Suspended matter flows in the coastal part of the shelf (according to the results of the expeditionary work 2011–2017, IO RAS) in the Russian sector of the Black Sea

Based on the data of integrated observations, the variability of phytoplankton, the amount of suspended organic matter and zooplankton of the pelagic zone of the Kerch Strait and the pre-strait zone of the Black Sea is considered. The algal flora of the entire Black Sea, the Kerch Strait and the pre-strait is characterized by the predominance of diatoms over pyridineas (pyrrophytes or dinoflagellates). The study of the species range, number and biomass of the phytoplankton community during several periods of the year showed that its dynamics is largely dependent on seasonal weather changes (climate). In the process of phytoplankton development, several phases of autogenic succession were revealed. It is expressed in a sequential change in phytoplankton forms, changes in its abundance and biomass typical of the eastern shelf of the Black Sea. The zooplankton community of the Kerch Strait is represented by micro-, meso- and macro- zooplankton typical of the Black Sea. Microzooplankton is represented by zooflagellates and protozoa, as well as by early larval stages of planktonic crustaceans, apendicularia and mollusks. Its total biomass averages about 80 mg/m3.The above analysis of the collected material allows us to conclude that the distribution of suspended matter and larvae is related primarily to the peculiarities of water circulation in the strait. In the case of low concentrations of larvae, the dynamic factor can be decisive in the process of sedimentation intensity. The amounts of suspended matter can reach 20 mg/m3, which is 2-3 times higher than on average for the Black Sea. It further demonstrates the high productivity of waters and the prospects of the latter to be the area for commercial growing of mussels.

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ROLE OF MOUTH PROCESSES IN THE DYNAMICS OF ACCUMULATIVE FORMS IN COASTAL ZONE OF BLACK SEA (WITHIN THE RUSSIAN SECTOR)

Materials of XXIV International Coastal Conference, devoted to the 60th anniversary of the “Sea Coasts” Working Group of RAS Council SEA COASTS – EVOLUTION, ECOLOGY, ECONOMY ◽

10.31519/conferencearticle_5b5ce3cbeb5b90.32745131 ◽

2018 ◽

Author(s):

М. Исупова ◽

M. Isupova

Keyword(s):

Black Sea ◽

River Mouth ◽

The Black Sea ◽

Special Role ◽

Coastal System ◽

System A ◽

Russian Sector ◽

Mouth Bars ◽

River Mouths

The processes in the river mouth areas play a special role in the formation and dynamics of coastal accumulative forms. The experience of Russian and foreign specialists on investigations of river mouths shows a modern intensification of sea impact on the river deltas in the world and enhance the abrasion of their delta coastlines. These processes show a trend of transformation of different mouths from the fluvial-dominated objects to the marine-dominated objects. A striking example of this process is the variability of the mouth fan, which has a complicated structure, and the mouth bars. In most cases, the structure of the mouth fan presents several successive layers. There are the following 1) abovewater and submarine sand layers; 2) layer of silty sediments of the sea slope of the mouth fan; 3) gently sloping layers of clay, component the foot of the mouth fan; 4) layer of shelf sand, not related to the formation of mouth fan. Each of these layers is characterized by a specific size and composition of sediments. Under intensification of abrasion of the mouth accumulative forms (accordance with the stage of this abrasion), the sediments significantly differed by composition, can be penetrate in the lithodynamic coastal system. A rather complex topography of the underwater slope rugged canyons is typical for the Russian coast of the Black Sea. Through these canyons, sediments, entering the river mouth area and playing an important role in the dynamics of coastal accumulative forms, can be delivered to the depths. These depths exclude of their return.

