Light absorption by non-algal particles and colored dissolved organic matter at the wavelength of 490 nm in the Black Sea in the autumn (2015 and 2016)

Variability in light absorption by colored dissolved organic matter (α CDOM (λ)),by non-algal particles (α NAP (λ)), and by colored detrital matter (α CDM (λ)) were analyzed in the coastal and deep water regions in the Black sea at the same season (Autumn) to avoid the impact of seasonal variability. The CDOM, NAP and CDM light absorption were parameterized. As result of the parameterization the two parameters were obtained (coefficient et 490 nm and slope coefficient (S):α CDOM (490) and S CDOM ;α NAP (490) and S NAP ; α CDM (490) and S CDM . The CDOM contributed mainly in the α CDM (490) in both coastal (79 ± 13%) and deep water (88 ± 6%) regions. It was observed high (in ~order) variability in the α NAP (490) in coastal waters due to resuspension of sediments from the bottom at shallow stations. The average αS NAP values were 0.010 nm -1 in coastal and 0.012 nm -1 in deep water regions. For all dataset the relationship between of α CDM (490) and S CDM was described by power function. This equation can be used for refining of the regional algorithm of α CDM (λ) assessment in the Black Sea based on satellite data. The obtained in this research relative absorption of NAP and CDOM could be used for remote assessment of α NAP (λ) and α CDOM (λ) in the Black Sea.