scholarly journals Reconciling Trends of Mean Trophic Index and Mean Temperature of the Catch in the Eastern Mediterranean and Black Seas

2018 ◽  
Vol 19 (1) ◽  
pp. 79 ◽  
Author(s):  
ÇETIN KESKIN ◽  
DANIEL PAULY
Keyword(s):  
Black Sea ◽  
Eastern Mediterranean ◽  
The Black Sea ◽  
Trophic Index ◽  
Higher Taxa ◽  
Mean Temperature ◽  
The Mean ◽  
Mean Trophic Level ◽  
Mediterranean And Black Seas ◽  
The Impact

  The mean trophic level, i.e., the Mean Trophic Index (MTI) and Mean Temperature of the Catch (MTC) were estimated for Turkish waters in the Eastern Mediterranean and the Black Sea based on the reconstructed marine fisheries catches (consisting of N = 88 species and/or higher taxa) of in Turkish waters for the year 1950 to 2010. The MTI decreased in both regions of Turkey, following expectations, but the MTC showed different trends in these two regions. It increased (by 0.48 °C·decade-1), along with the SST in the Eastern Mediterranean, while it fluctuated in the Black Sea. This fluctuating behaviour, however, was similar to the fluctuating tendency of SST in the Black Sea. This suggests that the MTI and MTC can be relied upon as indicators of fisheries impacts on ecosystems, and of the impact of changing temperatures on fisheries, respectively. 

scholarly journals Reconstruction of Diffusion Coefficients and Power Exponents from Single Lagrangian Trajectories

Fluids ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 111
Author(s):  
Leonid M. Ivanov ◽  
Collins A. Collins ◽  
Tetyana Margolina
Keyword(s):  
Black Sea ◽  
Diffusion Coefficients ◽  
Current System ◽  
Mean Square Displacement ◽  
California Current ◽  
The Black Sea ◽  
Mean Square ◽  
California Current System ◽  
The Mean ◽  
Non Gaussian

Using discrete wavelets, a novel technique is developed to estimate turbulent diffusion coefficients and power exponents from single Lagrangian particle trajectories. The technique differs from the classical approach (Davis (1991)’s technique) because averaging over a statistical ensemble of the mean square displacement (<X2>) is replaced by averaging along a single Lagrangian trajectory X(t) = {X(t), Y(t)}. Metzler et al. (2014) have demonstrated that for an ergodic (for example, normal diffusion) flow, the mean square displacement is <X2> = limT→∞τX2(T,s), where τX2 (T, s) = 1/(T − s) ∫0T−s(X(t+Δt) − X(t))2 dt, T and s are observational and lag times but for weak non-ergodic (such as super-diffusion and sub-diffusion) flows <X2> = limT→∞≪τX2(T,s)≫, where ≪…≫ is some additional averaging. Numerical calculations for surface drifters in the Black Sea and isobaric RAFOS floats deployed at mid depths in the California Current system demonstrated that the reconstructed diffusion coefficients were smaller than those calculated by Davis (1991)’s technique. This difference is caused by the choice of the Lagrangian mean. The technique proposed here is applied to the analysis of Lagrangian motions in the Black Sea (horizontal diffusion coefficients varied from 105 to 106 cm2/s) and for the sub-diffusion of two RAFOS floats in the California Current system where power exponents varied from 0.65 to 0.72. RAFOS float motions were found to be strongly non-ergodic and non-Gaussian.

scholarly journals Multi-Criteria Analysis of the Mass Tourism Management Model Related to the Impact on the Local Community in Constanta City (Romania)

Inventions ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 46
Author(s):  
Catalin Anton ◽  
Angela-Eliza Micu ◽  
Eugen Rusu
Keyword(s):  
Black Sea ◽  
Seasonal Cycle ◽  
Local Community ◽  
Local Economy ◽  
Management Model ◽  
The Black Sea ◽  
Mass Tourism ◽  
Tourism Management ◽  
The Impact ◽  
The City

Traditionally and socially, the tourism in Constanta is considered to be important to the local economy. Sun and beach locations are both a draw for locals and tourists to the city, on the Black Sea. However, vacation-oriented activities in the city only have a seasonal cycle. In this paper, we proposed to analyze the mass tourist activity in Constanta, taking into account economic, social, and environmental conditions. Additionally, we attempted to build a model based on the data available. The model was developed using a PESTEL analysis to determine the supportability factor of the indicators identified. We also set out to create a projection of the activities proposed for analysis by 2050. To create a model for coastal areas, the data used in this research must be accurate and consistent. Furthermore, correctly identifying indicators and their relationships is a critical step in conducting a thorough study. Last but not least, finding the calculation coefficient for the activity in question is critical, as collecting data from various activities might be challenging when trying to find a feasible model.

