气候变化领域集成服务门户(CCPortal): Light absorption of brown carbon in PM2.5 in the Three Gorges Reservoir region, southwestern China: Implications of biomass burning and secondary formation

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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 C.; Tian M.; Wang X.; Yang F.; Shi G.; Huang R.-J.; Yao X.; Wang Q.; Zhai C.; Zhang S.; Qian R.; Cao J.; Chen Y.
发表日期	2020
ISSN	1352-2310
卷号	229
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 (βabs, 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 βabs,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 (MAE405,BrC) was 0.8 ± 0.4 m2 g−1 during winter which was 2.7 times higher than that during summer (0.3 ± 0.1 m2 g−1). Furthermore, the absorption Ångström exponents (AAE) at 405–980 nm (AAE405−980) 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 βabs,405,BrC during winter. Additionally, the relatively high AAE405−980 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. © 2020 Elsevier Ltd
关键词	Biomass burning Brown carbon Light absorption Three gorges reservoir
语种	英语
scopus关键词	Aerosols; Atmospheric radiation; Budget control; Carbon; Light absorption; Optical properties; Solar energy; Urban growth; Aerosol light absorption; Correlation analysis; Light absorption coefficients; Mass absorption; Radiative forcings; Secondary organic aerosols; Three gorges reservoir; Three Gorges Reservoir region; Bromine compounds; ammonia; brown carbon; nitrate; organic carbon; unclassified drug; absorption; absorption coefficient; absorption efficiency; aerosol; brown carbon; light effect; optical property; particulate matter; radiative forcing; troposphere; urban area; Article; biomass; China; high temperature; light absorption; optics; particulate matter; priority journal; procedures; seasonal variation; secondary organic aerosol; solar energy; solar radiation; summer; thermal analysis; ultraviolet radiation; winter; China; Three Gorges Reservoir
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249216
作者单位	Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States; National Engineering Research Center for Flue Gas Desulfurization, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China; School of Environment and Ecology, Chongqing University, Chongqing, 400044, China; State Key Laboratory of Loess and Quaternary Geology (SKLLQG), and Key Laboratory of Aerosol Chemistry and Physics (KLACP), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China; Chongqing Academy of Environmental Science, Chongqing, 401147, China; School of Basic Medical Sciences, North Sichuan Medical College, Nanchong, Sichuan 637000, China
推荐引用方式 GB/T 7714	Peng C.,Tian M.,Wang X.,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],2020,229.
APA	Peng C..,Tian M..,Wang X..,Yang F..,Shi G..,...&Chen Y..(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.
MLA	Peng C.,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).