Modern Chem Res Inst, State Key Lab Fluorine & Amp Nitrogen Chem, Xian, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China 4.Environm & Climate Change Canada, Sci & Technol Branch, Air Qual Res Div, Toronto, ON, Canada 5.Desert Res Inst, Div Atmospher Sci, Reno, NV USA
推荐引用方式 GB/T 7714	Zeng, Yaling,Ning, Yanli,Shen, Zhenxing,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]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2021,126(16):14.
APA	Zeng, Yaling.,Ning, Yanli.,Shen, Zhenxing.,Zhang, Leiming.,Zhang, Tian.,...&Cao, Junji.(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),14.
MLA	Zeng, Yaling,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):14.