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OSOAA: A Vector Radiative Transfer Model of Coupled Atmosphere-Ocean System for a Rough Sea Surface Application to the Estimates of the Directional Variations of the Water Leaving Reflectance to Better Process Multi-angular Satellite Sensors Data Over the OceanIn this study, we present a radiative transfer model, so-called OSOAA, that is able to predict the radiance and degree of polarization within the coupled atmosphere-ocean system in the presence of a rough sea surface. The OSOAA model solves the radiative transfer equation using the successive orders of scattering method. Comparisons with another operational radiative transfer model showed a satisfactory agreement within 0.8%. The OSOAA model has been designed with a graphical user interface to make it user friendly for the community. The radiance and degree of polarization are provided at any level, from the top of atmosphere to the ocean bottom. An application of the OSOAA model is carried out to quantify the directional variations of the water leaving reflectance and degree of polarization for phytoplankton and mineral-like dominated waters. The difference between the water leaving reflectance at a given geometry and that obtained for the nadir direction could reach 40%, thus questioning the Lambertian assumption of the sea surface that is used by inverse satellite algorithms dedicated to multi-angular sensors. It is shown as well that the directional features of the water leaving reflectance are weakly dependent on wind speed. The quantification of the directional variations of the water leaving reflectance obtained in this study should help to correctly exploit the satellite data that will be acquired by the current or forthcoming multi-angular satellite sensors.
Document ID
20150021530
Document Type
Reprint (Version printed in journal)
Authors
Chami, Malik (Paris Univ. France)
LaFrance, Bruno (CS Systèmes d'Information Toulouse Cedex 05, France)
Fougnie, Bertrand (Centre National d'Etudes Spatiales Toulouse, France)
Chowdhary, Jacek (Columbia Univ. New York, NY, United States)
Harmel, Tristan (Paris Univ. France)
Waquet, Fabien (Lille-1 Univ. Villeneuve-d'Asoq, France)
Date Acquired
November 20, 2015
Publication Date
October 14, 2015
Publication Information
Publication: Optics Express
Volume: 23
Issue: 21
Subject Category
Oceanography
Report/Patent Number
GSFC-E-DAA-TN27738
Funding Number(s)
CONTRACT_GRANT: NNX14AB99A
Distribution Limits
Public
Copyright
Other
Keywords
Ocean surface
Water
Radiance
Reflectance
Radiative transfer
Scattering