气候变化领域集成服务门户(CCPortal): Molecular Absorption and Evolution Mechanisms of PM2.5 Brown Carbon Revealed by Electrospray Ionization Fourier Transform–Ion Cyclotron Resonance Mass Spectrometry During a Severe Winter Pollution Episode in Xi'an; China

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DOI	10.1029/2020GL087977
	Molecular Absorption and Evolution Mechanisms of PM2.5 Brown Carbon Revealed by Electrospray Ionization Fourier Transform–Ion Cyclotron Resonance Mass Spectrometry During a Severe Winter Pollution Episode in Xi'an; China
	Zeng Y.; Shen Z.; Takahama S.; Zhang L.; Zhang T.; Lei Y.; Zhang Q.; Xu H.; Ning Y.; Huang Y.; Cao J.; Rudolf H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	Knowledge of the molecular-level chemistry of brown carbon (BrC) is important in reducing the uncertainties in aerosol radiative forcing. Time-resolved ambient PM2.5 samples were collected during a severe pollution episode in January 2017 over Xi'an, China for a comprehensive nontarget and full scanning of BrC molecules and their absorption properties using electrospray ionization Fourier transform–ion cyclotron resonance mass spectrometry combined with partial least squares regression analysis, which apportioned the overall ultraviolet absorption to individual molecules. The estimated absorption of CHNO and CHNOS molecules exhibited nighttime prevalence, whereas CHOS, CHNS, CHN, CHO, CHS, and CH molecules presented a dynamic trend. Carbon conjugation was positively correlated with estimated absorption by CHO and CHNO molecules, while exhibiting a mixed relationship with CHNOS. Higher nitrogen content was associated with enhanced light-absorption properties of BrC molecules, while higher oxygen and sulfur content appeared to be associated with photobleaching during secondary transformation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Absorption spectroscopy; Atmospheric radiation; Carbon; Cyclotrons; Electron cyclotron resonance; Electrospray ionization; Least squares approximations; Light absorption; Mass spectrometry; Molecules; Photobleaching; Pollution; Regression analysis; Absorption property; Aerosol radiative forcing; Enhanced light absorptions; Ion cyclotron resonance mass spectrometry; Molecular absorption; Partial least squares regression analysis; Secondary transformation; Ultraviolet absorption; Bromine compounds; absorption; aerosol; bleaching; brown carbon; ionization; mass spectrometry; nitrogen; oxygen; particulate matter; regression analysis; sulfur; trend analysis; China; Shaanxi; Xian
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170357
作者单位	Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, China; ENAC/IIE Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland; 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 Branchs, Environment and Climate Change Canada, Toronto, ON, Canada; Sate Key Laboratory of Fluorine and Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, Xi'an, China
推荐引用方式 GB/T 7714	Zeng Y.,Shen Z.,Takahama S.,等. Molecular Absorption and Evolution Mechanisms of PM2.5 Brown Carbon Revealed by Electrospray Ionization Fourier Transform–Ion Cyclotron Resonance Mass Spectrometry During a Severe Winter Pollution Episode in Xi'an; China[J],2020,47(10).
APA	Zeng Y..,Shen Z..,Takahama S..,Zhang L..,Zhang T..,...&Rudolf H..(2020).Molecular Absorption and Evolution Mechanisms of PM2.5 Brown Carbon Revealed by Electrospray Ionization Fourier Transform–Ion Cyclotron Resonance Mass Spectrometry During a Severe Winter Pollution Episode in Xi'an; China.Geophysical Research Letters,47(10).
MLA	Zeng Y.,et al."Molecular Absorption and Evolution Mechanisms of PM2.5 Brown Carbon Revealed by Electrospray Ionization Fourier Transform–Ion Cyclotron Resonance Mass Spectrometry During a Severe Winter Pollution Episode in Xi'an; China".Geophysical Research Letters 47.10(2020).