DOI: 10.1002/jgrd.50494
论文题名: Infrared extinction spectroscopy and micro-Raman spectroscopy of select components of mineral dust mixed with organic compounds
作者: Laskina O. ; Young M.A. ; Kleiber P.D. ; Grassian V.H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 6593
结束页码: 6606
语种: 英语
英文关键词: Atmospheric processing
; Infrared extinction
; Micro-Raman spectroscopy
; Mineral dust
; Optical properties
Scopus关键词: Aerosols
; Chemical analysis
; Doppler effect
; Fourier transform infrared spectroscopy
; Minerals
; Optical properties
; Organic acids
; Raman spectroscopy
; Scanning electron microscopy
; Atmospheric mineral dust
; Chemical interactions
; Fourier transform infrared
; Individual components
; Micro Raman Spectroscopy
; Mineral dust
; Online and offline analysis
; Radiative transfer calculations
; Dust
; aerosol
; algorithm
; analytical framework
; data acquisition
; dust
; infrared spectroscopy
; Mie theory
; organic compound
; Raman spectroscopy
; Rayleigh number
; sampling
; satellite imagery
; simulation
; spectral reflectance
英文摘要: Radiative transfer calculations as well as satellite and ground-based retrieval algorithms often use Mie theory to account for atmospheric mineral dust. However, the approximations used in Mie theory are often not appropriate for mineral dust and can lead to inaccuracies in modeling optical properties. Analytic models that are based on Rayleigh theory and account for particle shapes can offer significant advantages when used to model the IR extinction of mineral dust in the accumulation size mode. Here we extend our investigations of the IR optical properties of mineral dust to include samples that have been processed with organic acids. In particular, we aerosolize several individual components of mineral dust with organic compounds that are common in the atmosphere. Through online and offline analysis of the resulting aerosol particles combining Fourier transform infrared (FTIR) extinction spectroscopy, micro-Raman spectroscopy, and scanning electron microscopy, we have identified three distinct outcomes of the interactions, which depend on the nature of the mineral and the organic acid: reactions with segregation of the products within the particle, formation of a uniform coating on the particle, or a formation of external mixture when there is no significant chemical interaction. Analysis of FTIR extinction spectra of the different dust components that have undergone processing shows red shifts of the prominent IR resonance peaks. The extent of the red shift, which varies from 2 to 10 cm-1, depends on the mineral and the nature of the interaction. Spectral simulations showed that the deviation from Mie theory becomes even more pronounced for these processed mineral dust aerosol components. Key Points Nature of the mineral and acid determines outcomes of their interactions Deviation from Mie theory becomes more distinct for processed mineral dust Analytic solutions continue to fit the data for the processed particles better © 2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS096824
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63611
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Chemistry, University of Iowa, Iowa City, IA 52242, United States; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Recommended Citation:
Laskina O.,Young M.A.,Kleiber P.D.,et al. Infrared extinction spectroscopy and micro-Raman spectroscopy of select components of mineral dust mixed with organic compounds[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)