GSTDTAP  > 气候变化
DOI10.1002/2017JD027362
The Complex Refractive Index of Volcanic Ash Aerosol Retrieved From Spectral Mass Extinction
Reed, Benjamin E.1; Peters, Daniel M.1,2; McPheat, Robert2; Grainger, R. G.3
2018-01-27
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2018
卷号123期号:2页码:1339-1350
文章类型Article
语种英语
国家England
英文摘要

The complex refractive indices of eight volcanic ash samples, chosen to have a representative range of SiO2 contents, were retrieved from simultaneous measurements of their spectral mass extinction coefficient and size distribution. The mass extinction coefficients, at 0.33-19m, were measured using two optical systems: a Fourier transform spectrometer in the infrared and two diffraction grating spectrometers covering visible and ultraviolet wavelengths. The particle size distribution was measured using a scanning mobility particle sizer and an optical particle counter; values for the effective radius of ash particles measured in this study varied from 0.574 to 1.16m. Verification retrievals on high-purity silica aerosol demonstrated that the Rayleigh continuous distribution of ellipsoids (CDEs) scattering model significantly outperformed Mie theory in retrieving the complex refractive index, when compared to literature values. Assuming the silica particles provided a good analogue of volcanic ash, the CDE scattering model was applied to retrieve the complex refractive index of the eight ash samples. The Lorentz formulation of the complex refractive index was used within the retrievals as a convenient way to ensure consistency with the Kramers-Kronig relation. The short-wavelength limit of the electric susceptibility was constrained by using independently measured reference values of the complex refractive index of the ash samples at a visible wavelength. The retrieved values of the complex refractive indices of the ash samples showed considerable variation, highlighting the importance of using accurate refractive index data in ash cloud radiative transfer models.


英文关键词volcanic ash complex refractive index aerosol optical properties Rayleigh CDE model mass extinction spectra scattering theory
领域气候变化
收录类别SCI-E
WOS记录号WOS:000425520200042
WOS关键词SIZE DISTRIBUTION MEASUREMENTS ; OPTICAL-PROPERTIES ; LIGHT-SCATTERING ; PARTICLES ; CLOUDS ; QUARTZ ; DUST ; RISK ; COMPONENTS ; SPHEROIDS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/32491
专题气候变化
作者单位1.Univ Oxford, Atmospher, Ocean & Planetary Phys, Oxford, England;
2.STFC Rutherford Appleton Lab, RAL Space, Harwell, Berks, England;
3.Univ Oxford, COMET, Atmospher, Ocean & Planetary Phys, Oxford, England
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GB/T 7714
Reed, Benjamin E.,Peters, Daniel M.,McPheat, Robert,et al. The Complex Refractive Index of Volcanic Ash Aerosol Retrieved From Spectral Mass Extinction[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(2):1339-1350.
APA Reed, Benjamin E.,Peters, Daniel M.,McPheat, Robert,&Grainger, R. G..(2018).The Complex Refractive Index of Volcanic Ash Aerosol Retrieved From Spectral Mass Extinction.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(2),1339-1350.
MLA Reed, Benjamin E.,et al."The Complex Refractive Index of Volcanic Ash Aerosol Retrieved From Spectral Mass Extinction".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.2(2018):1339-1350.
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