Results of measurements of the spectral light absorption coefficients of all in water optically active components and spectral downwelling irradiance in the Black and Azov Seas, as well as Lake Teletskoye were analysed. The regional specificity of water areas in terms of light absorption by suspended particles and colored dissolved organic matter, water transparency and spectral characteristics of downwelling irradiance has been revealed. Dependences of the euphotic zone and spectral characteristics of light on the total non-water light absorption by particles and colored dissolved organic matter have been revealed and described by power function.
Spectral bio-optical properties of Black Sea coastal waters (near Sevastopol) with different trophic status were analysed. In summer 2020-2021, the chlorophyll a concentration (Ca) differed by an order between stations, located in the apex of the Sevastopol Bay and at a distance ~2 miles from the Sevastopol Bay. At the station located in the apex of the Sevastopol Bay, effected by river runoff (the most trophic waters), the total particulate light absorption at wavelength 438 nm (aP(438)) increased by an order compared to station located at a distance of ~2miles zone from the Bay. The contribution of the light absorption by non-algal particles to the ap(438) was not depended on water trophic status. With a rise of water trophic status the coefficient of colored dissolved organic matter absorption increased by ~2.2 times, and the coefficient of total non-water absorption (atot(438)) increased by ~4 times. The spectral features of downwelling irradiance depended on the atot(438). The increasing of atot(438) of about 10 times resulted in shift of ~50 nm to the longer wavelength domain of the spectrum.
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