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Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China
Li, Jianjun1,2; Zhang, Qi2; Wang, Gehui1,3,4; Li, Jin1; Wu, Can1,3; Liu, Lang1; Wang, Jiayuan1,2; Jiang, Wenqing2; Li, Lijuan1,2; Ho, Kin Fai1,5; Cao, Junji1
Corresponding AuthorZhang, Qi(dkwzhang@ucdavis.edu) ; Wang, Gehui(ghwang@geo.ecnu.edu.cn)
2020-04-27
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
Volume20Issue:8Pages:4889-4904
AbstractBrown 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.
DOI10.5194/acp-20-4889-2020
WOS KeywordLIGHT-ABSORPTION PROPERTIES ; SECONDARY ORGANIC AEROSOL ; BIOMASS-BURNING EMISSIONS ; CHEMICAL-CHARACTERIZATION ; AROMATIC-COMPOUNDS ; MASS-SPECTROMETRY ; REFRACTIVE-INDEX ; NEW-DELHI ; PHOTOOXIDATION ; XIAN
Indexed BySCI ; SCI
Language英语
Funding ProjectNational 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 Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
Funding OrganizationNational Nature Science Foundation of China ; Youth Innovation Promotion Association CAS
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000529394700001
PublisherCOPERNICUS GESELLSCHAFT MBH
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/14740
Collection粉尘与环境研究室
Corresponding AuthorZhang, Qi; Wang, Gehui
Affiliation1.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
Recommended Citation
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.
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