Structure of the Field of the Colored Dissolved Organic Matter Concentration in the Kerch Strait

P. D. Lomakin✉, A. I. Chepyzhenko, A. A. Chepyzhenko

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

✉ e-mail: p_lomakin@mail.ru

Abstract

Purpose. Using the data obtained in the expeditions, 2001–2014, the authors intend to identify the typical features of vertical structure of the colored dissolved organic matter (fDOM) concentration field in the Kerch Strait, to type the fDOM(z) profiles, to zone the region under consideration according to a given set of the qualitative features, and also to determine the features of statistical characteristics of the fDOM concentration distribution on the sea surface layer for the water areas with a typical structure.

Methods and Results. The typing was carried out by the method of visual expert assessment of the curves of vertical distribution of concentration of the considered value. It was based on analyzing the fDOM(z) profile shapes. To reveal the boundaries of the areas with typical stratification of the fDOM content field, the thermohaline field structure was analyzed. Three types of water vertical structure were identified; they differed in the fDOM(z) profile shape and in statistical indices of empirical distribution of this substance concentration on the sea surface. These are the Azov Sea and the Black Sea types peculiar to the Azov and Black seas waters not contaminated by dissolved organic matter, and the type, the structure of which identifies the waters containing the anthropogenic component in the concentration field of the analyzed value. The latter type is characterized by a special intrusive shape of the fDOM(z) profile. For each of the identified stratification types, the histograms of the fDOM concentration distribution on the sea surface were calculated.

Conclusions. The fDOM(z) profiles were typed. The Kerch Strait water area was zoned in accordance with a given set of the preliminary revealed qualitative features. The boundaries of the areas with typical stratification and their displacements were determined. It is shown that each structure type has its own statistical distribution of concentration of the considered value on the sea surface.

Keywords

colored dissolved organic matter, stratification types, zoning, haline front, Kerch Strait

Acknowledgements

The work was carried out within the framework of the state task on themes No. 0555-2021-0003 "Development of operational oceanology methods based on interdisciplinary research of processes of the marine environment formation and evolution, and on mathematical modeling using data of remote and contact measurements" and No. 0555-2021-0005 "Complex interdisciplinary studies of oceanologic processes which determine functioning and evolution of ecosystems in the coastal zones of the Black Sea and the Sea of Azov".

Original russian text

Original Russian Text © P. D. Lomakin, A. I. Chepyzhenko, A. A. Chepyzhenko, 2021, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 37, Iss. 5, pp. 565-578 (2021)

For citation

Lomakin, P.D., Chepyzhenko, A.I. and Chepyzhenko, A.A., 2021. Structure of the Field of the Colored Dissolved Organic Matter Concentration in the Kerch Strait. Physical Oceanography, 28(5), pp. 525-537. doi:10.22449/1573-160X-2021-5-525-537

DOI

10.22449/1573-160X-2021-5-525-537

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