HR: 0800h
AN: A41B-0440    [Abstracts]
TI: Light Scattering by Nonspherical ice Crystals: Comparison of Pseudo-spectral Time Domain and Discrete Dipole Approximation Methods
AU: * Bi, L
EM: bilei@tamu.edu
AF: Department of Physics, Texas A&M University, College Station, TX 77843, United States
AU: Chen, G
EM: chenguang@neo.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States
AU: Yang, P
EM: pyang@csrp.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States
AU: George, K
EM: kattawar@tamu.edu
AF: Department of Physics, Texas A&M University, College Station, TX 77843, United States
AB: We apply the pseudo-spectral time domain (PSTD) and discrete dipole approximation (DDA) methods for the solution to the scattering by randomly oriented ice crystals (hexagonal columns, plate, droxtals, bullet rosettes, and aggregates). The optical properties (extinction efficiency, single-scattering albedo, asymmetry factor and phase matrix) of these particles are calculated in the cases of small and moderate size parameters at wavelengths of 0.66 μ m and 12 μ m. The computational efficiency of these methods in terms of their demand on memory and CPU time is contrasted and analyzed. The configuration of particle random orientations in this study is specified with the help from the T-matrix method in the cases of spheroids and cylinders.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0360 Radiation: transmission and scattering
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting