Journal ArticleDOI
Geometric-optics-integral-equation method for light scattering by nonspherical ice crystals.
Ping Yang,Kuo-Nan Liou +1 more
TLDR
It is demonstrated that the novel geometric-optics method can be applied to the computation of the extinction cross section and single-scattering albedo for ice crystals with size parameters along the minimum dimension as small as ~6 and overall agreement has been obtained for the phase function.Abstract:
A new geometric-optics model has been developed for the calculation of the single-scattering and polarization properties for arbitrarily oriented hexagonal ice crystals. The model uses the ray-tracing technique to solve the near field on the ice crystal surface, which is then transformed to the far field on the basis of the electromagnetic equivalence theorem. From comparisons with the results computed by the finite-difference time domain method, we show that the novel geometric-optics method can be applied to the computation of the extinction cross section and single-scattering albedo for ice crystals with size parameters along the minimum dimension as small as ~6. Overall agreement has also been obtained for the phase function when size parameters along the minimum dimension are larger than ~20. We demonstrate that the present model converges to the conventional ray-tracing method for large size parameters and produces single-scattering results close to those computed by the finite-difference time domain method for size parameters along the minimum dimension smaller than ~20. The present geometric-optics method can therefore bridge the gap between the conventional ray-tracing and the exact numerical methods that are applicable to large and small size parameters, respectively.read more
Citations
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Journal ArticleDOI
Variability of Absorption and Optical Properties of Key Aerosol Types Observed in Worldwide Locations
Oleg Dubovik,Brent N. Holben,Thomas F. Eck,Thomas F. Eck,Alexander Smirnov,Yoram J. Kaufman,Michael D. King,Didier Tanré,Ilya Slutsker +8 more
TL;DR: In this paper, the AERONET network of ground-based radiometers were used to remotely sense the aerosol absorption and other optical properties in several key locations, and the results showed robust differentiation in both the magnitude and spectral dependence of the absorption, a property driving aerosol climate forcing.
Journal ArticleDOI
The MODIS cloud products: algorithms and examples from Terra
Steven Platnick,Michael D. King,Steven A. Ackerman,W.P. Menzel,Bryan A. Baum,Jerome Riedi,Richard A. Frey +6 more
TL;DR: The various algorithms being used for the remote sensing of cloud properties from MODIS data with an emphasis on the pixel-level retrievals (referred to as Level-2 products), with 1-km or 5-km spatial resolution at nadir are described.
Journal ArticleDOI
Application of spheroid models to account for aerosol particle nonsphericity in remote sensing of desert dust
Oleg Dubovik,Oleg Dubovik,Alexander Sinyuk,Tatyana Lapyonok,Brent N. Holben,Michael I. Mishchenko,Ping Yang,Thomas F. Eck,Thomas F. Eck,Hester Volten,Olga Muñoz,Ben Veihelmann,Wim J. van der Zande,Jean-François Léon,Michael Sorokin,Ilya Slutsker +15 more
TL;DR: In this article, the authors used shape mixtures of randomly oriented spheroids for modeling desert dust aerosol light scattering, and the results indicated that nonspherical particles with aspect ratios similar to 1.5 dominate in desert dust plumes, while in the case of background maritime aerosol spherical particles are dominant.
Journal ArticleDOI
An Accurate Parameterization of the Infrared Radiative Properties of Cirrus Clouds for Climate Models
TL;DR: In this article, the extinction coefficient, absorption coefficient, and asymmetry factor are parameterized as functions of the cloud ice water content and generalized effective size, and validated by examining the bulk radiative properties for a wide range of atmospheric conditions.
Journal ArticleDOI
Global aerosol optical properties and application to Moderate Resolution Imaging Spectroradiometer aerosol retrieval over land
TL;DR: In this paper, the authors used the climatology of almucantur retrievals from global Aerosol Robotic Network (AERONET) Sun photometer sites to determine aerosol type as a function of location and season.
References
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Book
Computational Electrodynamics: The Finite-Difference Time-Domain Method
TL;DR: This paper presents background history of space-grid time-domain techniques for Maxwell's equations scaling to very large problem sizes defense applications dual-use electromagnetics technology, and the proposed three-dimensional Yee algorithm for solving these equations.
Journal ArticleDOI
Light Scattering by Small Particles
H. C. Van de Hulst,V. Twersky +1 more
TL;DR: Light scattering by small particles as mentioned in this paper, Light scattering by Small Particle Scattering (LPS), Light scattering with small particles (LSC), Light Scattering by Small Parts (LSP),
Book
Light Scattering by Small Particles
TL;DR: Light scattering by small particles as mentioned in this paper, Light scattering by Small Particle Scattering (LPS), Light scattering with small particles (LSC), Light Scattering by Small Parts (LSP),
Journal ArticleDOI
Discrete-Dipole Approximation For Scattering Calculations
Bruce T. Draine,Piotr J. Flatau +1 more
TL;DR: In this article, the authors used the discrete-dipole approximation (DDA) for scattering calculations, including the relationship between the DDA and other methods, including complex-conjugate gradient algorithms and fast-Fourier transform methods.