Optimization of the mixing ratio of ice crystal shapes in cirrus clouds for atmospheric point spread function modeling

Isabelle Muguet; Patrick Chervet; Claude Rozé

doi:10.1117/12.737039

29 October 2007 Optimization of the mixing ratio of ice crystal shapes in cirrus clouds for atmospheric point spread function modeling

Isabelle Muguet, Patrick Chervet, Claude Rozé

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Proceedings Volume 6747, Optics in Atmospheric Propagation and Adaptive Systems X; 67470E (2007) https://doi.org/10.1117/12.737039
Event: SPIE Remote Sensing, 2007, Florence, Italy

Abstract

A critical issue to calculate the image transmission through cirrus clouds is to obtain a detailed description of the angular distribution of the scattered radiation in the forward direction. Computation of the scattering phase function on the basis of microphysics description of the cloud thanks to ray-tracing codes, seems to be the best way to fulfill this requirement. However, a comprehensive microphysical model can not be found, because of the great variability of the ice crystals composing natural cirrus. An optimization process has been developed to find the best mixing ratio of four pristine ice crystals shapes that minimizes the error on the forward peak of the scattering phase function. To achieve this goal, a comparison with a reference phase function derived from MODIS database has been led. The bulk scattering properties of the seven size distributions defined in this database have been computed at four wavelengths in the spectral domain from visible to medium infrared, applying the mixing ratio obtained after an optimization at 0.55μm. Used as an input to a propagation model based on a Monte Carlo method, PSF have been computed. They show very good agreement with the PSF calculated with the corresponding reference scattering properties.

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Isabelle Muguet, Patrick Chervet, and Claude Rozé "Optimization of the mixing ratio of ice crystal shapes in cirrus clouds for atmospheric point spread function modeling", Proc. SPIE 6747, Optics in Atmospheric Propagation and Adaptive Systems X, 67470E (29 October 2007); https://doi.org/10.1117/12.737039

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KEYWORDS

Scattering

Clouds

Crystals

Point spread functions

MODIS

Databases

Atmospheric modeling

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