2009
DOI: 10.1029/2009jd012710
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T‐matrix studies of aerosol particle shape effects on IR resonance spectral line profiles and comparison with an experiment

Abstract: [1] Experimental infrared resonance absorption line profiles are compared with results from T-matrix theory calculations for several mineral components of atmospheric dust (illite, kaolinite, montmorillonite, quartz, and calcite). The model results are used to infer general characteristics of the aerosol particle shape distribution. For the silicate clays the spectral line profiles are best fit by a shape distribution of highly eccentric oblate spheroids, consistent with the expected sheet-like nature of the c… Show more

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Cited by 21 publications
(45 citation statements)
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“…Using then for simulations the shape-dependent analytic expressions for absorption peaks of small ellipsoids, disks and needles in the Rayleigh approximation [21], and assuming particles with isotropic orientations, they obtained a better agreement with their measurements than using the Mie calculations. In further developments using a T-matrix code, [30] could reach satisfactory agreement between the shapes of simulated peaks of extinction and the measurements on condition that high AR values be introduced (up to 10 for kaolinite, between 10 and 20 for illite and montmorillonite), while the particle 2-D AR measured using electron microscopy in the experiment, had values below 3 (consistently with the typical values found in the literature, obtained according to this technique).…”
Section: Introductionsupporting
confidence: 81%
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“…Using then for simulations the shape-dependent analytic expressions for absorption peaks of small ellipsoids, disks and needles in the Rayleigh approximation [21], and assuming particles with isotropic orientations, they obtained a better agreement with their measurements than using the Mie calculations. In further developments using a T-matrix code, [30] could reach satisfactory agreement between the shapes of simulated peaks of extinction and the measurements on condition that high AR values be introduced (up to 10 for kaolinite, between 10 and 20 for illite and montmorillonite), while the particle 2-D AR measured using electron microscopy in the experiment, had values below 3 (consistently with the typical values found in the literature, obtained according to this technique).…”
Section: Introductionsupporting
confidence: 81%
“…The fine mode is significantly affected by the assumption of spheres or spheroids ( [32], see Fig. 3; [33], see Fig. 14).…”
Section: Microphysical Propertiesmentioning
confidence: 99%
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“…The optical properties of mineral dust varies dramatically between minerals, specifically, the absorption terms (k, the imaginary term) in their complex refractive indices, which can range from 1.5 (typical of quartz and calcite) up to about 3.2 (typical of hematite) (Sokolik and Toon, 1999). For instance, iron (Fe) rich minerals and clays absorb short wave (visible and ultraviolet) radiation, whereas quartz and calcium (Ca) rich minerals absorb more long wave (infrared) radiation (Sokolik and Toon, 1999;Hudson et al, 2008a;Hudson et al, 2008b;Kleiber et al, 2009;Klueser et al, 2012;Laskina et al, 2012). Individual particles in the atmosphere are often mixtures of multiple minerals (Ault et al, 2012;Sobanska et al, 2012;Jung et al, 2014;Sobanska et al, 2014), which complicates understanding their specific optical properties.…”
Section: Introductionmentioning
confidence: 99%