HR: 0800h
AN: A41B-0430    [Abstracts]
TI: Modeling of Single Scattering by Inhomogeneous Hexagonal Ice Crystals
AU: * Xie, Y
EM: xieyu@ariel.met.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States
AU: Yang, P
EM: pyang@ariel.met.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, United States
AU: Kattawar, G
EM: kattawar@tamu.edu
AF: Department of Physics, Texas A&M University, College Station, TX 77843, United States
AB: Spherical or spheroidal air bubbles are generally trapped before escaping from rapidly growing ice crystals. The intent of this effort is to study the effect of the number, shape, size and location of the air bubbles inside hexagonal ice crystals on the single-scattering properties of these ice crystals. A theoretical model based on the geometric-optics method has been developed to simulate the scattering of light by randomly oriented ice crystals in the form of hexagonal ice columns containing spherical or spheroidal air bubbles. In this model, a combination of the ray-tracing technique and the Monte Carlo method is used. Our preliminary results indicate that the air bubbles inside ice crystals may lead to smooth phase functions and decrease the 22° and 46° halo peaks. Moreover, the backscattering is substantially reduced for the inhomogeneous particles, which physically is because of the divergence of light beams after their interactions with the air bubbles. These features become more pronounced with increasing the number and sizes of the air bubbles.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0319 Cloud optics
DE: 0320 Cloud physics and chemistry
DE: 0360 Radiation: transmission and scattering
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting