Light absorption of brown carbon in PM2.5 in the Three Gorges Reservoir region, southwestern China: Implications of biomass burning and secondary formation

doi:10.1016/j.atmosenv.2020.117409

	Light absorption of brown carbon in PM2.5 in the Three Gorges Reservoir region, southwestern China: Implications of biomass burning and secondary formation
	Peng, Chao 1,8; Tian, Mi 4,8; Wang, Xiaoliang 2; Yang, Fumo 3,8; Shi, Guangming 3,8; Huang, Ru-Jin 5; Yao, Xiaojiang 8; Wang, Qiyuan 5; Zhai, Chongzhi 6; Zhang, Shumin 7
刊名	ATMOSPHERIC ENVIRONMENT
	2020-05-15
卷号	229 页码:12
关键词	Brown carbon Light absorption Biomass burning Three gorges reservoir
ISSN号	1352-2310
DOI	10.1016/j.atmosenv.2020.117409
通讯作者	Yang, Fumo(fmyang@scu.edu.cn) ; Chen, Yang(chenyang@cigit.ac.cn)
英文摘要	Brown carbon (BrC) is known as a light-absorbing organic aerosol which affects the visibility and radiative forcing budget in the troposphere. The optical properties were studied for filter-based PM2.5 samples collected from the winter of 2015 to the summer of 2016 at one rural and three urban sites in the Three Gorges Reservoir (TGR) region, China. The average light absorption coefficient for BrC (beta(abs,405, BrC)) at 405 nm and its contributions to total aerosol light absorption during winter were 12.1 +/- 7.0 Mm(-1) and 23.8 +/- 9.1% respectively, higher than those during summer (1.7 +/- 0.8 Mm(-1) and 11.2 +/- 4.1%). Spatially, the average beta(abs,405, BrC) was higher at the urban sites (13.4 +/- 7.3 Mm(-1)) than that at the rural site (7.8 +/- 3.2 Mm(-1)). The average mass absorption efficiency of BrC at 405 nm (MAE(405),(BrC)) was 0.8 +/- 0.4 m(2) g(-1) during winter which was 2.7 times higher than that during summer (0.3 +/- 0.1 m(2) g(-1)). Furthermore, the absorption Angstrom exponents (AAE) at 405-980 nm (AAE(405-980)) were 1.1 +/- 0.1 in summer and 1.3 +/- 0.2 in winter respectively. Correlation analysis suggests that biomass burning (BB) played an important role in beta(abs,405, BrC) during winter. Additionally, the relatively high AAE(405_980) during winter was mainly due to the BrC from both BB and secondary organic aerosol. The fractional contribution of solar energy absorption by BrC relative to BC in the wavelengths of 405-445 nm was 23.9 +/- 7.8% in summer and 63.7 +/- 14.2% in winter, significantly higher than that in the range of 405-980 nm (11.9 +/- 3.4% and 29.9 +/- 6.1% respectively). Overall, this study contributes to the understanding of sources of BrC in the climate-sensitive TGR region of southwestern China.
资助项目	National Key Research and Development Program of China[2016YFC0200405] ; National Key Research and Development Program of China[2018YFC0200402] ; National Natural Science Foundation of China[41375123] ; National Natural Science Foundation of China[81571130100]
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000530031600002
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/10948]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Yang, Fumo; Chen, Yang
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Desert Res Inst, Div Atmospher Sci, Reno, NV USA 3.Sichuan Univ, Coll Architecture & Environm, Natl Engn Res Ctr Flue Gas Desulfurizat, Chengdu 610065, Peoples R China 4.Chongqing Univ, Sch Environm & Ecol, Chongqing 400044, Peoples R China 5.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Key Lab Aerosol Chem & Phys, Xian 710075, Peoples R China 6.Chongqing Acad Environm Sci, Chongqing 401147, Peoples R China 7.North Sichuan Med Coll, Sch Basic Med Sci, Nanchong 637000, Sichuan, Peoples R China 8.Chinese Acad Sci, Res Ctr Atmospher Environm, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
推荐引用方式 GB/T 7714	Peng, Chao,Tian, Mi,Wang, Xiaoliang,et al. Light absorption of brown carbon in PM2.5 in the Three Gorges Reservoir region, southwestern China: Implications of biomass burning and secondary formation[J]. ATMOSPHERIC ENVIRONMENT,2020,229:12.
APA	Peng, Chao.,Tian, Mi.,Wang, Xiaoliang.,Yang, Fumo.,Shi, Guangming.,...&Chen, Yang.(2020).Light absorption of brown carbon in PM2.5 in the Three Gorges Reservoir region, southwestern China: Implications of biomass burning and secondary formation.ATMOSPHERIC ENVIRONMENT,229,12.
MLA	Peng, Chao,et al."Light absorption of brown carbon in PM2.5 in the Three Gorges Reservoir region, southwestern China: Implications of biomass burning and secondary formation".ATMOSPHERIC ENVIRONMENT 229(2020):12.