Modelling of the ecosystem of the Black-Sea shelf zone near the estuary of the Danube

This paper is focused on the ichthyoplankton species composition and spatial distribution in the Black sea shelf zone and the deepwater regions off Crimean Peninsula and coast of the Caucasus during the spring hydrological season. Recent changes in the hydrological regime of the Black sea induced by the climate warming have led to an extension of the active and productive spawning of the dominant temperate-water species Sprattus sprattus until the end of the spring hydrological season. An intensive spawning of sprat was detected in March, April and May 2016, 2017 and 2019, which was confirmed by a predominance of younger age group larvae. The maximum number of eggs reached 224 ind./m2 , and the larvae - 116 ind./m2. The wide size range of larvae as well as the low proportion of larvae with empty guts evidenced a favorable fodder base for their survival. The reduction in the age and sizeweight composition of sprat stock in the Black sea observed since 2016 as a result of an increase in its commercial fishing on the shelf of the Crimean Peninsula, did not affect sprat’ spawning activity.

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Dynamics of Riverine Water in the Black Sea Shelf Zone

Processes in GeoMedia—Volume I - Springer Geology ◽

10.1007/978-3-030-38177-6_15 ◽

2020 ◽

pp. 127-135

Author(s):

M. V. Tsyganova ◽

E. M. Lemeshko

Keyword(s):

Black Sea ◽

Shelf Zone ◽

The Black Sea ◽

Riverine Water

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Marine environmental monitoring in the shelf zone of the Black Sea: Assessment of the current state of the pelagic ecosystem

Oceanology ◽

10.1134/s0001437015060016 ◽

2015 ◽

Vol 55 (6) ◽

pp. 871-876 ◽

Cited By ~ 3

Author(s):

E. G. Arashkevich ◽

N. E. Louppova ◽

A. B. Nikishina ◽

L. A. Pautova ◽

V. K. Chasovnikov ◽

...

Keyword(s):

Environmental Monitoring ◽

Black Sea ◽

Shelf Zone ◽

The Black Sea ◽

Pelagic Ecosystem ◽

Current State ◽

Marine Environmental

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Dynamics of chlorophyll a concentration in the Black Sea on satellite data

Marine Biological Journal ◽

10.21072/mbj.2019.04.2.09 ◽

2019 ◽

Vol 4 (2) ◽

pp. 87-95 ◽

Cited By ~ 1

Author(s):

Z. Z. Finenko ◽

I. M. Mansurova ◽

V. V. Suslin

Keyword(s):

Chlorophyll A ◽

Black Sea ◽

Satellite Data ◽

Large Scale ◽

Mixed Layer Depth ◽

Chlorophyll Concentration ◽

Shelf Zone ◽

The Black Sea ◽

Convective Mixing ◽

Stability Of Water

The use of satellite data to study the chlorophyll a dynamics, in contrast to contact methods, allows carrying out large scale research with high frequency of measurements. Such observations were carried out in the Black Sea offshore and inshore areas from 1998 to 2015. They made it possible to estimate the annual and interannual chlorophyll a dynamics in the surface layer and to reveal the periodicity, intensity, and duration of mass development of algae. In the western and eastern cyclonic gyres as well as in the shelf zone off the Crimean and Caucasus coasts, annual chlorophyll dynamics had the same pattern as that repeating year after year. From August-September to April-May of the next year the variation of chlorophyll in most cases corresponded to normal distribution and had a form of a bell-shaped curve with maximum observed in December-January. During autumn period, the chlorophyll concentration gradually increased with water cooling and seasonal pycnoclyne weakening. In winter the chlorophyll concentration decreased due to increase of mixed layer depth. Spring phytoplankton intensive development was observed every year when convective mixing weakened and stability of water column increased.

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Strong Variability of Sound Velocity in the Black Sea Shelf Zone Caused by Inertial Internal Waves

Acoustical Physics ◽

10.1134/s1063771018050093 ◽

2018 ◽

Vol 64 (5) ◽

pp. 580-589 ◽

Cited By ~ 1

Author(s):

A. N. Serebryany ◽

E. E. Khimchenko

Keyword(s):

Sound Velocity ◽

Internal Waves ◽

Black Sea ◽

Shelf Zone ◽

The Black Sea

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The relation of the northwestern shelf deep geological structure of the Black Sea with the phenomenon of gas seeps

Journal of Geology Geography and Geoecology ◽

10.15421/112044 ◽

2020 ◽

Vol 29 (3) ◽

pp. 495-501

Author(s):

Sergii V. Goshovskyi ◽

Oleksii O. Likhosherstov ◽

Olexandr M. Shevchenko ◽

Svitlana G. Slonitska

Keyword(s):

Spatial Distribution ◽

Black Sea ◽

Geological Structure ◽

Earth’S Crust ◽

Effective Parameter ◽

Shelf Zone ◽

The Black Sea ◽

Magnetization Density ◽

Earth's Crust ◽

North Western

Geophysical model inputs were the results of a survey on an anomalous magnetic field and a gravitational field of the Black Sea’s north-western shelf. Thegeophysical profiles of the complex effective parameter (CEP) are calculated and graphed. Complex effective parameter characterizes the relationship between the effective densities and the magnetization by their spatial distribution. Effective parameters (magnetization, density, CEP) were calculated within the studyarea with their distribution on the optimum depth. The profiles are meridional and parallel to each other, direction of the profiles from south to north. The distance between the profiles is 50 kilometers. The generalized deep structure of the study area was elucidated using the graphed profiles. The distribution of CEP on vertical sections within the shelf zone of the western Black Sea basin emphasizes the position in the space of tectonic elements. That is gives an idea about the nature and structure of the region’s lithosphere and their relationship with the spatial distribution of deposits and manifestations of hydrocarbons. Structural and geological interpretation of the CEP profile data was performed. According to the spatial consistency of the correlation by structures, the profiles are conditionally divided into two groups, the western and the eastern. Structural differences in profiles are explained by the presence of the Odesa-Sinop fault zone between the groups. According to the results of profiles interpretation and works of previous researchers, paleogeodynamic processes were established. That significantly complicated the geological structure of the Black Sea’s north-western shelf. The interpretation of the CEP field distribution gives additional arguments in favour of the Earth crust evolution on the north-western shelf of the Black Sea in the conditions of a passive continental margin with short periods of reverse motions with obligatory subduction due to the activation of rifting, the nature of which is yet to be studied. According to the results of interpretation, the presence of the Earth’s crust destruction zone was established. With the help of spatial analysis, the spatial regularities of the gas seeping manifestations with the zone of destruction of the Earth’s crust of continental type and sites of rising of the mantle surface are established.

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