WebIt has been measured at the snow surface and at the top of the atmosphere, but its dependence on wavelength, snow grain size, and surface roughness is still unknown. … WebNov 5, 2008 · Multispectral visible/near-infrared (VNIR) earth observation satellites, e.g., Ikonos, Quickbird, ALOS AVNIR-2, and DMC, usually acquire imagery in a few (3 – 5) spectral bands. Atmospheric correction is a challenging task for these images because the standard methods require at least one shortwave infrared band (around 1.6 or 2.2 µm) or …
Spectral optical properties of pure ice and snow
WebJan 20, 2024 · An approximate fit to the data reported in Colbeck ( 1982, 1986) yields a value g2 = 4.0 × 10 −2 m 2 s −1 for a liquid volume fraction θ 1 = 0.09. Snow Microstructure Recovered From Reflectance Measurements A new technique was used to recover the optical grain size from reflectance measurements ( Nolin and Dozier, 1992 ). WebJan 1, 2009 · We will give a summary of the theory behind measuring optical snow properties and stress major points of interest. Current methods for quantifying grain size will be presented. ... Warren, S.G ... importance of sleep for preschoolers
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WebOptical properties of antarctic snow S.C. WARREN, T.C. CRENFELL, and P.C. MULLEN Department of Atmospheric Sciences, AK-40 University of Washington Seattle, Washington 98195 ... Warren 1982; Yamanouchi 1983). A preliminary result shows that the albedo ranges between 83 and 86 percent (calibration has not been completed yet)—low under … WebSep 1, 2005 · Just 5–10 mm of continuous snow cover raised the broadband albedo from 0.49 to 0.81, nearly as high as values measured for deep snow on the Antarctic Plateau, α = 0.83 ( Grenfell et al. 1994b ). These results are corroborated by earlier measurements of Weller (1968) on fast ice at Mawson Station. WebIt has been measured at the snow surface and at the top of the atmosphere, but its dependence on wavelength, snow grain size, and surface roughness is still unknown. Thermal infrared emissivity of snow is close to 100% but is a few percent lower at large viewing angles than for overhead viewing. importance of sleep in child development