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Spectral albedos of an alpine snowpack
Abstract Spectral albedos (α λ) from 380 to 2500 nm are reported for a snowpack in the Cascade Mountains of Washington. Data were obtained from just after an 0.4 m snowfall on 13 March 1980 until the pack had metamorphosed to melting coarse grains about 1 mm in diameter mixed with dust. Measurements were made under cloudy conditions to obtain a diffuse incident radiation field. Structural parameters of the snow were measured concurrently for all cases, and on three occasions, estimates of absorbing impurity content were obtained. The dependence of the spectral albedos of the snowpack on grain size and impurity content is illustrated. Comparison of wavelength-integrated albedos (α obs) obtained using Kipp and Zonen radiometers with corresponding albedos derived from α λ data show good agreement, and suggests a correlation between α obs and the amount of incident radiation transmitted by the cloud layer. Comparison with theoretical models confirms that impurities in the snow depress α λ at visible wavelengths but have little effect beyond 900 nm in the infrared; however, quantitative agreement with theory is uncertain at present.
Spectral albedos of an alpine snowpack
Abstract Spectral albedos (α λ) from 380 to 2500 nm are reported for a snowpack in the Cascade Mountains of Washington. Data were obtained from just after an 0.4 m snowfall on 13 March 1980 until the pack had metamorphosed to melting coarse grains about 1 mm in diameter mixed with dust. Measurements were made under cloudy conditions to obtain a diffuse incident radiation field. Structural parameters of the snow were measured concurrently for all cases, and on three occasions, estimates of absorbing impurity content were obtained. The dependence of the spectral albedos of the snowpack on grain size and impurity content is illustrated. Comparison of wavelength-integrated albedos (α obs) obtained using Kipp and Zonen radiometers with corresponding albedos derived from α λ data show good agreement, and suggests a correlation between α obs and the amount of incident radiation transmitted by the cloud layer. Comparison with theoretical models confirms that impurities in the snow depress α λ at visible wavelengths but have little effect beyond 900 nm in the infrared; however, quantitative agreement with theory is uncertain at present.
Spectral albedos of an alpine snowpack
Grenfell, Thomas C. (author) / Perovich, Donald K. (author) / Ogren, John A. (author)
Cold Regions, Science and Technology ; 4 ; 121-127
1980-09-22
7 pages
Article (Journal)
Electronic Resource
English
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