Comparison of Bio-Optical Properties of Optically Complex Waters with Different Trophic Status

T. Ya. Churilova1, ✉, T. V. Efimova1, N. A. Moiseeva1, E. Yu. Skorokhod1, D. V. Kalmykova1, I. A. Sutorikhin2, V. V. Kirillov2

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

2 Institute for Water and Environmental Problems of SB of RAS, Barnaul, Russian Federation

✉ e-mail: tanya.churilova@ibss-ras.ru

Abstract

Purpose. Development of regional satellite algorithms requires the information on bio-optical properties of a particular water area. The present study is aimed at comparative analysis of bio-optical properties of optically complex waters differing in their trophic status.

Methods and Results. The study combined the results of measuring the spectral bio-optical properties in the waters of the Black, Azov, Barents and Norwegian seas, the Arctic and Southern oceans (Atlantic sector) and Baikal and Teletskoye lakes. Spectral coefficients of light absorption by phytoplankton, non-algal particles and colored dissolved organic matter were measured in accordance with the International Ocean Colour Coordinating Group Protocols. The study areas included the waters with trophic levels from the oligotrophic to the eutrophic ones (the chlorophyll a concentrations in the surface layers varied from 0.066 to 24 mg·m-3) and with high heterogeneity in their bio-optical properties: the total non-water light absorption at the wavelength of 438 nm varied from 0.021 to 0.97 m-1.

Conclusions. In all the regions, a high (within an order of magnitude or higher) spatial variability in the values of light absorption coefficients by all the optically active components and their ratios was noted. This fact indicates the optical complexity of waters in each of the regions under study. The regional specificity of parameterization coefficients for light absorption by phytoplankton, non-algal particles and colored dissolved organic matter was shown. The revealed parameterization coefficients for light absorption by the optically active environment components can be used to develop regional satellite algorithms for assessing water quality and productivity indicators. Based on the empirically revealed dependencies, the following additional indicators of water quality were proposed: the euphotic zone depth and the spectral characteristics of downwelling irradiance which can be retrieved based on remote sensing data.

Keywords

chlorophyll a, light absorption, phytoplankton, non-algal particles, colored dissolved organic matter, Black Sea, Sea of Azov, Barents Sea, Norwegian Sea, Arctic Ocean, Southern Ocean, Lake Baikal, Lake Teletskoye

Acknowledgements

The study was carried out within the framework of the state assignment theme No. 124030100106-2 “Study of regional features of bio-optical properties of water bodies as a basis for decoding remote sensing data to assess multi-scale variability of primary production characteristics of pelagic ecosystems”. The authors are grateful to the reviewers for their useful recommendations and comments.

Original russian text

Original Russian Text © The Authors, 2024, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 40, Iss. 4, pp. 556–575 (2024)

For citation

Churilova, T.Ya., Efimova, T.V., Moiseeva, N.A., Skorokhod, E.Yu., Kalmykova, D.V., Sutorikhin, I.A. and Kirillov, V.V., 2024. Comparison of Bio-Optical Properties of Optically Complex Waters with Different Trophic Status. Physical Oceanography, 31(4), pp. 507-526.

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