POLREF: A new simulator for polarized reflection coefficient over ocean

Zagolski, F.; Santer, R.; Barker, K.; Huot, J.-P.

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POLREF: A new simulator for polarized reflection coefficient over ocean Zagolski, F.; Santer, R.; Barker, K.; Huot, J.-P. (2013). POLREF: A new simulator for polarized reflection coefficient over ocean, in: Ouwehand, L. (Ed.) Proceedings of the Sentinel-3 OLCI/SLSTR and MERIS/(A)ATSR Workshop, 15–19 October 2012, Frascati, Italy. ESA Special Publications, 711: pp. [1-7]

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Keyword

Marine/Coastal

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Zagolski, F. Santer, R., more Barker, K., more Huot, J.-P.

Abstract

In the validation of the algorithm for the MERIS (MEdium Resolution Imaging Spectrometer) atmospheric corrections over ocean, the water reflectance derived from in-situ measurements represents a key element. The water-leaving radiance needs to be corrected for the sky dome reflection. In the standard protocol, this correction is achieved with an approximate value of the Fresnel reflection coefficient of sea surface applied to the measurement of the sky radiance. This standard correction ignores the polarized nature of both the atmospheric scattering and the Fresnel reflection of the water surface. The introduction of the polarization requires a vector radiative transfer code (RTC) in the coupled «Ocean-Atmosphere» system. The successive orders (SO) of the scattering code offers a good opportunity to analyze the reflected sky dome over ocean when the incident angle corresponds to a significant polarization by reflection. The main objective here is to describe a simulator of the polarized reflection coefficient of sea surface for MERIS. In other words, this simulator is perfectly inline with the MERIS instrument facilities processor (IPF) for the level-2 processing, i.e., using as inputs the same spectral bandset (or nominal wavelenghts), the same set of illumination and viewing geometries, the same set of aerosols (models and aerosol optical properties) and the same boundary conditions.

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