Anthropogenic Impact on the Lithodynamics of the Coastal Zone of the Southern and Western Black Sea Coast (Review)

2021 ◽  
Author(s):  
T. V. Efremova ◽  
Yu. N. Goryachkin ◽  
◽  
Keyword(s):  
Coastal Zone ◽  
Black Sea ◽  
Bottom Sediments ◽  
Anthropogenic Impact ◽  
River Flow ◽  
The Black Sea ◽  
Negative Consequences ◽  
Coastal Zones ◽  
Natural Dynamics ◽  
The Impact

Anthropogenic impact on lithodynamics of the coastal zone changes the natural dynamics of bottom sediments, which leads to increased abrasion and swelling of beaches, activation of landslide processes creating a threat of destruction of the coastal infrastructure. The article aims at providing an overview of the scientific literature on the anthropogenic impact on lithodynamics of the coastal zone of the southern and western coasts of the Black Sea (shores of Romania, Bulgaria and Turkey). The work shows that with all the differences in the natural conditions of the coastal zones of these countries the types of anthropogenic effects they undergo are almost the same. These include: hydrotechnical construction without regard to the impact on the neighbouring coast sections; reduction of solid river flow due to river regulation by reservoirs; construction of capital facilities directly on the beaches; illegal extraction of sand from beaches and river beds; dredging with sale of the extracted material to construction companies; covering of cliffs by various structures; destruction of coastal dunes, etc. The main negative consequences of these actions are reflected in disruption of natural dynamics and shortages of bottom sediments, changes in the coastline, reduced aesthetic attractiveness and accessibility of shores, destruction of coastal ecosystems. The article also provides information on the legislation of these countries regarding environmental management in the coastal zone

scholarly journals Hydrology and circulation in the North Aegean (eastern Mediterranean) throughout 1997 and 1998

2002 ◽  
Vol 3 (1) ◽  
pp. 5 ◽  
Author(s):  
V. ZERVAKIS ◽  
D. GEORGOPOULOS
Keyword(s):  
Surface Layer ◽  
Black Sea ◽  
Sea Water ◽  
Saline Water ◽  
Eastern Mediterranean ◽  
Late Summer ◽  
Cyclonic Circulation ◽  
The Black Sea ◽  
The North ◽  
North Aegean

The combination of two research projects offered us the opportunity to perform a comprehensive study of the seasonal evolution of the hydrological structure and the circulation of the North Aegean Sea, at the northern extremes of the eastern Mediterranean. The combination of brackish water inflow from the Dardanelles and the sea-bottom relief dictate the significant differences between the North and South Aegean water columns. The relatively warm and highly saline South Aegean waters enter the North Aegean through the dominant cyclonic circulation of the basin. In the North Aegean, three layers of distinct water masses of very different properties are observed: The 20-50 m thick surface layer is occupied mainly by Black Sea Water, modified on its way through the Bosphorus, the Sea of Marmara and the Dardanelles. Below the surface layer there is warm and highly saline water originating in the South Aegean and the Levantine, extending down to 350-400 m depth. Below this layer, the deeper-than-400 m basins of the North Aegean contain locally formed, very dense water with different θ /S characteristics at each subbasin. The circulation is characterised by a series of permanent, semi-permanent and transient mesoscale features, overlaid on the general slow cyclonic circulation of the Aegean. The mesoscale activity, while not necessarily important in enhancing isopycnal mixing in the region, in combination with the very high stratification of the upper layers, however, increases the residence time of the water of the upper layers in the general area of the North Aegean. As a result, water having out-flowed from the Black Sea in the winter, forms a separate distinct layer in the region in spring (lying between “younger” BSW and the Levantine origin water), and is still traceable in the water column in late summer.

