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• W1979507263 abstract "Hemispherical directional reflectance factors (HDRF) were collected under solar zenith angles from 49° to 85°. The experimental site was the Greenland Summit Environmental Observatory (72°35′N, 34°30′W, 3203 m above sea level) where both the snow and the atmosphere are very clean. The observations were carried out for two prevailing snow surface types: a smooth surface with wind‐broken small snow grains and a surface covered with rime causing a higher surface roughness. A specially designed Gonio‐Spectrometer (wavelength range 350–1050 nm), was developed at the Institute for Atmospheric and Climate Science and used to collect spectral HDRFs over the hemisphere. The angular step size was 15° in zenith and azimuth. The HDRFs showed strong variations ranging from 0.6 to 13, depending on the solar zenith angle. The HDRF distribution was nearly isotropic at noon. It varied with increasing solar zenith angle, resulting in a strong forward scattering peak. Smooth surfaces exhibited stronger forward scattering than surfaces covered with rime. At a solar zenith of 85°, an HDRF of ∼13 was observed in the forward scattering direction for λ =900 nm. Spectral albedos were calculated by interpolating the HDRF data sets on a 2° grid and integrating individual wavelengths. Spectral albedos showed variations depending on the solar illumination geometry and the snow surface properties. Broadband albedos were calculated by integration of the spectral albedos over all wavelengths. The broadband albedos derived from directional measurements reproduced the diurnal pattern measured with two back‐to‐back broadband pyranometers." @default.
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• W1979507263 date "2006-10-27" @default.
• W1979507263 modified "2023-10-15" @default.
• W1979507263 title "A field study of the hemispherical directional reflectance factor and spectral albedo of dry snow" @default.
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• W1979507263 doi "https://doi.org/10.1029/2006jd007296" @default.
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