Dynamics in pigment concentration and light absorption by phytoplankton, non-algal particles and colored dissolved organic matter in the Black Sea coastal waters (near Sevastopol)

T. Efimova; T. Churilova; N. Moiseeva; E. Zemlianskaia; O. Krivenko; E. Sakhon

doi:10.1117/12.2504657

13 December 2018 Dynamics in pigment concentration and light absorption by phytoplankton, non-algal particles and colored dissolved organic matter in the Black Sea coastal waters (near Sevastopol)

T. Efimova, T. Churilova, N. Moiseeva, E. Zemlianskaia, O. Krivenko, E. Sakhon

Author Affiliations +

Proceedings Volume 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 108336C (2018) https://doi.org/10.1117/12.2504657
Event: XXIV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2018, Tomsk, Russian Federation

Abstract

Results of long-term biooptical monitoring and parameterization of light absorption by phytoplankton, non-algal particles ( α_NAP(λ)) and colored dissolved organic matter (α_CDOM(λ)) in coastal surface waters of the Black Sea near Sevastopol have been presented. Seasonal differences in the relationship between phytoplankton light absorption coefficients and chlorophyll a concentrations, which are associated with annual dynamics in the intracellular pigment concentration and composition in the surface layer of the sea, have been revealed. The α_NAP(440) was on ~order increased from off-shore waters to the Sukharnaya Balka, but the α_NAP(440) contribution to the total particulate absorption was the same (~ 20-49% based on IQR) at all stations reflecting the correlated variations in phytoplankton and NAP absorption coefficients at ~440 nm. The obtained slope coefficient (SNAP) values varied from 0.010 to 0.014 nm^-1 . The CDOM light absorption increased significantly (almost in order) from off-shore waters to the Sukharnaya Balka, but the contribution of α_CDOM(440) to total light absorption by particles and dissolved matter changed in the opposite direction: decreased from 40 - 70% to 25 – 45%. The ranges of S_CDOM variability in all investigated areas were close (0.017 to 0.020 nm^-1 based on IQR). The median of S_CDOM was 0.018-0.019 nm^-1 . The obtained in this research results will be used for adaptation of the regional algorithms of remote assessment of water quality and productivity indicators for coastal waters near Sevastopol.

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T. Efimova, T. Churilova, N. Moiseeva, E. Zemlianskaia, O. Krivenko, and E. Sakhon "Dynamics in pigment concentration and light absorption by phytoplankton, non-algal particles and colored dissolved organic matter in the Black Sea coastal waters (near Sevastopol)", Proc. SPIE 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 108336C (13 December 2018); https://doi.org/10.1117/12.2504657

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