Light Absorption by Main Optically Active Components in Shelf Waters of the Kamchatka Peninsula (August–September 2023). Part 1. Phytoplankton

T. Ya. Churilova1, 2, ✉1, 2, N. A. Moiseeva1, A. S. Buchelnikov1, 3, T. V. Efimova1, 2, P. A. Salyuk4, A. V. Yatsuk5

1 A. O. Kovalevsky Institute of Biology of the Southern Seas of Russian Academy of Sciences, Sevastopol, Russian Federation

2 Far Eastern Federal University, Vladivostok, Russian Federation

3 Sevastopol State University, Sevastopol, Russian Federation

4 V. I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russian Federation

5 Sirius University of Science and Technology, Sirius, Russian Federation

✉ e-mail: tanya.churilova@gmail.com

Abstract

Purpose. The purpose of the study is to analyse the spatial variability of chlorophyll a concentration (TChl-a) and spectral coefficients of light absorption by phytoplankton (aph()), as well as to determine the relationship between aph() and TChl-a in the wavelength range from 400 to 700 nm at 2 nm intervals for different layers of the euphotic zone.

Methods and Results. The research was carried out at 79 stations in August–September 2023. Water samples were collected using Niskin bottles, chlorophyll a concentration was determined spectrophotometrically, and spectral absorption coefficients were measured on moistened glass fiber filters using an integrating sphere. The vertical structure was analysed based on the CTD data, chlorophyll a fluorescence, and photosynthetically available radiation (PAR). The upper mixed layer (UML) and the underlying layers down to the depths with 1 and 0.1% of PAR were identified. The parameterisation was performed using a power function aph() = A(λ) · TChl-aB(λ) for two layers of the euphotic zone and the underlying layer. TChl-a in the surface layer varied within 0.7–14 mg·m⁻³ in the Pacific Ocean and within 0.87–8.9 mg·m⁻³ in the Sea of Okhotsk. Four types were identified. Their formation resulted from water stratification, its location within the euphotic zone and nutrient supply. The coefficients А(438) and А(675) were 0.058 and 0.023 m²·mg⁻¹ for the UML, and 0.043 and 0.020 m²·mg⁻¹ for the layer between UML and the bottom of the euphotic zone. It was shown that at the same light intensity, the chlorophyll a-specific absorption coefficient decreased with increasing TChl-a, which was related to the stronger pigment package effect as the proportion of large-celled species in phytoplankton increased.

Conclusions. For the first time, parameterisation of light absorption by phytoplankton for the study area was performed within the 400–700 nm range (at 2 nm intervals) for two layers in the euphotic zone and for the underlying one. Statistically significant differences between the parameterisation coefficients of these layers were revealed. The obtained relationships can be used to retrieve the aph() spectra from TChl-a, which is necessary for assessing the photosynthetic characteristics of phytoplankton and determining primary production using the spectral method, as well as for developing regional satellite algorithms and operational monitoring of water productivity off the Kamchatka Peninsula.

Keywords

chlorophyll, spectral light absorption coefficient, phytoplankton, shelf waters, Kamchatka

Acknowledgements

During the scientific cruise, water samples were taken within the framework of scientific and educational programme “Floating University” (agreement No. 075-01593-23-06); data processing and primary analysis of the effects of environmental factors on the chlorophyll a concentration were performed within the framework of state assignment of FRC IBSS No. 124030100106-2; vertical profiles of chlorophyll a fluorescence were measured within the framework of state assignment of POI FEB of RAS No. 124022100080-0; and the study of variability of bio-optical properties was funded by the Ministry of Science and Higher Education of the Russian Federation, project No. FZNS-2024-0037.

About the authors

Tatyana Ya. Churilova, Leading Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russian Federation); Leading Researcher, Institute of the World Ocean (School), Far Eastern Federal University (10 Ajax Bay, Russky Island, Vladivostok, 690922, Russian Federation), CSc. (Biol.), SPIN-code: 2238-9533, ORCID ID: 0000-0002-0455-7284, Scopus Author ID: 6603622802, ResearcherID: O-8437-2016, tanya.churilova@ibss-ras.ru

Elena Yu. Skorokhod, Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russian Federation); Junior Researcher, Institute of the World Ocean (School), Far Eastern Federal University (10 Ajax Bay, Russky Island, Vladivostok, 690922, Russian Federation), SPIN-code: 3314-5775, ORCID ID: 0000-0002-3057-3964, Scopus Author ID: 57215009764, ResearcherID: A-6831-2019, elenaskorokhod@ibss-ras.ru

Natalia A. Moiseeva, Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russian Federation) SPIN-code: 8946-3315, ORCID ID: 0000-0003-1356-7981, Scopus Author ID: 57194431032, ResearcherID: AAN-2819-2019, moiseeva@ibss-ras.ru

Anatoly S. Buchelnikov, Leading Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russian Federation); Associate Professor, Sevastopol State University (33 Universitetskaya Str., Sevastopol, 299053, Russian Federation), CSc.(Phys.-Math.), SPIN-code: 4364-8832, ORCID ID: 0000-0002-1853-4671, Scopus Author ID: 38661041800, ResearcherID: B-2280-2013, buchelnikov@ibss-ras.ru

Tatyana V. Efimova, Senior Researcher, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences (2 Nakhimov Ave., Sevastopol, 299011, Russian Federation); Senior Researcher, Institute of the World Ocean (School), Far Eastern Federal University (10 Ajax Bay, Russky Island, Vladivostok, 690922, Russian Federation), SPIN-code: 1668-0742, ORCID ID: 0000-0003-3908-4160, Scopus Author ID: 57194423783, ResearcherID: X-1355-2019, tefimova@ibss-ras.ru

Pavel A. Salyuk, Head of Laboratory, Laboratory of Satellite Oceanology and Laser Sensing, V. I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences (43 Baltiyskaya Str., Vladivostok, 690041, Russian Federation), CSc. (Phys.-Math.), SPIN-code: 1454-3891, ORCID ID: 0000-0002-3224-710X, Scopus Author ID: 9737122900, ResearcherID: E-8592-2014, pavel.salyuk@gmail.com

Andrey V. Yatsuk, Leading Researcher, International Scientific Centre for Ecology and Climate Change, Sirius University of Science and Technology (1 Olympic Ave., Federal Territory “Sirius”, 354340, Russian Federation), Csc. (Geol.), SPIN-code: 5704-5884, ORCID ID: 0000-0003-3975-5438, Scopus Author ID: 55189937800, ResearcherID: I-3720-2017, yatsuk.av@talantiuspeh.ru

Original russian text

Original Russian Text © The Authors, 2026, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 42, Iss. 4, pp. 628–653 (2026)

For citation

Churilova, T.Ya., Skorokhod, E.Yu., Moiseeva, N.A., Buchelnikov, A.S., Efimova, T.V., Salyuk, P.A. and Yatsuk, A.V., 2026. Light Absorption by Main Optically Active Components in Shelf Waters of the Kamchatka Peninsula (August–September 2023). Part 1. Phytoplankton. Physical Oceanography, 33(4), pp. 650–674.

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