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  • Author or Editor: D. Tanré x
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B. Pinty
and
D. Tanre

Abstract

The inference of surface reflectance from satellite observations requires the knowledge of the double-way transmittance through the atmosphere. Since the existing pyranometer networks routinely provide measurements of the incident transmittance over sensitive climatic regions, it would be useful for subsequent applications to relate this ground-based measurement to the corresponding double-way transmittance. A variety of satellite radiance simulations corresponding to clear sky conditions has been made in order to derive a suitable parameterized expression between the two quantities. The accuracy of this expression when making use of additional meteorological observations is shown and discussed. Finally, the derived expression is used to improve a method recently proposed by Pinty et al. for retrieving surface albedo over the African Sahel from METEOSAT radiances.

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J. L. Deuze
,
C. Devaux
,
M. Herman
,
R. Santer
, and
D. Tanre

Abstract

In July 1983, the summer transport of Saharian aerosols across the Mediterranean Sea was observed. The dust cloud was particularly dense and was clearly detected in A.V.H.R.R. and METEOSAT imageries. Optical thickness and Angström coeffcients have been derived from these pictures. During the same period, ground based observations—transmission, aureole and polarization measurements—were performed at the Observatoire de Haute Provence (southeast of France). Measured aerosol optical thickness at 550 nm were as large as about 1.5.

The optical thicknesses and Angström coefficients derived from the two experiments are compared and are in good agreement.

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