Abstract. The Mediterranean near-real-time multi-sensor processing chain has
been set up and is operational in the framework of the Copernicus Marine
Environment Monitoring Service (CMEMS). This work describes the main steps
operationally performed to enable single ocean colour sensors to enter the
multi-sensor processing applied to the Mediterranean Sea by the Ocean Colour
Thematic Assembly Centre within CMEMS. Here, the multi-sensor chain takes
care of reducing the inter-sensor bias before data from different sensors are
merged together. A basin-scale in situ bio-optical dataset is used both to
fine tune the algorithms for the retrieval of phytoplankton chlorophyll and
the attenuation coefficient of light, Kd, and to assess the uncertainty
associated with them. The satellite multi-sensor remote sensing reflectance
spectra agree better with the in situ observations than those of the single
sensors. Here, we demonstrate that the operational multi-sensor processing
chain compares sufficiently well with the historical in situ datasets to also
confidently be used for reprocessing the full data time series.
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