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Reflectance model for satellite monitoring of bio-optical characteristics of Gorky reservoir waters

The first results in development of method for satellite monitoring of the bio-optical water properties of Gorky reservoir as an example of an inland freshwater eutrophic water body are presented. The method is based on the semi-analytical algorithm for the Black Sea and uses the data on the reflectance coefficient of the water column, allowing to calculate the concentrations of optically significant substances (phytoplankton pigments, dissolved organic matter and mineral suspended matter). Field measurements of spectral reflectance were carried out in years 2016 – 2017. Spatial variability of reflectance and factors affecting it were analyzed. Reflectance model used in Black Sea algorithm was adapted to biooptical features of the studied water body. Model calculations of pigment concentration were compared with chlorophyll a content data obtained from water samples analyses. The pigment absorption spectra were calculated, showing the spectral features characteristic of photosynthetic pigments. The ways of further research for algorithm development are determined.