Article Dans Une Revue Quarterly Journal of the Royal Meteorological Society Année : 2005

On the scattering phase-function of non-symmetric ice-crystals

Résumé

Theoretical phase-functions representing randomly oriented fractal ice-crystals, bullet-rosettes, ice aggregates, and an ensemble of ice crystals are compared to measured phase-functions using a Polar Nephelometer located in the Antarctic. The Polar Nephelometer operated at a wavelength of 0.80 µm and measured the scattering phase-functions of individual ice-crystals between the scattering angles of 5.86° and 167°. The Polar Nephelometer was operated in tandem with a Cloud Particle Imager (supplied by SPEC Inc.) both were situated at the South Pole Amundsen–Scott base station during January 2002. In this paper we report on a sample of Polar Nephelometer data obtained over a time interval of 2000 seconds consisting of 3256 phase-functions measured from individual ice-crystals. The 3256 measured phase-functions were averaged to produce an ensemble-averaged phase-function. The theoretical phase-functions have been compared to the measured ensemble-averaged phase-function. The paper demonstrates that phase functions representing single ice-crystal geometries do not reproduce the measured data well. However, the theoretical phase-function representing scattering from an ensemble of ice crystals is found to be the best description of the measured phase-function over all scattering angles.
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Dates et versions

hal-01896436 , version 1 (16-10-2018)

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Anthony J. Baran, Valery Shcherbakov, Brad Baker, Jean-François Gayet, R. Paul Lawson. On the scattering phase-function of non-symmetric ice-crystals. Quarterly Journal of the Royal Meteorological Society, 2005, 131 (611), pp.2609-2616. ⟨10.1256/qj.04.137⟩. ⟨hal-01896436⟩
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