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|Title:||Vicarious adjustment of MERIS reflectances using an inverse technique|
|Authors:||MCCULLOCH M.; BARKER K.l.; ZIBORDI Giuseppe|
|Citation:||Proceedings of the ESA Living Planet Symposium - ISBN 978-92-9221-250-6 vol. SP-686|
|Publisher:||ESA Communications, ESTEC|
|JRC Publication N°:||JRC59545|
|Type:||Contributions to Conferences|
|Abstract:||The method used for the vicarious adjustment of the SeaWiFS & MERIS ocean colour data relies on the assumptions that the water-leaving radiance is negligible in the Near Infra-Red (NIR) in oligotrophic waters, and the NIR band is perfectly calibrated. Here, a novel approach to vicarious adjustment is proposed that does not need these assumptions: a least-squares inverse technique is used to adjust the most uncertain parameters in the atmosphere model: the aerosol scattering (¿a) and the ozone optical depth (dToz) within error bars to obtain a best fit between the satellite and buoy water-leaving reflectance. Examples are presented using match-ups of satellite-buoy observations from MERMAID (the MERis Match In-situ Database) for the MOBY & AAOT buoys. The best fit ¿a (and dToz) at 490nm were 0.02 (0.025) for BOUSSOLE (near Nice), 0.02 (0.02) for MOBY (near Hawaii), 0.15 (0.026) for Gustav-Dalen-Tower (Baltic) & 0.06 (0.02) for AAOT (Mediterranean).|
|JRC Institute:||Institute for Environment and Sustainability|
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