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DOI	10.1029/2020JD034094
	Variation of Absorption Ångström Exponent in Aerosols From Different Emission Sources
	Helin A.; Virkkula A.; Backman J.; Pirjola L.; Sippula O.; Aakko-Saksa P.; Väätäinen S.; Mylläri F.; Järvinen A.; Bloss M.; Aurela M.; Jakobi G.; Karjalainen P.; Zimmermann R.; Jokiniemi J.; Saarikoski S.; Tissari J.; Rönkkö T.; Niemi J.V.; Timonen H.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	The absorption Ångström exponent (AAE) describes the spectral dependence of light absorption by aerosols. AAE is typically used to differentiate between different aerosol types for example., black carbon, brown carbon, and dust particles. In this study, the variation of AAE was investigated mainly in fresh aerosol emissions from different fuel and combustion types, including emissions from ships, buses, coal-fired power plants, and residential wood burning. The results were assembled to provide a compendium of AAE values from different emission sources. A dual-spot aethalometer (AE33) was used in all measurements to obtain the light absorption coefficients at seven wavelengths (370–950 nm). AAE470/950 varied greatly between the different emission sources, ranging from −0.2 ± 0.7 to 3.0 ± 0.8. The correlation between the AAE470/950 and AAE370-950 results was good (R2 = 0.95) and the mean bias error between these was 0.02. In the ship engine exhaust emissions, the highest AAE470/950 values (up to 2.0 ± 0.1) were observed when high sulfur content heavy fuel oil was used, whereas low sulfur content fuels had the lowest AAE470/950 (0.9–1.1). In the diesel bus exhaust emissions, AAE470/950 increased in the order of acceleration (0.8 ± 0.1), deceleration (1.1 ± 0.1), and steady driving (1.2 ± 0.1). In the coal-fired power plant emissions, the variation of AAE470/950 was substantial (from −0.1 ± 2.1 to 0.9 ± 1.6) due to the differences in the fuels and flue gas cleaning conditions. Fresh wood-burning derived aerosols had AAE470/950 from 1.1 ± 0.1 (modern masonry heater) to 1.4 ± 0.1 (pellet boiler), lower than typically associated with wood burning, while the burn cycle phase affected AAE variation. © 2021. The Authors.
英文关键词	absorption Ångström exponent; aethalometer, black carbon, emissions; 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/185188
作者单位	Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, Finland; Department of Technology, Metropolia University of Applied Sciences, Helsinki, Finland; Department of Physics, University of Helsinki, Helsinki, Finland; Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland; Department of Chemistry, University of Eastern Finland, Joensuu, Finland; VTT Technical Research Centre of Finland, Finland; Aerosol Physics Laboratory, Physics Unit, Tampere University, Tampere University, Finland; Joint Mass Spectrometry Centre, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München, Neuherberg, Germany; Helmholtz Virtual Institute for Complex Molecular Systems in Environmental Health, Neuherberg, Germany; Analytical Chemistry, Institute of Chemistry, University of Rostock, Rostock, Germany; Helsinki Region Environmental Services Authority, Helsinki, Finland
推荐引用方式 GB/T 7714	Helin A.,Virkkula A.,Backman J.,et al. Variation of Absorption Ångström Exponent in Aerosols From Different Emission Sources[J],2021,126(10).
APA	Helin A..,Virkkula A..,Backman J..,Pirjola L..,Sippula O..,...&Timonen H..(2021).Variation of Absorption Ångström Exponent in Aerosols From Different Emission Sources.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Helin A.,et al."Variation of Absorption Ångström Exponent in Aerosols From Different Emission Sources".Journal of Geophysical Research: Atmospheres 126.10(2021).