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contributor authorPinty, Bernard
contributor authorLattanzio, Alessio
contributor authorMartonchik, John V.
contributor authorVerstraete, Michel M.
contributor authorGobron, Nadine
contributor authorTaberner, Malcolm
contributor authorWidlowski, Jean-Luc
contributor authorDickinson, Robert E.
contributor authorGovaerts, Yves
date accessioned2017-06-09T16:52:18Z
date available2017-06-09T16:52:18Z
date copyright2005/07/01
date issued2005
identifier issn0022-4928
identifier otherams-75666.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218027
description abstractNew satellite instruments have been delivering a wealth of information regarding land surface albedo. This basic quantity describes what fraction of solar radiation is reflected from the earth?s surface. However, its concept and measurements have some ambiguity resulting from its dependence on the incidence angles of both the direct and diffuse solar radiation. At any time of day, a surface receives direct radiation in the direction of the sun, and diffuse radiation from the various other directions in which it may have been scattered by air molecules, aerosols, and cloud droplets. This contribution proposes a complete description of the distribution of incident radiation with angles, and the implications in terms of surface albedo are given in a mathematical form, which is suitable for climate models that require evaluating surface albedo many times. The different definitions of observed albedos are explained in terms of the coupling between surface and atmospheric scattering properties. The analytical development in this paper relates the various quantities that are retrieved from orbiting platforms to what is needed by an atmospheric model. It provides a physically simple and practical approach to evaluation of land surface albedo values at any condition of sun illumination irrespective of the current range of surface anisotropic conditions and atmospheric aerosol load. The numerical differences between the various definitions of albedo for a set of typical atmospheric and surface scattering conditions are illustrated through numerical computation.
publisherAmerican Meteorological Society
titleCoupling Diffuse Sky Radiation and Surface Albedo
typeJournal Paper
journal volume62
journal issue7
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/JAS3479.1
journal fristpage2580
journal lastpage2591
treeJournal of the Atmospheric Sciences:;2005:;Volume( 062 ):;issue: 007
contenttypeFulltext


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