Impact of morphological parameters onto simulated light scattering patterns

Skorupski, Krzysztof; Mroczka, Janusz; Riefler, Norbert; Oltmann, Hergen; Will, Stefan; Wriedt, Thomas

doi:10.1016/j.jqsrt.2012.12.014

Cited by 40 publications

(12 citation statements)

References 38 publications

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“…Furthermore, light based techniques can be used to study different structures, like erythrocytes or fibres [27][28][29][30][31][32]. In this study primary particles, characterized by the diameter of dp=30 nm, were not overlapping and there was no neck between them [33,34]. For DDA simulations M2, M3 and M5 meshes were used.…”

Section: Resultsmentioning

confidence: 99%

Using the DDA (Discrete Dipole Approximation) Method in Determining the Extinction Cross Section of Black Carbon

Skorupski¹

2015

Metrology and Measurement Systems

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BC (Black Carbon), which can be found in the atmosphere, is characterized by a large value of the imaginary part of the complex refractive index and, therefore, might have an impact on the global warming effect. To study the interaction of BC with light often computer simulations are used. One of the methods, which are capable of performing light scattering simulations by any shape, is DDA (Discrete Dipole Approximation). In this work its accuracy was estimated in respect to BC structures using the latest stable version of the ADDA (vr. 1.2) algorithm. As the reference algorithm the GMM (Generalized Multiparticle Mie-Solution) code was used. The study shows that the number of volume elements (dipoles) is the main parameter that defines the quality of results. However, they can be improved by a proper polarizability expression. The most accurate, and least time consuming, simulations were observed for IGT_SO. When an aggregate consists of particles composed of ca. 750 volume elements (dipoles), the averaged relative extinction error should not exceed ca. 4.5%.

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Section: Resultsmentioning

confidence: 99%

Using the DDA (Discrete Dipole Approximation) Method in Determining the Extinction Cross Section of Black Carbon

Skorupski¹

2015

Metrology and Measurement Systems

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“…The (superposition) T-matrix method (TMM) [46,[49][50][51][52][53][54][55] and the discrete dipole approximation (DDA) [56,57] (or the closely related volume integral equation formulation [58,59]) appear to be the most frequently used techniques, as exemplified by Refs. and [87][88][89][90][91][92][93][94][95], respectively. However, other approaches such as the finite difference time domain method (FDTDM), the pseudo-spectral time domain method, and the finite element-boundary integral technique are also gaining popularity [96][97][98][99][100][101][102][103][104].…”

Section: Introductionmentioning

confidence: 99%

“…However, the results of Ref. [87] suggest that the effect of sintering on the scattering and absorption properties of soot aggregates is likely to be insignificant.…”

Section: Introductionmentioning

confidence: 99%

T-matrix modeling of linear depolarization by morphologically complex soot and soot-containing aerosols

Mishchenko

Liu

Mackowski

2013

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tWe use state-of-the-art public-domain Fortran codes based on the T-matrix method to calculate orientation and ensemble averaged scattering matrix elements for a variety of morphologically complex black carbon (BC) and BC-containing aerosol particles, with a special emphasis on the linear depolarization ratio (LDR). We explain theoretically the quasi-Rayleigh LDR peak at side-scattering angles typical of low-density soot fractals and conclude that the measurement of this feature enables one to evaluate the compactness state of BC clusters and trace the evolution of low-density fluffy fractals into densely packed aggregates. We show that small backscattering LDRs measured with groundbased, airborne, and spaceborne lidars for fresh smoke generally agree with the values predicted theoretically for fluffy BC fractals and densely packed near-spheroidal BC aggregates. To reproduce higher lidar LDRs observed for aged smoke, one needs alternative particle models such as shape mixtures of BC spheroids or cylinders.Published by Elsevier Ltd.

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“…More information about fractal-like aggregates and their optical properties can be found elsewhere. 6,12 In this work, the morphological parameters of BC aggregates were: D f = 2.2, k f = 0.8 and r p = 15nm. Selected values were based on different measurements which can be found in the literature, e.g.…”

Section: Introductionmentioning

confidence: 91%

The optical properties of tropospheric soot aggregates determined with the DDA (Discrete Dipole Approximation) method

Skorupski

2015

SPIE Proceedings

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Black carbon particles soon after emission interact with organic and inorganic matter. The primary goal of this work was to approximate the accuracy of the DDA method in determining the optical properties of such composites. For the light scattering simulations the ADDA code was selected and the superposition T-Matrix code by Mackowski was used as the reference algorithm. The first part of the study was to compare alternative models of a single primary particle. When only one material is considered the largest averaged relative extinction error is associated with black carbon (δC ext ≈ 2.8%). However, for inorganic and organic matter it is lowered to δC ext ≈ 0.75%. There is no significant difference between spheres and ellipsoids with the same volume, and therefore, both of them can be used interchangeably. The next step was to investigate aggregates composed of N p = 50 primary particles. When the coating is omitted, the averaged relative extinction error is δC ext ≈ 2.6%. Otherwise, it can be lower than δC ext < 0.2%.

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Impact of morphological parameters onto simulated light scattering patterns

Cited by 40 publications

References 38 publications

Using the DDA (Discrete Dipole Approximation) Method in Determining the Extinction Cross Section of Black Carbon

Using the DDA (Discrete Dipole Approximation) Method in Determining the Extinction Cross Section of Black Carbon

T-matrix modeling of linear depolarization by morphologically complex soot and soot-containing aerosols

The optical properties of tropospheric soot aggregates determined with the DDA (Discrete Dipole Approximation) method

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