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DOI	10.5194/tc-12-2371-2018
	On the reflectance spectroscopy of snow
	Kokhanovsky A.; Lamare M.; Di Mauro B.; Picard G.; Arnaud L.; Dumont M.; Tuzet F.; Brockmann C.; Box J.E.
发表日期	2018
ISSN	19940416
卷号	12 期号:7
英文摘要	We propose a system of analytical equations to retrieve snow grain size and absorption coefficient of pollutants from snow reflectance or snow albedo measurements in the visible and near-infrared regions of the electromagnetic spectrum, where snow single-scattering albedo is close to 1.0. It is assumed that ice grains and impurities (e.g., dust, black and brown carbon) are externally mixed, and that the snow layer is semi-infinite and vertically and horizontally homogeneous. The influence of close-packing effects on reflected light intensity are assumed to be small and ignored. The system of nonlinear equations is solved analytically under the assumption that impurities have the spectral absorption coefficient, which obey the Ångström power law, and the impurities influence the registered spectra only in the visible and not in the near infrared (and vice versa for ice grains). The theory is validated using spectral reflectance measurements and albedo of clean and polluted snow at various locations (Antarctica Dome C, European Alps). A technique to derive the snow albedo (plane and spherical) from reflectance measurements at a fixed observation geometry is proposed. The technique also enables the simulation of hyperspectral snow reflectance measurements in the broad spectral range from ultraviolet to the near infrared for a given snow surface if the actual measurements are performed at a restricted number of wavelengths (two to four, depending on the type of snow and the measurement system). © Author(s) 2018.
学科领域	absorption coefficient; albedo; grain size; light intensity; reflectance; scattering; snow; spectral reflectance; spectroscopy; Alps; Antarctica; Dome Concordia; East Antarctica; Europe
语种	英语
scopus关键词	absorption coefficient; albedo; grain size; light intensity; reflectance; scattering; snow; spectral reflectance; spectroscopy; Alps; Antarctica; Dome Concordia; East Antarctica; Europe
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119100
作者单位	VITROCISET, Bratustrasse 7, Darmstadt, 64293, Germany; UGA, CNRS, Institut des Géosciences de l'Environnement (IGE), UMR 5001, Grenoble, 38041, France; Meteo-France-CNRS, CNRM UMR 3589, Centre d'Etudes de la Neige, Grenoble, France; Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza, 1, Milan, 20126, Italy; Brockmann Consult, Max Planck Strasse 2, Geesthacht, Germany; Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark
推荐引用方式 GB/T 7714	Kokhanovsky A.,Lamare M.,Di Mauro B.,et al. On the reflectance spectroscopy of snow[J],2018,12(7).
APA	Kokhanovsky A..,Lamare M..,Di Mauro B..,Picard G..,Arnaud L..,...&Box J.E..(2018).On the reflectance spectroscopy of snow.Cryosphere,12(7).
MLA	Kokhanovsky A.,et al."On the reflectance spectroscopy of snow".Cryosphere 12.7(2018).