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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 5
Atmos. Chem. Phys., 10, 2507-2520, 2010
https://doi.org/10.5194/acp-10-2507-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 10, 2507-2520, 2010
https://doi.org/10.5194/acp-10-2507-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  11 Mar 2010

11 Mar 2010

High-accuracy measurements of snow Bidirectional Reflectance Distribution Function at visible and NIR wavelengths – comparison with modelling results

M. Dumont1, O. Brissaud2, G. Picard1, B. Schmitt2, J.-C. Gallet1, and Y. Arnaud3 M. Dumont et al.
  • 1Laboratoire de Glaciologie et de Géophysique de l'Environnement, UMR 5183, 54 rue Molière, 38402 Saint Martin d'Hères cedex, France
  • 2Laboratoire de Planétologie de Grenoble BP 53, 38401 Grenoble Cedex 9, France
  • 3IRD-LTHE, Laboratoire de Glaciologie et de Géophysique de l'Environnement, 54 rue Molière, 38402 Saint Martin d'Hères cedex, France

Abstract. 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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