Abstract
Based on field observations, the regularities of dissolved matter migration in the mouth areas of rivers of Russia’s Black Sea coast (the Anapka, Ashamba, Mezyb, Hotetsai, Vulan, Kudepsta, and Mzymta rivers) were studied. The conservative behavior (a linear form of the relationship between the component concentration and chloride content) was established for a number of major ions and trace elements: Na, K, Mg, SO4, Li, Rb, Cs, Sr, Co, Ni, Cu, Cd, Sb, Ga, B, F, V, As, Mo, and U. The conditionally nonconservative behavior of calcium and hydrocarbonates also actually corresponds to the conservative behavior, since their excess in the mouths of some rivers is associated with the influx of dispersed groundwater runoff into the mixing zone, in addition to river water. The nonconservative behavior (nonlinear form of the relationship between the component concentration and chloride content, indicating its participation in autochthonous processes in the mixing zone between river and sea water masses) is typical of nutrients involved in production–breakdown (P, Si) and sorption–desorption (P) processes; barium, to a greater or lesser extent is desorbed from river suspended particulate matter (from ∼0 to 390% of its concentration in river water), as well as for Mn, Fe, Pb, Al, Ti, Y, and rare-earth elements, which are removed from the solution during coagulation and flocculation of organic and organomineral colloids (from ∼0 to 85%). The spatiotemporal variability of the distribution of dissolved major and trace elements in the mixing zone between river and sea water masses depends on the variability of the chemical composition of continental runoff and differences in element concentrations at the river and sea boundaries of the mixing zone: an increase in this levels the influence of the first factor. Earlier data revealed the similarity of types of distribution of dissolved major and trace elements in the mouths of large and small rivers of the Russian sectors of the Black and Caspian seas, which differs only in the degree of involvement of elements in certain autochthonous processes at the mouth of each river in a specific period of time.
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The study was financially supported by the Russian Foundation for Basic Research (project no. 20-05-00802).
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Savenko, A.V., Pokrovsky, O.S. Transformation of the Major and Trace Element Composition of Dissolved Matter Runoff in the Mouths of Medium and Small Rivers of Russia’s Black Sea Coast. Oceanology 62, 324–345 (2022). https://doi.org/10.1134/S0001437022030110
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DOI: https://doi.org/10.1134/S0001437022030110