Spectral Reflectance Coefficient, Color Characteristics and Relative Transparency of the Black Sea Waters in Spring, 2019 and 2021: Comparative Variability and Empirical Relationships

E. N. Korchemkina✉, E. V. Mankovskaya

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

✉ e-mail: korchemkina@mhi-ras.ru

Abstract

Purpose. The work is purposed at studying spatial variability of the sea reflectance coefficient using the field data, as well as at obtaining empirical relationships between the colorimetric and bio-optical characteristics and comparing them with the already published data.

Methods and Results. The measurement data on spectral reflectance coefficient of the water column and the Secchi disk depth obtained in the expeditions of the R/V Professor Vodyanitsky in the northern and northeastern parts of the Black Sea in April 18 – May 13, 2019 and April 22 – May 8, 2021 were used. Based on the reflectance spectra, the following color characteristics were calculated: dominant wavelength, water color purity, hue angle, and the inherent optical characteristics (absorption of dissolved organic matter and backscattering by suspended particles). Variability of the sea reflectance coefficient and its color characteristics was analyzed for similar periods in spring 2019 and 2021. For the combined data for 2019 and 2021, the relationships between the Secchi disk depth and the reflectance coefficient at maximum, as well as the dominant wavelength were obtained and compared to the known data. For the first time, the empirical relationships connecting the hue angle with the dissolved organic matter absorption and the backscattering by suspended particles were obtained to calculate the inherent optical characteristics of the Black Sea waters.

Conclusions. The distribution of the reflectance coefficient observed in 2019 is more typical of late spring, whereas the similar distribution observed in 2021 rather indicates the continuing winter-spring development of phytoplankton communities that is typical of the deep part of the Black Sea waters in the years with cold winters. Significant correlations between the colorimetric and bio-optical parameters of seawater were established. They can be used as a part of the empirical and semi-analytical algorithms for comprehensive assessing (including application of remote sensing data) the hydrooptical characteristics of the Black Sea waters.

Keywords

spectral reflectance coefficient, Secchi disk depth, dominant wavelength, color purity, hue angle, chromaticity diagram, absorption by dissolved organic matter, particles backscattering, Secchi disk, ocean color

Acknowledgements

The work was carried out within the framework of a state assignment on topics No. FNNN-2024-0016 and No. FNNN-2024-0012, the data were obtained in the 106th and 116th cruises of the R/V Professor Vodyanitsky (Center for Collective Use “R/V Professor Vodyanitsky” of the Federal State Budgetary Scientific Institution of Federal Research Center “A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS”).

Original russian text

Original Russian Text © E. N. Korchemkina, E. V. Mankovskaya, 2024, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 40, Iss. 1, pp. 5–20 (2024)

For citation

Korchemkina, E.N. and Mankovskaya, E.V., 2024. Spectral Reflectance Coefficient, Color Characteristics and Relative Transparency of the Black Sea Waters in Spring, 2019 and 2021: Comparative Variability and Empirical Relationships. Physical Oceanography, 31(1), pp. 3-17.

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