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Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China
Wu, Yunfei1; Li, Jiwei1,2; Jiang, Chen1,2; Xia, Yunjie1,2; Tao, Jun3; Tian, Ping4; Zhou, Chang1,2; Wang, Chaoying1,2; Xia, Xiangao1,6; Huang, Ru-jin5; Zhang, Renjian1,6
Corresponding AuthorWu, Yunfei(wuyf@mail.iap.ac.cn)
2021-02-10
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume755Pages:13
AbstractA fraction of organic carbon (OC) is found to exhibit the capability to absorb solar radiation. However, the absorption properties of OC remain poorly characterized partly due to uncertainties in determination methods. In this study, the absorption coefficient (b(ap)) of OC (b(ap,OC)) in Beijing during a polluted winter was estimated on the basis of the combined measurements of black carbon (BC) size distribution and total aerosol b(ap) (b(ap,meas)). The bare BC b(ap) (b(ap,bareBC)) calculated using Mie theory on the basis of measured size distribution exhibited weak wavelength dependence, with a mean absorption Angstrom exponent (AAE) of 0.56 +/- 0.04 within the 470-660 nm wavelength range, which was lower than the value of 1 commonly used for freshly emitted BC. The calculated b(ap,bareBC) was compared with b(ap,meas) at 950 nm to derive the coating thickness of BC, from which the calculation of coated BC b(ap) (b(ap,coatBC)) within 370-660 nm was based using the core-shell Mie model. Given the thick coatings, the AAE of coated BC, with a mean of 0.53 +/- 0.12, was slightly lower than that of bare BC. Subsequently, b(ap,OC) was obtained by subtracting b(ap,coatBC) from bap,meas, accounting for 59.57 +/- 4.82% of bap,meas at 370 nm on average. The average mass absorption efficiency of OC was estimated to be 1.48 +/- 0.36 m(2) g(-1) at 370 nm. b(ap,OC) significantly decreased as wavelength increased, deriving an AAE of OC with a mean of 2.72 +/- 0.32 within the 370-660 nm range. The level of b(ap,OC) estimated on the basis of a widely used attribution method assuming a constant BC AAE of 1 was similar to 60% lower than the currently presented value, probably underestimating OC radiative effect by a factor of >3. More accurate estimations of b(ap,OC) based on more advanced measurements and suitable theory calculations are recommended to provide more reliable assessments of OC radiative effects. (C) 2020 Elsevier B.V. All rights reserved.
KeywordSpectral absorption properties Organic carbon Black carbon Size distribution
DOI10.1016/j.scitotenv.2020.142600
WOS KeywordPARTICLE SOOT PHOTOMETER ; PARTICULATE BROWN CARBON ; IN-SITU AEROSOL ; LIGHT-ABSORPTION ; BLACK CARBON ; OPTICAL-PROPERTIES ; SOURCE APPORTIONMENT ; CHEMICAL-COMPOSITION ; MIXING STATE ; SOUTHEASTERN MARGIN
Indexed BySCI ; SCI
Language英语
Funding ProjectNational Key Research andDevelopment Program of China[2017YFC0209601] ; National Key Research andDevelopment Program of China[2019YFA0606801] ; National Research Program for Key Issues in Air Pollution Control[DQGG0105] ; Natural Science Foundation of China[41575150] ; Natural Science Foundation of China[41775155] ; Natural Science Foundation of China[91644217]
WOS Research AreaEnvironmental Sciences & Ecology
Funding OrganizationNational Key Research andDevelopment Program of China ; National Research Program for Key Issues in Air Pollution Control ; Natural Science Foundation of China
WOS SubjectEnvironmental Sciences
WOS IDWOS:000600786700039
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/15775
Collection粉尘与环境研究室
Corresponding AuthorWu, Yunfei
Affiliation1.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Minist Ecol & Environm, South China Inst Environm Sci, Guangzhou 510530, Peoples R China
4.Beijing Weather Modificat Off, Beijing 100089, Peoples R China
5.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China
6.Chinese Acad Sci, Xianghe Observ Whole Atmosphere, Inst Atmospher Phys, Xianghe 065400, Peoples R China
Recommended Citation
GB/T 7714
Wu, Yunfei,Li, Jiwei,Jiang, Chen,et al. Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,755:13.
APA Wu, Yunfei.,Li, Jiwei.,Jiang, Chen.,Xia, Yunjie.,Tao, Jun.,...&Zhang, Renjian.(2021).Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China.SCIENCE OF THE TOTAL ENVIRONMENT,755,13.
MLA Wu, Yunfei,et al."Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China".SCIENCE OF THE TOTAL ENVIRONMENT 755(2021):13.
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