Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China

doi:10.5194/acp-20-4889-2020

IEECAS OpenIR > 粉尘与环境研究室

	Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China
	Li, Jianjun 1,2; Zhang, Qi 2; Wang, Gehui 1,3,4; Li, Jin 1; Wu, Can 1,3; Liu, Lang 1; Wang, Jiayuan 1,2; Jiang, Wenqing 2; Li, Lijuan 1,2; Ho, Kin Fai 1,5; Cao, Junji 1
通讯作者	Zhang, Qi(dkwzhang@ucdavis.edu) ; Wang, Gehui(ghwang@geo.ecnu.edu.cn)
	2020-04-27
发表期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN	1680-7316
卷号	20 期号:8 页码:4889-4904
摘要	Brown carbon (BrC) contributes significantly to aerosol light absorption and thus can affect the Earth's radiation balance and atmospheric photochemical processes. In this study, we examined the light absorption properties and molecular compositions of water-soluble (WS-BrC) and water-insoluble (WI-BrC) BrC in PM2.5 collected from a rural site in the Guanzhong Basin - a highly polluted region in northwest China. Both WS-BrC and WI-BrC showed elevated light absorption coefficients (Abs) in winter (4-7 times those in summer) mainly attributed to enhanced emissions from residential biomass burning (BB) for heating of homes. While the average mass absorption coefficients (MACs) at 365 nm (MAC(365)) of WS-BrC were similar between daytime and nighttime in summer (0.99 +/- 0.17 and 1.01 +/- 0.18 m(2) g(-1), respectively), the average MAC(365) of WI-BrC was more than a factor of 2 higher during daytime (2.45 +/- 1.14 m(2) g(-1)) than at night (1.18 +/- 0.36 m(2) g(-1)). This difference was partly attributed to enhanced photochemical formation of WI-BrC species, such as oxygenated polycyclic aromatic hydrocarbons (OPAHs). In contrast, the MACs of WS-BrC and WI-BrC were generally similar in winter and both showed few diel differences. The Abs of wintertime WS-BrC correlated strongly with relative humidity, sulfate and NO2, suggesting that aqueous-phase reaction is an important pathway for secondary BrC formation during the winter season in northwest China. Nitrophenols on average contributed 2.44 +/- 1.78% of the Abs of WS-BrC in winter but only 0.12 +/- 0.03% in summer due to faster photodegradation reactions. WS-BrC and WI-BrC were estimated to account for 0.83 +/- 0.23% and 0.53 +/- 0.33 %, respectively, of the total down-welling solar radiation in the ultraviolet (UV) range in summer, and 1.67 +/- 0.72% and 2.07 +/- 1.24 %, respectively, in winter. The total absorption by BrC in the UV region was about 55 %-79% relative to the elemental carbon (EC) absorption.
DOI	10.5194/acp-20-4889-2020
关键词[WOS]	LIGHT-ABSORPTION PROPERTIES ; SECONDARY ORGANIC AEROSOL ; BIOMASS-BURNING EMISSIONS ; CHEMICAL-CHARACTERIZATION ; AROMATIC-COMPOUNDS ; MASS-SPECTROMETRY ; REFRACTIVE-INDEX ; NEW-DELHI ; PHOTOOXIDATION ; XIAN
收录类别	SCI ; SCI
语种	英语
资助项目	National Nature Science Foundation of China[41773117] ; National Nature Science Foundation of China[91644102] ; National Nature Science Foundation of China[41977332] ; National Nature Science Foundation of China[91543116] ; Youth Innovation Promotion Association CAS[2020407]
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
项目资助者	National Nature Science Foundation of China ; Youth Innovation Promotion Association CAS
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000529394700001
出版者	COPERNICUS GESELLSCHAFT MBH
引用统计	被引频次：43[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/14740
专题	粉尘与环境研究室
通讯作者	Zhang, Qi; Wang, Gehui
作者单位	1.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China 2.Univ Calif Davis, Dept Environm Toxicol, Davis, CA 95616 USA 3.East China Normal Univ, Sch Geog Sci, Minist Educ, Key Lab Geog Informat Sci, Shanghai 200241, Peoples R China 4.Inst Ecochongming, 3663 N Zhongshan Rd, Shanghai 200062, Peoples R China 5.Chinese Univ Hong Kong, Jockey Club Sch Publ Hlth & Primary Care, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Li, Jianjun,Zhang, Qi,Wang, Gehui,et al. Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(8):4889-4904.
APA	Li, Jianjun.,Zhang, Qi.,Wang, Gehui.,Li, Jin.,Wu, Can.,...&Cao, Junji.(2020).Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(8),4889-4904.
MLA	Li, Jianjun,et al."Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.8(2020):4889-4904.