期刊
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
卷 112, 期 9, 页码 1492-1508出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2011.02.015
关键词
Light scattering; Geometric optics; Physical optics; Hexagonal ice crystal
资金
- NASA High-End Computing (HEC) [SMD-09-1413]
- NASA [NNX08AF68G, NNX08AI94G]
- National Science Foundation (NSF) [ATM-0803779]
- Office of Naval Research [N00014-06-1-0069]
- NASA ROSES [NNX08AF81G]
- NASA [100202, NNX08AF81G, 101003, NNX08AI94G] Funding Source: Federal RePORTER
A new physical-geometric optics hybrid (PGOH) method is developed to compute the scattering and absorption properties of ice particles. This method is suitable for studying the optical properties of ice particles with arbitrary orientations, complex refractive indices (i.e., particles with significant absorption), and size parameters (proportional to the ratio of particle size to incident wavelength) larger than similar to 20, and includes consideration of the edge effects necessary for accurate determination of the extinction and absorption efficiencies. Light beams with polygon-shaped cross sections propagate within a particle and are traced by using a beam-splitting technique. The electric field associated with a beam is calculated using a beam-tracing process in which the amplitude and phase variations over the wavefront of the localized wave associated with the beam are considered analytically. The geometric-optics near field for each ray is obtained, and the single-scattering properties of particles are calculated from electromagnetic integral equations. The present method does not assume additional physical simplifications and approximations, except for geometric optics principles, and may be regarded as a benchmark within the framework of the geometric optics approach. The computational time is on the order of seconds for a single-orientation simulation and is essentially independent of the size parameter. The single-scattering properties of oriented hexagonal ice particles (ice plates and hexagons) are presented. The numerical results are compared with those computed from the discrete-dipole-approximation (DDA) method. (C) 2011 Elsevier Ltd. All rights reserved.
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