Chlorophyll “a” concentration and light absorption by colored dissolved organic matter in the Black Sea in winter (2018) and summer (2020)
https://doi.org/10.59887/2073-6673.2025.18(1)-5
Abstract
The study was based on the results obtained during the expeditions of the R/V “Professor Vodyanitsky” — from November 24 to December 10, 2018 (PV105), from June 4 to 24, 2020 (PV113). New data of light absorption by colored dissolved organic matter (CDOM in the winter and summer were presented. In winter, in the sea surface layer, the light absorption coefficients of CDOM (aCDOM(438)) (0.10 ± 0.015 m–1), exceeded summer values (0.062 ± 0.025 m–1). There were no seasonal differences in the mean spectral slope (SCDOM) values (0.019 nm–1). However, the variability of SCDOM values in summer is noted in a wider range (0.015 to 0.026 nm–1) than in winter (0.017–0.021 nm–1). The highest SCDOM values are resulted from photodestruction of CDOM in the sea surface layer in summer. An inverse relationship has been revealed between aCDOM(438) and SCDOM, which is described by a power law. Seasonal differences in the content of chlorophyll a (TChl-a) in the upper mixed layer (1.1 ± 0.43 mg m–3 in winter and 0.32 ± 0.11 mg m–3 in summer) and in the type of the TChl-a vertical distribution, due to the water hydrological structure, were shown: in winter — uniform distribution within the upper mixed layer, which was comparable to or exceeded the photosynthesis zone, in summer — the presence of a layer of deep chlorophyll a maximum near the bottom of the euphotic zone. Relationship between aCDOM(438) and SCDOM was not revealed for both seasons.
Keywords
colored dissolved organic matter,
spectral light absorption coefficient,
spectral slope,
chlorophyll a,
the Black Sea
Supporting agencies: The present study was carried out within the framework of state assignment № 124030100106–2 “Study of regional bio-optical properties for development of satellite algorithm for assessment of multi-scale variability of primary production characteristics of pelagic ecosystems”.
About the Authors
T. Ya. Churilova
A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS
Russian Federation
Russian Federation
WoS ResearcherID: O-8437–2016, Scopus AuthorID: 6603622802
2 Nakhimov Ave., Sevastopol 299011
E. Yu. Skorokhod
A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS
Russian Federation
Russian Federation
WoS ResearcherID: A-6831–2019, Scopus AuthorID; 57215009764
2 Nakhimov Ave., Sevastopol 299011
T. V. Efimova
A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS
Russian Federation
Russian Federation
WoS ResearcherID: X-1355–2019, Scopus AuthorID: 57194423783
2 Nakhimov Ave., Sevastopol 299011
N. A. Moiseeva
A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS
Russian Federation
Russian Federation
WoS ResearcherID: AAH-2819–2019, Scopus AuthorID: 57194431032
2 Nakhimov Ave., Sevastopol 299011
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For citations:
Churilova T.Ya., Skorokhod E.Yu., Efimova T.V., Moiseeva N.A. Chlorophyll “a” concentration and light absorption by colored dissolved organic matter in the Black Sea in winter (2018) and summer (2020). Fundamental and Applied Hydrophysics. 2025;18(1):53-65. (In Russ.) https://doi.org/10.59887/2073-6673.2025.18(1)-5
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