POSTER Session 3

RADIATIVE TRANSFER-BASED INVERSION MODEL FOR THE SEA-ATMOSPHERE CONTINUUM

We present a complete and generic solution to the radiative light transfer equations for the coupled atmosphere-shallow water system (4SEA). The 4SEA model employs the four-stream and semi-isotropic scattering approximations and contains the atmospheric layer, the air-water interface, the water column and the bottom layer. 4SEA is generic because it uses the same solution of radiative transfer equations for both media atmosphere and water. It has an inversion scheme and is therefore applied to ocean color data with the skills of deriving a set of atmospheric, oceanic and benthic biophysical variables. The forward model and its inversion were validated against radiative transfer simulations and the Global Reflectance Community Dataset for Imaging and Optical Sensing of Aquatic Environments (GLORIA). The skills of the proposed 4SEA and its inversion scheme were also compared with a well-established shallow-water optical model and showed superior accuracy in derived concentrations of Chlorophyll-a (Chl-a), Suspended Particulate Matter (SPM) and Coloured Dissolved Organic Matter (CDOM). For the simulated ocean color data, the uncertainty (measured as Mean of Absolute Relative Differences) in derived concentrations were 14%, 19%, and 6% for Chl-a, CDOM and SPM respectively. When 4SEA was applied to GLORIA, the uncertainty value, however, increased, in particular in clear water conditions. For Chl-a dominant waters the uncertainty did not exceed 24% for Chl-a but increased for SPM up to 40%. Both applied models, however, showed limitations in deriving the bathymetry and the absorption coefficient at 400 nm of CDOM from the GLORIA data set.

Suhyb Salama, University of Twente, the Netherlands, [email protected], https://orcid.org/0000-0002-6670-6853

Amanda de Liz Arcari, University of Twente, the Netherlands, [email protected]

Juliana Tavora, University of Twente, the Netherlands, [email protected], https://orcid.org/0000-0002-0314-1250

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