THE ECONOMIC-MILITARY IMPORTANCE OF THE BLACK SEA – NORTH SEA CORRIDOR FOR ENSURING STABILITY IN SOUTHEAST EUROPE

2021 ◽  
Vol 17 (1) ◽  
pp. 141-146
Author(s):  
Valentin-Costinel TOTIR ◽  
Roxana ALEXANDRU
Keyword(s):  
Eastern Europe ◽  
Black Sea ◽  
North Sea ◽  
The Black Sea ◽  
Southeast Europe ◽  
European Continent ◽  
Black Sea Region ◽  
South Eastern ◽  
South Eastern Europe ◽  
The Impact

Abstract: During history, the main channel of communication and cooperation between countries was through commerce and, consequently, through transport. Among all the transport ways, the maritime transport is the one that offers the best cost – benefits ratio. This article is addressed to all the people involved or interested in the economic and military fields and aims to highlight the importance of the Black Sea and North Sea connecting corridor in ensuring peace and stability in Europe in general and in South-Eastern Europe in special. To achieve this goal, we will review the historical conflicts among European countries for waterway control and make a descriptive analysis of the stability situation in the areas affected by them. Furthermore, using the hypothetical-deductive method, we will highlight the manner in which the connection of the Black Sea with the North Sea has influenced economic and military exchanges between riparian states and the impact on stability across European continent. At the end of the article, we will show how economic and military stability in south-eastern Europe is influenced and threatened by geopolitical changes in the wider Black Sea region and how this stability can be maintained and strengthened due to the great possibilities for economic cooperation among the countries of Western and South-Eastern Europe. The novelty of this approach is that it aims to analyze the importance of the Black Sea-North Sea channel in the context of fundamental changes in the politico-military situation in South-East Europe, generated by the expansion of the Russian Federation and the conflict between Turkey and Greece, NATO member countries.

Modern condition of biological diversity in near-shore zone of Crimea (the Black Sea sector)

2003 ◽  
Keyword(s):  
Black Sea ◽  
Biological Diversity ◽  
Parasite Fauna ◽  
Anthropogenic Factors ◽  
The Black Sea ◽  
Quantitative Composition ◽  
Shore Zone ◽  
Near Shore ◽  
The Impact ◽  
Modern Condition

Monograph is prepared on the basis of the materials collected in near-shore waters of Crimea in 2003, and the retrospective data. Modern condition of biological diversity in near-shore zone of Crimea is shown on the basis of analysis of qualitative and quantitative composition of micro- and zooplankton, phyto- and zoobenthos, ichthyofauna and parasite fauna; the recommendations on conservation of biological diversity are given. Responses of biota on the appearance of new species in communities and on the impact of some anthropogenic factors are analyzed. Characteristics of the Black Sea plankton bioluminescents and the bioluminescence field forming by them in neritic zone of Crimea are shown. Lists of species of main groups of flora and fauna from the different regions of near-shore waters of Crimea are made.

Dichin (Bulgaria): Interpreting the Ceramic Evidence in its Wider Context

2007 ◽  
Author(s):  
VIVIEN G. SWAN
Keyword(s):  
Black Sea ◽  
Eastern Mediterranean ◽  
Fifth Century ◽  
Sixth Century ◽  
Cultural Changes ◽  
North Central ◽  
Trading Patterns ◽  
Roman Military ◽  
Eating Practices ◽  
The Impact

In the Dichin (north central Bulgaria) store-buildings destroyed in about the 480s, the large quantities of imported Eastern Mediterranean and Black Sea amphorae typify late Roman military supply (annona) to the forts of the lower Danube limes. A dearth of amphorae at Dichin for most of the sixth century is linked ultimately to alterations in trading patterns in the Mediterranean as a whole. A slight increase in amphorae shortly before the final destruction of c.580 reflects a significant recasting of supply sources. The few imported red-slipped wares are mostly late fifth century and of Pontic origin. During the sixth century, modifications in the local coarse pottery reflect cultural changes in the region — the decline of Romanized eating practices and the impact of the barbarian social traditions. The wider significance of ‘foederati ware’ for the Germanic settlement of the region and its influence on the technology of indigenous ceramics production are also explored.

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