The Cryosphere Discuss., 5, 271-305, 2011
www.the-cryosphere-discuss.net/5/271/2011/
doi:10.5194/tcd-5-271-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal The Cryosphere (TC). Please refer to the corresponding final paper in TC.
Monitoring spatial and temporal variations of surface albedo on Saint Sorlin Glacier (French Alps) using terrestrial photography
M. Dumont1, P. Sirguey2, Y. Arnaud3, and D. Six1
1Université Joseph Fourier, Laboratoire de Glaciologie et de Géophysique de l'Environnement, UMR 5183, 54 rue Molière, 38402 Saint Martin d'Hères cedex, France
2School of Surveying, University of Otago, P.O. Box 56, Dunedin, New Zealand
3IRD-LTHE, Laboratoire de Glaciologie et de Géophysique de l'Environnement, 54 rue Molière, 38402 Saint Martin d'Hères cedex, France

Abstract. Accurate knowledge of temperate glacier mass balance is essential to understand the relationship between glacier and climate. Defined as the reflected fraction of incident radiation over the whole solar spectrum, the surface broadband albedo is one of the leading variable of their mass balance. This study presents a new method to retrieve the albedo of frozen surfaces from terrestrial photography at visible and near infrared wavelengths. This method accounts for the anisotropic reflectance of snow and ice surfaces and uses a radiative transfer model for narrow-to-broadband conversion. The accuracy of the method was assessed using concomitant measurements of albedo during the summers 2008 and 2009 on Saint Sorlin Glacier (Grandes Rousses, France). These albedo measurements are performed at two locations on the glacier, one in the ablation area and the other in the accumulation zone, with a net radiometer Kipp and Zonen CNR1. Main sources of uncertainty are associated with the presence of high clouds and the georeferencing of the photographs.

Citation: Dumont, M., Sirguey, P., Arnaud, Y., and Six, D.: Monitoring spatial and temporal variations of surface albedo on Saint Sorlin Glacier (French Alps) using terrestrial photography, The Cryosphere Discuss., 5, 271-305, doi:10.5194/tcd-5-271-2011, 2011.
 
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