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| Titel |
High-accuracy measurements of snow Bidirectional Reflectance Distribution Function at visible and NIR wavelengths – comparison with modelling results |
| VerfasserIn |
M. Dumont, O. Brissaud, G. Picard, B. Schmitt, J.-C. Gallet, Y. Arnaud |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 5 ; Nr. 10, no. 5 (2010-03-11), S.2507-2520 |
| Datensatznummer |
250008184
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| Publikation (Nr.) |
 copernicus.org/acp-10-2507-2010.pdf |
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| Zusammenfassung |
| High-accuracy measurements of snow Bidirectional Reflectance Distribution
Function (BRDF) were performed for four natural snow samples with a
spectrogonio-radiometer in the 500–2600 nm wavelength range. These
measurements are one of the first sets of direct snow BRDF values over a wide
range of lighting and viewing geometry. They were compared to BRDF calculated
with two optical models. Variations of the snow anisotropy factor with
lighting geometry, wavelength and snow physical properties were investigated.
Results show that at wavelengths with small penetration depth, scattering
mainly occurs in the very top layers and the anisotropy factor is controlled
by the phase function. In this condition, forward scattering peak or double
scattering peak is observed. In contrast at shorter wavelengths, the
penetration of the radiation is much deeper and the number of scattering
events increases. The anisotropy factor is thus nearly constant and decreases
at grazing observation angles. The whole dataset is available on demand from
the corresponding author. |
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