17 January 2002 Effective surface albedo due to snow cover of the surrounding area
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Abstract
Albedo inversion techniques are investigated in this work. Several methods are applied to spectral irradiance data from a measurement campaign held in the German Alps during the spring of 1999. One first method is based on the comparison of measurements of absolute levels of UV irradiance with model calculations. The second method takes advantage of changes in the spectral slope of spectral UV irradiance, which is a function of the surface albedo. In the third method, the surrounding area is partitioned into snow- covered and snow-free regions, and the effective albedo estimated by applying a higher or lower reflectivity to each facet before integrating over the surroundings. We present sensitivity analysis, the differences and the correlations between the various methods as well as the results for the different locations.
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Philipp Weihs, Jacqueline Lenoble, Mario Blumthaler, Gunther Seckmeyer, Rolf Philipona, Alain De la Casiniere, Claude Sergent, Timothy Martin, Julian Gruebner, Thierry Cabot, Dominique Masserot, Daniel A. Schmucki, Stana Simic, G. Rengarajan, "Effective surface albedo due to snow cover of the surrounding area", Proc. SPIE 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects, (17 January 2002); doi: 10.1117/12.452913; https://doi.org/10.1117/12.452913
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