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MATERIAL AND CHEMICAL COMPOSITION OF SUSPENDED MATTER in the RUSSIAN SECTOR OF THE BLACK SEA SHELF

Materials of XXIV International Coastal Conference, devoted to the 60th anniversary of the “Sea Coasts” Working Group of RAS Council SEA COASTS – EVOLUTION, ECOLOGY, ECONOMY ◽

10.31519/conferencearticle_5b5ce39b2b8944.29139774 ◽

2018 ◽

Author(s):

В. Денисов ◽

V. Denisov ◽

Ю. Ткаченко ◽

Yu. Tkachenko

Keyword(s):

Shallow Water ◽

Black Sea ◽

Suspended Matter ◽

River Flow ◽

High Vacuum ◽

Ferric Hydroxide ◽

The Black Sea ◽

Marine Research ◽

Geochemical Composition ◽

Sedimentary Matter

Using sediment traps (ST) in marine research expeditions from 1986 to 2010, 188 samples of suspended matter were analyzed. All the samples were received from the shallow-water area (2 to 50 meters depth) of the Black sea shelf. Sedimentary matter from the catch basins was singled out by means of direct, high vacuum, membranous ultrafiltration with nuclear filters having 0,45 μm diameter pinholes produced by the United Institute of Nuclear Investigations in Dubna (UINI). The suspended matter received was dried till weight stabilizing, scaled and underwent analytical research. The material composition of the sedimentary matter is represented by the clayed-carbonated-micaceous matter. Biogenous minerals are represented by three carbon types: tiff, aragonite and siderite. The amount of the chiselly biogenous minerals has a subordinate meaning and serves as adulteration in suspended matter. The amount of ore minerals in the suspended matter compositionreaches 2–3 % (ferric oxide – 1 %, ferric hydroxide – up to 2 %, etc.). Geochemical composition of the suspended matter is tightly related to the bioproduction and biofiltration, impact of river flow, shallow-water sediment detachment and inflow of aerosolized matter. The industrial factor plays an important part in formation of modern chemical suspended matter composition.

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Assessment of Applicability of Satellite-Derived Ocean Color Data for Studying Variability of Total Suspended Matter in the Surface Layer of the Deep Part of the Black Sea

Physical Oceanography ◽

10.22449/1573-160x-2020-5-547-556 ◽

2020 ◽

Vol 27 (5) ◽

Author(s):

A. S. Kukushkin ◽

V. V. Suslin ◽

Keyword(s):

Surface Layer ◽

Black Sea ◽

Suspended Matter ◽

Temporal Variability ◽

Ocean Color ◽

Total Suspended Matter ◽

The Black Sea ◽

Backscattering Coefficient ◽

Color Data

Purpose. Studies of spatial-temporal variability of total suspended matter are necessary for understanding the biochemical processes which form and support stable functioning of a marine ecosystem. The aim of the work is to assess applicability of satellite data for studying total suspended matter variability in the surface layer of the deep part of the Black Sea. Methods and Results. Application of the regression analysis yielded the linear regression equations that unite the in situ measurements of the total suspended matter concentrations in the surface layer in the northeastern (June, 2005–2015) and western (November, 2016, 2017 and December, 2017) deep sea areas, and the regional satellite products (the particulate backscattering coefficient, the absorption coefficient of colored detrital matter and the chlorophyll a concentration). Based on the measured and calculated data arrays, the maps of the total suspended matter concentrations in the surface layer of the northeastern Black Sea were constructed. The interannual changes in the in situ measured concentrations of the total suspended and lithogenic matters, as well as in the quasi-synchronous satellite regional products (the light absorption coefficient of colored detrital matter at 490 nm and the particulate backscattering coefficient at 555 nm) in June, 2005–2015 were considered. High total suspended matter concentrations were noted in 2012, just when extreme growth of the coccolithophorid population was observed in the Black Sea. The correlation coefficients were used to evaluate whether the relation between the total suspended matter concentration and the individual analyzed parameters was fast. Conclusions. Spatial distributions of the measured and calculated total suspended matter contents showed satisfactory agreement. In course of the whole observation period, difference between the values of the measured and calculated total suspended matter concentrations was on average 6–23 %. Possibility of application of the satellite-derived ocean color data for studying spatial-temporal variability of the total suspended matter content is shown.

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