Analysis of bio-optical and hydrochemical characteristics was performed on samples taken along the route of the vessel in five seas: the Baltic, North, Norwegian, Barents and White. It has been shown that the values of the absorption coefficient of colored dissolved organic matter, as well as the concentrations of silicates, can be used to assess the developmental stages of phytoplankton. Simultaneous measurements of fluorescence and colored dissolved organic matter absorption coefficient made it possible to see a clear separation of the optical properties of the studied seas.
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