Subsatellite experiments in the north-eastern part of the Black Sea

The taxonomic composition and quantitative characteristics of zooplankton in the northeastern part of the Black Sea near the Taman coast in the summer-autumn period of 2018–2019 were studied. Zooplankton was represented mainly by eurythermic and thermophilic forms. All the discovered species and taxa are currently typical of the Black Sea, including the invading species: copepods Acartia tonsa, Oithona davisae, and combtails Mnemiopsis leidyi, Beroe ovata. The average number of zooplankton in 2018 ranged from 2.7–15.9 thousand copies/m3, the biomass – 0.02–0.14 g/m3; its indicators in 2019; they were lower, respectively, 2.0–5.6 thousand copies/m3 and 0.02–0.07 g/m3. These indicators were within the values recorded earlier, in 2013–2014. A significant part of the coastal zooplankton is meroplankton, which accounted for 5–69% of the population and 4–47% its biomass. O. davisae dominated amoung copepods. This speciest was leading in numbers in both years except June 2019. Despite the similarity of the taxonomic composition of zooplankton, the dominant species in terms of biomass differed by month in two years.

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LONG-TERM MONITORING OF SEASONAL AND INTERANNUAL VARIABILITY OF HYDROLOGICAL STRUCTURE IN COASTAL ZONE OF THE NORTH-EASTERN BLACK SEA

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.21610/conferencearticle_58b4317195e3a ◽

2017 ◽

Author(s):

O. Podymov ◽

N. Kuzevanova ◽

A. Khvorosch ◽

...

Keyword(s):

Coastal Zone ◽

Black Sea ◽

Hydrogen Sulphide ◽

Sea Water ◽

The Black Sea ◽

Homogeneous Layer ◽

Marmara Sea ◽

The North ◽

North Eastern ◽

North Eastern Part

The work demonstrates the results of the 6-years complex ship-borne monitoring of coastal zone in the north-eastern part of the Black Sea, carried out by the Southern Branch of P.P.Shirshov Institute of Oceanology, RAS, on a marine cross-section at the Blue Bay (Gelendzhik) beam 1-2 times per month. Climatic changes and eutrophication exert a significant impact on the sea water at the coastal area. In case of the Black Sea these factors pile up with a permanent hydrogen sulphide contamination of the sea water below 80-200 meters depth (depending on the season and distance from the shore). Strong pycno-halocline at the depths from 70 to 160 meters, formed due to the inflow of high salinity water from the Marmara Sea, inhibits the mixing between the water layers and, as a result, also limits the oxygen transport into the deeper layers. The winter cooling reduces the pycno-halocline and enriches the top active layer, down to the cold intermediate layer (CIL), with oxygen and nutrients, which subsequently lead to a vernal phytoplankton bloom. Formation of the thermocline and upper quasi-homogeneous layer (UQL), caused by the water warming in spring, at large extent determines a thickness of phytoplankton-rich layer during the spring and summer seasons. The work demonstrates seasonal and interannual dynamics of the UQL, thermocline, CIL and hydrogen sulphide boundary position in the coastal zone of the north-eastern part of the Black Sea.

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Analysis of the continental slope gravitational deposits (the north-eastern part of the Black Sea)

Moscow University Bulletin. Series 4. Geology ◽

10.33623/0579-9406-2018-6-29-36 ◽

2018 ◽

pp. 29-36

Author(s):

O. A. Khlebnikova ◽

A. A. Ivanova ◽

A. M. Nikishin ◽

A. G. Roslyakov ◽

A. V. Starovoytov

Keyword(s):

Continental Slope ◽

Black Sea ◽

Seismic Data ◽

The Black Sea ◽

Final Phase ◽

The North ◽

Last Glaciation ◽

North Eastern ◽

Gravitational Processes ◽

North Eastern Part

Analysis of new 3D and 2D seismic data made it possible to describe in detail the continental slope relief of the northeastern part of the Black Sea, and a large number of gravitational processes of various types. It is established that the final phase of the active lithodynamic processes development is due to the NovoEvksin regression of the basin associated with the last glaciation and completed its development more than ten thousand years ago. The irregularities formed as a result of late Holocene landslides also occur, but their contribution is insignificant, and the amplitude rarely exceeds 1 m.

