Measurements and computations of polarized marine reflectance

Bertrand Fougnie; Robert J. Frouin; Pierre-Yves Deschamps; Malik Chami; Antoine Poteau; Olivier Hagolle

doi:10.1117/12.406626

15 November 2000 Measurements and computations of polarized marine reflectance

Bertrand Fougnie, Robert J. Frouin, Pierre-Yves Deschamps, Malik Chami, Antoine Poteau, Olivier Hagolle

Proceedings Volume 4133, Polarization Analysis, Measurement, and Remote Sensing III; (2000) https://doi.org/10.1117/12.406626
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

In this study, we try to improve the understanding of the polarization of the signal reflected by the water body for which an accurate knowledge is necessary in remote-sensing applications. We only detail the Opol factor defined as the ratio between the vertically polarized to the total (unpolarized) marine reflectance. In the validation plans of many ocean color sensors, some above-water measurements of the diffuse marine reflectance, such as the SIMBAD measurements, use polarized observation of the sea which reduce the skylight reflection effects. Consequently, to access the marine reflectance, a correction by the Opol factor is made and for which an accuracy better than 2% is required. Another goal is to better consider polarization in the computation of the Top of the Atmosphere signal in the absolute calibration of satellite sensors over Rayleigh scattering (POLDER for instance). Measurements were collected for various conditions by REFPOL and SIMBAD radiometers. The results were confronted to computations performed using two different transfer radiative codes, a Monte-Carlo code and a Successive Order of Scattering code. The radiative transfer into the sea is computed considering the water index, the concentration and polarized phase function for the phytoplankton. As the upwelling signal observed just above the sea surface depends strongly to the radiance downwelling onto the sea surface, the presence of molecules and aerosol in the atmosphere which induce a polarized signature, have to be considered.

Citation Download Citation

Bertrand Fougnie, Robert J. Frouin, Pierre-Yves Deschamps, Malik Chami, Antoine Poteau, and Olivier Hagolle "Measurements and computations of polarized marine reflectance", Proc. SPIE 4133, Polarization Analysis, Measurement, and Remote Sensing III, (15 November 2000); https://doi.org/10.1117/12.406626

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