Mesoscale circulation and thermohaline structure of the Black Sea observed during HydroBlack '91

Oğuz, Temel; Aubrey, David G.; Latun, V.S.; Demirov, E.; Koveshnikov, L.; Sur, Halil İbrahim; Diaconu, V.; Beşiktepe, Şükrü; Duman, Muhammet; Limeburner, Richard; Еремеев, В. Н.

doi:10.1016/0967-0637(94)90045-0

Cited by 89 publications

(43 citation statements)

References 13 publications

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“…Seawater temperature followed similar patterns, with higher temperature in the eastern basin in the Ionian Sea, whereas the eastern Marmara and Black Seas displayed lower values (Pinet 2006, Oguz et al 1994, as expected from the high freshwater inputs that exceed evaporation in that area (Özsoy & Ünlüata 1997). Nutrient concentrations were generally low and declined toward the eastern basin (Turley 1999, Crispi et al 2001).…”

Section: Discussionmentioning

confidence: 71%

Phyto- and bacterioplankton abundance and viability and their relationship with phosphorus across the Mediterranean Sea

Lasternas¹,

Agustı́²,

Duarte³

2010

Aquat. Microb. Ecol.

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Section: Discussionmentioning

confidence: 71%

Phyto- and bacterioplankton abundance and viability and their relationship with phosphorus across the Mediterranean Sea

Lasternas¹,

Agustı́²,

Duarte³

2010

Aquat. Microb. Ecol.

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“…We present data derived, near-surface, salinity patterns (Fig. 12) obtained under the Co-operative Marine Science Black Sea (CoMSBlack) program (Oguz et al, 1993(Oguz et al, , 1994Ozsoy and Unluata, 1998). These data have been obtained from three quasi-synoptic surveys during 2-29 September 1991, 4-26 July 1992 and 2-14 April 1993.…”

Section: Summary and Discussionmentioning

confidence: 99%

Modelling the impact of atmospheric and terrestrial inputs on the Black Sea coastal dynamics

Kourafalou

Stanev

2001

Ann. Geophys.

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Abstract. The dynamics on the North Western Shelf area of the Black Sea are examined, with an emphasis on the circulation induced by buoyancy due to the land drained fresh waters and by the interaction with the atmosphere, notably wind stress. A three-dimensional, multi-layer hydrodynamic model is employed with realistic topography and parameterisation of river plume physics. We focus on the seasonal patterns of transport of the river induced low-salinity waters within the Coastal Low Salinity Band and the conditions that influence their removal toward the shelf interior.The numerical simulations show that coastal circulation is greatly influenced by river runoff and especially in the case of the Danube, which is excessively high with monthly averaged values ranging from 5000 to 10000 m 3 /s. A significant contribution of runoff comes from the neighboring rivers. At the same time, the NorthWestern Shelf is quite broad, so that the coastal dynamics are largely sheltered from the conditions in the deeper sea. Buoyancy due to river runoff thus dominates, creating a southward coastal current that is the predominant pathway for the land-drained inputs. As in all shelf areas, wind stress is a major circulation forcing mechanism and it modifies the buoyancy induced flow. It is shown that the seasonal variability in river runoff and wind stress, in combination with the shelf topography, determines the different pathways for the terrestrial inputs.Implications on the overall basin circulation are drawn, as the availability of low-salinity waters of river origin affects the upper Black Sea layer. Consequently, the formation of distinct water masses (such as the Cold Intermediate Layer) and the properties of the outflow toward the Mediterranean are also influenced.

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“…Chashchin et al (2015) suggested that factors such as wind direction, sea surface temperature distribution and currents are the most critical factors for Black Sea anchovy migration. The Black Sea circulation is highly variable and dominated by mesoscale eddies, meanders and filaments (Oguz et al, 1994;Oguz and Besiktepe, 1999;Korotaev et al 2003). Incorporating this variability into our modeling approach by using SSH satellite-derived currents covers most of the effect of winds, salinity, eddy formation and frontal features that are of important features of the Black Sea circulation.…”

Section: Satellite Datamentioning

confidence: 99%

“…Velocities calculated as >0.5 cm/s were assigned to 0.5 cm/s in order to reduce erroneous satellite data at the boundaries. However, it should be noted that this process smooths out offshore jets that are known to extend 100 km from the shelf break and reach velocities of about 70 cm/s as cited in Oguz et al, 1994).…”

Section: Satellite Datamentioning

confidence: 99%

Understanding the Impact of Environmental Variability on Anchovy Overwintering Migration in the Black Sea and its Implications for the Fishing Industry

2017

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Black Sea anchovy (Engraulis encrasicolus) undertake extensive overwintering migrations every fall from nursery grounds to warmer overwintering areas located on the south-eastern coast of the Black Sea. During migration and particularly upon arrival at the Anatolian coast, they support an important fishery and valuable source of income for the regional community. Black Sea anchovy have undergone significant stock fluctuations partly related to climatic conditions; for example, migrating anchovy schools arrived late or failed to arrive at the Anatolian coast when fall temperatures increased. It is therefore of importance to understand the conditions required for successful overwintering migration and explore different migration routes. This study invokes a Lagrangian modeling approach applied to satellite derived circulation and temperature data as a first attempt to model anchovy migration dynamics in the Black Sea. This modeling approach takes the influence of the physical environment into account, while the quality of overwintering grounds, adaptive, schooling, and homing behavior is neglected. The model is used to investigate the possible influence of interannual and seasonal variability of temperature and surface currents, as well as the influence of migration behavior on the success of anchovy overwintering migration for both the Black Sea and Azov Sea anchovy. The results of the present work show the possibility that overwintering anchovy fished along the Turkish Eastern Anatolian coast may not exclusively originate from the northwestern shelf, but mainly from the eastern Black Sea basin. Migration pathways are identified for both Black Sea and Azov Sea anchovy, which are of importance for the national fisheries efforts of riparian countries. The modeling results are in agreement with general patterns of anchovy migration given in the literature indicating that the physical environment may be a major factor in shaping general migration patterns. Simulation results are used to hypothesize about alternatives to previously determined migration routes and provide potential reasons that explain the inability of the Bulgarian anchovy fishery to recover. Results show that the intensity and timing of autumnal cooling, coupled with current Guraslan et al.Environmental Impact on Anchovy Overwintering Migration strength, can be of significant importance in determining annual and seasonal variability of migration success. Considering the need for fisheries management to account for the variability in fishable overwintering anchovy stocks a modeling approach as developed in the current study may provide such a tool.

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Mesoscale circulation and thermohaline structure of the Black Sea observed during HydroBlack '91

Cited by 89 publications

References 13 publications

Phyto- and bacterioplankton abundance and viability and their relationship with phosphorus across the Mediterranean Sea

Phyto- and bacterioplankton abundance and viability and their relationship with phosphorus across the Mediterranean Sea

Modelling the impact of atmospheric and terrestrial inputs on the Black Sea coastal dynamics

Understanding the Impact of Environmental Variability on Anchovy Overwintering Migration in the Black Sea and its Implications for the Fishing Industry

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