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On the large-scale and mesoscale variability of thermohaline characteristics in the north-eastern part of the Black Sea

Soviet Journal of Physical Oceanography ◽

10.1007/bf02196865 ◽

1991 ◽

Vol 2 (2) ◽

pp. 135-144

Author(s):

V. B. Titov

Keyword(s):

Black Sea ◽

Large Scale ◽

The Black Sea ◽

Mesoscale Variability ◽

The North ◽

North Eastern ◽

North Eastern Part

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LONG-TERM MONITORING OF SEASONAL AND INTERANNUAL VARIABILITY OF HYDROLOGICAL STRUCTURE IN COASTAL ZONE OF THE NORTH-EASTERN BLACK SEA

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.31519/conferencearticle_5b1b93b554e1b8.09734764 ◽

2017 ◽

Author(s):

O. Podymov ◽

N. Kuzevanova ◽

A. Khvorosch ◽

...

Keyword(s):

Coastal Zone ◽

Black Sea ◽

Hydrogen Sulphide ◽

Sea Water ◽

The Black Sea ◽

Homogeneous Layer ◽

Marmara Sea ◽

The North ◽

North Eastern ◽

North Eastern Part

The work demonstrates the results of the 6-years complex ship-borne monitoring of coastal zone in the north-eastern part of the Black Sea, carried out by the Southern Branch of P.P.Shirshov Institute of Oceanology, RAS, on a marine cross-section at the Blue Bay (Gelendzhik) beam 1-2 times per month. Climatic changes and eutrophication exert a significant impact on the sea water at the coastal area. In case of the Black Sea these factors pile up with a permanent hydrogen sulphide contamination of the sea water below 80-200 meters depth (depending on the season and distance from the shore). Strong pycno-halocline at the depths from 70 to 160 meters, formed due to the inflow of high salinity water from the Marmara Sea, inhibits the mixing between the water layers and, as a result, also limits the oxygen transport into the deeper layers. The winter cooling reduces the pycno-halocline and enriches the top active layer, down to the cold intermediate layer (CIL), with oxygen and nutrients, which subsequently lead to a vernal phytoplankton bloom. Formation of the thermocline and upper quasi-homogeneous layer (UQL), caused by the water warming in spring, at large extent determines a thickness of phytoplankton-rich layer during the spring and summer seasons. The work demonstrates seasonal and interannual dynamics of the UQL, thermocline, CIL and hydrogen sulphide boundary position in the coastal zone of the north-eastern part of the Black Sea.

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Small river plumes off the north-eastern coast of the Black Sea under average climatic and flooding discharge conditions

10.5194/os-2017-1 ◽

2017 ◽

Author(s):

Alexander Osadchiev ◽

Evgeniya Korshenko

Keyword(s):

Black Sea ◽

Line Source ◽

Climatic Conditions ◽

Small Rivers ◽

The Black Sea ◽

Study Region ◽

The North ◽

North Eastern ◽

North Eastern Part ◽

Heavy Rains

Abstract. This study is focused on the impact of discharge of small rivers on delivery and fate of fluvial water and suspended matter at the north-eastern part of the Black Sea under different local precipitation conditions. Several dozens of mountainous rivers inflow into the sea at the study region and most of them, except the several largest, have small annual runoff and limitedly affect adjacent coastal waters under average climatic conditions. However, discharges of these small rivers are characterized by quick response to precipitation events and can dramatically increase during and shortly after heavy rains which are frequent in the considered area. Delivery and fate of fluvial water and terrigenous sediments at the study region under average climatic and rain-induced flooding conditions were explored and compared using in situ data, satellite imagery and numerical modelling. It was shown that the point-source spread of continental discharge dominated by several large rivers during average climatic conditions can change to the line-source discharge from numerous small rivers situated along the coast in response to heavy rains. Intense line-source runoff of water and suspended sediments forms a geostrophic alongshore current of turbid and freshened water, which induces intense transport of suspended and dissolved constituents discharged with river waters in a north-western direction. This process significantly influences water quality and causes active sediment load at large segments of narrow shelf at the north-eastern part of the Black Sea as compared to average climatic discharge conditions.

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