Vicarious adjustment of MERIS reflectances using an inverse technique
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).
MCCULLOCH M.;
BARKER K.L.;
ZIBORDI Giuseppe;
2011-03-18
ESA Communications, ESTEC
JRC59545
Additional supporting files
File name | Description | File type | |