Show simple item record

contributor authorBa, Mamoudou B.
contributor authorFrouin, Robert
contributor authorNicholson, Sharon E.
contributor authorDedieu, Gérard
date accessioned2017-06-09T15:54:25Z
date available2017-06-09T15:54:25Z
date copyright2001/01/01
date issued2001
identifier issn0894-8755
identifier otherams-5653.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4196767
description abstractDownward surface solar irradiance and albedo of the African continent are estimated from Meteosat B2 data at 30-km spatial resolution. The algorithm, based on Dedieu et al.?s approach, is verified against other satellite estimates and ground-based measurements. In the computations, the International Satellite Cloud Climatology Project?s (ISCCP) radiometric calibration is adjusted using the Libyan desert as a reference target of constant reflectance properties. Surface albedo is corrected for sun zenith angle effects, allowing for better detection of seasonal changes due to the vegetation cycle. The estimates obtained with Meteosat B2 data agree generally well with other satellite estimates, although biases of 20 W m?2 (downward surface solar irradiance) and 0.15 (surface albedo) are obtained in some cases. There is evidence, from comparisons with surface measurements, that the clear-sky downward surface solar irradiance is overestimated over semiarid regions of Africa because of uncertainties in aerosol characteristics. In the Sahel region, where spatial albedo gradients are high, it is advantageous to use 30-km Meteosat B2 products instead of the current, coarser 280-km-resolution ISCCP products.
publisherAmerican Meteorological Society
titleSatellite-Derived Surface Radiation Budget over the African Continent. Part I: Estimation of Downward Solar Irradiance and Albedo
typeJournal Paper
journal volume14
journal issue1
journal titleJournal of Climate
identifier doi10.1175/1520-0442(2001)014<0045:SDSRBO>2.0.CO;2
journal fristpage45
journal lastpage58
treeJournal of Climate:;2001:;volume( 014 ):;issue: 001
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record