气候变化领域集成服务门户(CCPortal): Complex refractive indices in the ultraviolet and visible spectral region for highly absorbing non-spherical biomass burning aerosol

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DOI	10.5194/acp-21-7235-2021
	Complex refractive indices in the ultraviolet and visible spectral region for highly absorbing non-spherical biomass burning aerosol
	Womack C.C.; Manfred K.M.; Wagner N.L.; Adler G.; Franchin A.; Lamb K.D.; Middlebrook A.M.; Schwarz J.P.; Brock C.A.; Brown S.S.; Washenfelder R.A.
发表日期	2021
ISSN	1680-7316
起始页码	7235
结束页码	7252
卷号	21 期号:9
英文摘要	Biomass burning aerosol is a major source of PM2.5, and significantly affects Earth's radiative budget. The magnitude of its radiative effect is poorly quantified due to uncertainty in the optical properties of aerosol formed from biomass burning. Using a broadband cavity-enhanced spectrometer with a recently increased spectral range (360-720 nm) coupled to a size-selecting aerosol inlet, we retrieve complex refractive indices of aerosol throughout the near-ultraviolet and visible spectral region. We demonstrate refractive index retrievals for two standard aerosol samples: polystyrene latex spheres and ammonium sulfate. We then retrieve refractive indices for biomass burning aerosol from 13 controlled fires during the 2016 Missoula Fire Science Laboratory Study. We demonstrate that the technique is highly sensitive to the accuracy of the aerosol size distribution method and find that while we can constrain the optical properties of brown carbon aerosol for many fires, fresh smoke dominated by fractal-like black carbon aerosol presents unique challenges and is not well-represented by Mie theory. For the 13 fires, we show that the accuracy of Mie theory retrievals decreases as the fraction of black carbon mass increases. At 475 nm, the average refractive index is 1.635 (±0:056) C0:06 (±0:12)i, and at 365 nm, the average refractive index is 1.605 (±0:041) C0:038 (±0:074)i. © 2021 Author(s).
语种	英语
scopus关键词	aerosol; biomass burning; particulate matter; refractive index; size distribution; spectral analysis
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246897
作者单位	Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States; Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States; Department of Chemistry, University of Colorado, Boulder, CO 80309, United States; Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, United Kingdom; Ball Aerospace, Broomfield, CO 80021, United States; Breezometer, Haifa, Israel; National Center for Atmospheric Research, Boulder, CO 80305, United States; Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, United States
推荐引用方式 GB/T 7714	Womack C.C.,Manfred K.M.,Wagner N.L.,et al. Complex refractive indices in the ultraviolet and visible spectral region for highly absorbing non-spherical biomass burning aerosol[J],2021,21(9).
APA	Womack C.C..,Manfred K.M..,Wagner N.L..,Adler G..,Franchin A..,...&Washenfelder R.A..(2021).Complex refractive indices in the ultraviolet and visible spectral region for highly absorbing non-spherical biomass burning aerosol.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(9).
MLA	Womack C.C.,et al."Complex refractive indices in the ultraviolet and visible spectral region for highly absorbing non-spherical biomass burning aerosol".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.9(2021).