A Monte Carlo ray-tracing model for scattering and polarization by large particles with complex shapes

Details A Monte Carlo ray-tracing model for scattering and polarization by large particles with complex shapes A Monte Carlo ray-tracing model for scattering and polarization by large particles with complex shapes

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10529291g&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue E12, p. 29291-29314

Physics

4

Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Planetology: Solid Surface Planets: Physical Properties Of Materials, Planetology: Solid Surface Planets: Remote Sensing, Planetology: Comets And Small Bodies: Ice

Scientific paper

We present a new model based on Monte Carlo ray tracing which simulates scattering and linear polarization by particles with arbitrary shapes and sizes much larger than the wavelength. The model, called S-Scat, provides a powerful tool for exploring the relationship between actual physical properties of large particles and the single-particle parameters used in multiple-scattering radiative transfer models, and will be particularly valuable for studies of icy outer solar system surfaces. We describe the model algorithm and apply the model to examine absorption and scattering behavior of single, irregular particles as functions of particle size, shape, and optical constants. Single-scattering albedos are investigated first, with results used to test the validity of the widely used equivalent slab model. Single-scattering phase functions are examined next, along with possibilities of parameterization via simple analytic expressions. Finally, the behaviors of linear polarization functions are explored, along with internal path lengths and the spatial distribution of scattered light in close proximity to the particle.

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