DOI: 10.1029/2012JD018751
论文题名: A combined laboratory and modeling study of the infrared extinction and visible light scattering properties of mineral dust aerosol
作者: Alexander J.M. ; Laskina O. ; Meland B. ; Young M.A. ; Grassian V.H. ; Kleiber P.D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 2 起始页码: 435
结束页码: 452
语种: 英语
Scopus关键词: Aerosols
; Computer simulation
; Dust
; Light scattering
; Minerals
; Mixtures
; Optical properties
; Sediments
; Size distribution
; Aerosol optical property
; Extinction spectra
; Linear polarization
; Mineral composition
; Mineral dust aerosol
; Scattering phase function
; Scattering property
; Simulated optical properties
; Particle size
; aerosol
; dust
; infrared radiation
; laboratory method
; matrix
; mineralogy
; numerical model
; optical property
; visible spectrum
; Iowa
; United States
英文摘要: Optical properties, including infrared (IR) extinction and visible light scattering of mineral dust aerosol, are measured experimentally and compared to modeling results using T-matrix theory. The work includes studies of complex, authentic field samples of Saharan sand, Iowa loess, and Arizona road dust (ARD). Particle size distributions and aerosol optical properties are measured simultaneously. These authentic dust samples are treated as external mixtures of mineral components. The mineral compositions for the Saharan sand and Iowa loess samples have been reported by Laskina et al. [2012], and the mineralogy for ARD is derived here using a similar method. T-matrix-based simulations, using measured particle size distributions and a priori particle shape models, are carried out for each mineral component of the authentic samples. The simulated optical properties for the complex dust mixtures are obtained by a weighted average of the properties of the mineral components, based on a given sample mineralogy. T-matrix simulations are then directly compared with the measured IR extinction spectra and visible light scattering phase function and linear polarization profiles for each sample. Generally good agreement between experiment and theory is obtained. Model simulations that account for differences in particle shape with mineralogy and include a broad range of eccentric spheroid shape parameters offer a significant improvement over more commonly applied models that ignore variations in particle shape with size or mineralogy and include only a moderate range of shape parameters. © 2012. American Geophysical Union. 资助项目: AGS-096824
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63997
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 Physics and Astronomy, University of Iowa, Iowa City, IA 52242, United States; Department of Chemistry, University of Iowa, Iowa City, IA, United States; Department of Mechanical Engineering, University of Colorado, Boulder, CO, United States
Recommended Citation:
Alexander J.M.,Laskina O.,Meland B.,et al. A combined laboratory and modeling study of the infrared extinction and visible light scattering properties of mineral dust aerosol[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(2)