气候变化领域集成服务门户(CCPortal): Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling

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DOI	10.1029/2021JD034616
	Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling
	Jiang H.; Li J.; Sun R.; Liu G.; Tian C.; Tang J.; Cheng Z.; Zhu S.; Zhong G.; Ding X.; Zhang G.
发表日期	2021
ISSN	2169897X
卷号	126 期号:9
英文摘要	The isotope tracer technique plays a key role in identifying the sources and atmospheric processes affecting pollution. The sources of brown carbon (BrC) at Guangzhou during 2017–2018 were characterized by positive matrix factorization with radiocarbon isotope constraints and multiple linear regression analysis. The primary emission factors of fossil fuel combustion (FF) and biomass burning (BB) accounted for 34% and 27% of dissolved BrC absorption at λ = 365 nm (Abs365), respectively. The total mean light absorption contributed by secondary sources was 39%. The FF-origin Abs365 changed insignificantly throughout the year and was dominant in the summer monsoon period, whereas the Abs365 from BB and secondary nitrate formation increased and contributed larger fractions during the winter monsoon period. Transported BrC was estimated using an index of 7Be/(7Be + n210Pb). Higher values were generally accompanied by lower Abs365, whereas lower values were associated with higher Abs365, indicating that BrC absorption of aerosols transported from the upper-atmosphere is lower than that of aerosols transported near the surface. Based on the positive correlations between 210Pb and Abs365 and non-fossil dissolved organic carbon in the winter monsoon period, we estimated that the contribution of invasive BrC (include ground and upper-atmosphere level) to total absorption during the period of elevated BrC was ∼50%. The transported BrC was likely related to BB organic aerosols and secondary nitrate formation processes. This study supports radionuclides as a novel method for characterizing the sources and transport of BrC that can be applied in future atmospheric research. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric dissolved organic matter; biomass burning; brown carbon; radionuclide tracers; regional transport; Source apportionment
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185234
作者单位	State Key Laboratory of Organic Geochemistry and Guangdong Province Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China; Department of Nuclear Science and Technology, College of Physics and Engineering, Shenzhen University, Shenzhen, China; Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China
推荐引用方式 GB/T 7714	Jiang H.,Li J.,Sun R.,et al. Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling[J],2021,126(9).
APA	Jiang H..,Li J..,Sun R..,Liu G..,Tian C..,...&Zhang G..(2021).Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling.Journal of Geophysical Research: Atmospheres,126(9).
MLA	Jiang H.,et al."Determining the Sources and Transport of Brown Carbon Using Radionuclide Tracers and Modeling".Journal of Geophysical Research: Atmospheres 126.9(2021).