Item: Experimental study on the spectral reflectance of snow
Title: Experimental study on the spectral reflectance of snow
Proceedings: Proceedings of the 1998 International Snow Science Workshop, Sunriver, Oregon
Authors: Tsutomu Nakamura, Reina Tamura, Takeshi Ohta and Osamu Abe, Iwate University and Shinjo Branch of Snow and Ice Studies, NIED
Abstract: The spectral reflectance of snow was measured experimentally. Prior to taking the measurements for snow, the spectral reflectance of glass beads of known size distributions was measured for five groups of beads with different diameters: 150-230J, Lm, 500-710J,Lffi, 800-1,200J,Lm, 3mm and 6mm. The results with the glass beads showed no remarkable dependency on incident light angle, but showed a remarkable size dependency; the smaller the grain size the larger the reflectance. Three different types of snow, artificially made new snow, artificial snow that was compacted with age, and natural granular snow, were used for the measurements. The spectral reflectance of the three types of snow showed a less consistent dependency on size than the glass beads, but in general, the smaller the diameter the larger the reflectance. A one-time sequential experiment showed that the spectral reflectance of snow decreased when snow metamorphosed or aged from new snow to granular snow under the influence of intermittent lighting and freezing. This was due to the growth of snow grains, which was revealed by measuring grain size on microscopic photographs taken by the aniline method.
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Keywords: snow reflective properties, snow optics, snow physics, snow, snow cover
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