Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China

doi:10.1016/j.scitotenv.2020.142600

IEECAS OpenIR > 粉尘与环境研究室

	Spectral absorption properties of organic carbon aerosol during a polluted winter in Beijing, China
	Wu, Yunfei 1; Li, Jiwei 1,2; Jiang, Chen 1,2; Xia, Yunjie 1,2; Tao, Jun 3; Tian, Ping 4; Zhou, Chang 1,2; Wang, Chaoying 1,2; Xia, Xiangao 1,6; Huang, Ru-jin 5; Zhang, Renjian 1,6
通讯作者	Wu, Yunfei(wuyf@mail.iap.ac.cn)
	2021-02-10
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	755 页码:13
摘要	A 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.
关键词	Spectral absorption properties Organic carbon Black carbon Size distribution
DOI	10.1016/j.scitotenv.2020.142600
关键词[WOS]	PARTICLE SOOT PHOTOMETER ; PARTICULATE BROWN CARBON ; IN-SITU AEROSOL ; LIGHT-ABSORPTION ; BLACK CARBON ; OPTICAL-PROPERTIES ; SOURCE APPORTIONMENT ; CHEMICAL-COMPOSITION ; MIXING STATE ; SOUTHEASTERN MARGIN
收录类别	SCI ; SCI
语种	英语
资助项目	National 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研究方向	Environmental Sciences & Ecology
项目资助者	National Key Research andDevelopment Program of China ; National Research Program for Key Issues in Air Pollution Control ; Natural Science Foundation of China
WOS类目	Environmental Sciences
WOS记录号	WOS:000600786700039
出版者	ELSEVIER
引用统计	被引频次：13[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/361006/15775
专题	粉尘与环境研究室
通讯作者	Wu, Yunfei
作者单位	1.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
推荐引用方式 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.