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Proceedings Paper

Radiative transfer model in a cloudy atmosphere: a comparison with airborne cumulus measurement
Author(s): Claire Malherbe; Pierre Simoneau; A. Boischot; Gerard Durand; Joel Deschamps; G. Gregoire
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Paper Abstract

A new model of radiative transfer in a cloudy atmosphere NUALUM has been developed at ONERA. NUALUM uses the Discrete Ordinates Method. This code includes multiple scattering in clouds and takes into account the azimuthal distribution of radiation. NUALUM allows geometry and microphysics of the cloud to be varied (particle size, concentration, top and bottom altitude). The parameterization of a cumulus cloud with NUALUM is compared with airborne measurements performed by ONERA and CELAR: circularvariable filter cryogenic spectrometer SICAP (1.5-5.5 j.tm) and airborne infrared camera CIRAP (3-5 pm and 8-12 tm) aim at the same point of the cloud top. The observation azimuthal angle is variable. SICAP spectral measurements show great variations of the radiation with the azimuthal angle which are in agreement with NUALUM simulations. The correlation between the infrared radiation images CIRAP and mean calculated radiation is satisfactory.

Paper Details

Date Published: 27 December 1995
PDF: 10 pages
Proc. SPIE 2578, Passive Infrared Remote Sensing of Clouds and the Atmosphere III, (27 December 1995); doi: 10.1117/12.228942
Show Author Affiliations
Claire Malherbe, ONERA (France)
Pierre Simoneau, ONERA (France)
A. Boischot, ONERA (France)
Gerard Durand, ONERA (France)
Joel Deschamps, ONERA (France)
G. Gregoire, ONERA (France)


Published in SPIE Proceedings Vol. 2578:
Passive Infrared Remote Sensing of Clouds and the Atmosphere III
David K. Lynch; Eric P. Shettle, Editor(s)

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