POSTER Session 3

HOW REPRESENTATIVE ARE EUROPEAN AERONET-OC SITES OF EUROPEAN MARINE WATERS?

Data from the Ocean Color component of the Aerosol Robotic Network (AERONET-OC) have been extensively used to assess the uncertainty of Ocean Color radiometric products. This study, focusing on operational products from the Sentinel-3 Ocean and Land Colour Instrument (OLCI), aims at investigating where in the European seas the results of match-up analyzes between satellite and AERONET-OC data could be applicable. It relies on a framework of optical clustering and classification under the assumption that uncertainty estimates are similar for similar optical water types. Clustering was applied to OLCI remote sensing reflectance (RRS) data over the European marine sites to define different sets of optical classes and to identify class-based uncertainties through in situ and OLCI match-ups. Fifteen classes were obtained, generally granting medium to high classification levels to most European seas, with the exception of the South and East Mediterranean Sea, Atlantic ocean off the African coast, or the Gulf of Bothnia. Although these results are highly seasonally dependent, in these areas RRS spectra are very often identified as novel, suggesting an underrepresentation of these regions in the AERONET-OC data. Uncertainties were finally mapped onto European seas according to class membership. The largest uncertainty values were obtained in the blue spectral region for almost all classes. From a spatial point of view, whereas the largest values were obtained for clear waters in the blue, moving towards the green and red bands, relatively higher values were observed in coastal areas and in turbid waters.

Ilaria Cazzaniga, Joint Research Centre – European Commission, [email protected], https://orcid.org/0000-0001-8090-3864

Frédéric Mélin, Joint Research Centre – European Commission, [email protected]

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