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Modeling of light scattering in cirrus clouds with inhomogeneous hexagonal monocrystals. Comparison with in‐situ and ADEOS‐POLDER measurements
Author(s) -
C. Labonnote Laurent,
Brogniez Gérard,
DoutriauxBoucher Marie,
Buriez JeanClaude,
Gayet JeanFrançois,
Chepfer Hélène
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl010839
Subject(s) - cirrus , nephelometer , ice crystals , scattering , mie scattering , light scattering , radiative transfer , hexagonal crystal system , distributed ray tracing , optics , cloud physics , atmospheric optics , physics , remote sensing , materials science , ray tracing (physics) , meteorology , geology , cloud computing , chemistry , crystallography , computer science , operating system
An Inhhomogeneous Hexagonal Monocrystal (IHM) model is used to simulate light scattering by randomly oriented hexagonal ice crystals containing air bubbles. This model based on a combination of ray‐tracing, Mie theory and Monte‐Carlo techniques, allows to retrieve the scattering phase function. In‐situ measurements of the light scattering diagram in natural cirrus clouds with an airborne nephelometer have been performed. The results given by the IHM model have been favorably adjusted with these measurements. This agreement provides an opportunity to use this model in order to analyze ADEOS‐POLDER reflectance measurements over cirrus clouds. POLDER uses an original concept to measure, for a given scene, total and polarized reflectances under several viewing directions. A first analysis of cirrus cloud spherical albedoes for the 10th November 1996 shows a rather good agreement between measurements and calculations.