globalchange  > 气候变化与战略
DOI: 10.1016/j.envpol.2019.113616
论文题名:
Light absorption, fluorescence properties and sources of brown carbon aerosols in the Southeast Tibetan Plateau
作者: Wu G.; Wan X.; Ram K.; Li P.; Liu B.; Yin Y.; Fu P.; Loewen M.; Gao S.; Kang S.; Kawamura K.; Wang Y.; Cong Z.
刊名: Environmental Pollution
ISSN: 2697491
出版年: 2020
卷: 257
语种: 英语
Scopus关键词: Aerosols ; Carbon ; Chromophores ; Fluorescence ; Global warming ; Light absorption ; Optical properties ; Absorption property ; Backward trajectory analysis ; Biomass burning emissions ; Driving factors ; Fluorescence properties ; Long range transport ; Organic tracers ; Tibetan Plateau ; Bromine compounds ; brown carbon ; industrial chemical ; absorbance ; aerosol ; brown carbon ; fluorescence ; global warming ; light ; source apportionment ; aerosol ; air analysis ; air quality ; altitude ; atmospheric deposition ; biomass ; climate change ; controlled study ; environmental impact ; fluorescence ; greenhouse effect ; light absorption ; seasonal variation ; summer ; Tibet ; winter ; China ; Qinghai-Xizang Plateau
英文摘要: Brown carbon (BrC) has been proposed as an important driving factor in climate change due to its light absorption properties. However, our understanding of BrC's chemical and optical properties are inadequate, particularly at remote regions. This study conducts a comprehensive investigation of BrC aerosols in summer (Aug. 2013) and winter (Jan. 2014) at Southeast Tibetan Plateau, which is ecologically fragile and sensitive to global warming. The concentrations of methanol-soluble BrC (MeS-BrC) are approximately twice of water-soluble BrC (WS-BrC), demonstrating the environmental importance of water-insoluble BrC are previously underestimated with only WS-BrC considered. The mass absorption efficiency of WS-BrC (0.27–0.86 m2 g−1) is lower than those in heavily polluted South Asia, indicating a distinct contrast between the two sides of Himalayas. Fluorescence reveals that the absorption of BrC is mainly attributed to humic-like and protein-like substances, which broaden the current knowledge of BrC's chromophores. Combining organic tracer, satellite MODIS data and air-mass backward trajectory analysis, this study finds BrC is mainly derived from bioaerosols and secondary formation in summer, while long-range transport of biomass burning emissions in winter. Our study provides new insights into the optical and chemical properties of BrC, which may have implications for environmental effect and sources of organic aerosols. Optical properties and organic tracers demonstrate that BrC is derived from bioaerosols in summer, while biomass burning emissions in winter. © 2019 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159635
Appears in Collections:气候变化与战略

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作者单位: Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing, 100101, China; Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi, 221005, India; Chongqing Jinfo Mountain Field Scientific Observation and Research Station for Kaster Ecosystem, School of Geographical Sciences, Southwest University, Chongqing, 400715, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, CAS, Beijing, 100085, China; Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China; State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou, 730000, China; Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan; Center for Excellence in Tibetan Plateau Earth Sciences, CAS, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China

Recommended Citation:
Wu G.,Wan X.,Ram K.,et al. Light absorption, fluorescence properties and sources of brown carbon aerosols in the Southeast Tibetan Plateau[J]. Environmental Pollution,2020-01-01,257
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