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TitleOn the Angular Correction of Satellite-based Radiation Data: An Evaluation of the Performance of Erbe Adm in the Arctic
AuthorLi, Z
SourceJournal Theor. Appl. Climat; 54, 1996 p. 235-248
Alt SeriesEarth Sciences Sector, Contribution Series 20041367
AbstractAngular dependence model (ADM) is needed to convert radiance measurements into fluxes. This paper provides an overview on the progress and issues related to the angular correction of radiation data at the top-of-the-atmosphere (TOA), followed by an investigation on the performance of Earth Radiation Budget Experiment (ERBE) ADMs in the Arctic during summer. The variation of inferred albedo with viewing geometry indicates the merit of an ADM. The ERBE ADM for land does well as it leads to near constant albedos for a given solar zenith angle. The ADM for snow/ice is least satisfactory when applied to the Arctic in summer. The performance of the ocean ADM is acceptable except at large solar zenith angles when albedo increases with viewing zenith angle. Significant and systematic variation of albedo with viewing angle and relative azimuth angle are manifest when the overcast ERBE ADM is used for overcast-over-snow/ice scenes. A methodology for correcting ERBE ADMs was developed by renormalizing the anisotropic factor over bins containing sufficient measurements.

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