Seasonal changes of 234Th scavenging in surface water across the western Black Sea: an implication of the cyclonic circulation patterns

2000 ◽  
Vol 51 (3) ◽  
pp. 335-347 ◽  
Author(s):  
S.B. Gulin
Keyword(s):  
Surface Water ◽  
Black Sea ◽  
Seasonal Changes ◽  
Cyclonic Circulation ◽  
Circulation Patterns

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.

scholarly journals An integrated spatial snap-shot monitoring method for identifying seasonal changes and spatial changes in surface water quality

2016 ◽  
Vol 539 ◽  
pp. 567-576 ◽  
Author(s):  
Vidhya Chittoor Viswanathan ◽  
Yongjun Jiang ◽  
Michael Berg ◽  
Daniel Hunkeler ◽  
Mario Schirmer
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Seasonal Changes ◽  
Surface Water Quality ◽  
Monitoring Method ◽  
Spatial Changes

Possible oceanic circulation patterns, surface water currents and upwelling zones in the Early Palaeozoic

GFF ◽  
2014 ◽  
Vol 136 (1) ◽  
pp. 229-233 ◽  
Author(s):  
Thomas Servais ◽  
Taniel Danelian ◽  
David Alexander Taylor Harper ◽  
Axel Munnecke
Keyword(s):  
Surface Water ◽  
Oceanic Circulation ◽  
Water Currents ◽  
Circulation Patterns ◽  
Early Palaeozoic

scholarly journals Seasonal changes in abundance, lipid and fatty acid composition of Calanus euxinus in the South-eastern Black Sea

2017 ◽  
Vol 64 (3) ◽  
Author(s):  
N. Sen Ozdemir ◽  
A. M. Feyzioglu ◽  
F. Caf ◽  
I. Yildiz
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Black Sea ◽  
Lipid Content ◽  
Seasonal Changes ◽  
Total Lipid Content ◽  
Trophic Levels ◽  
The South ◽  
South Eastern

Seasonal changes in abundance, lipid and fatty acid composition of Calanus euxinus Hulsemann, 1991 were analysed monthly during the period from March 2012 to February 2013. The highest abundance of C. euxinus was recorded in February (847 ind. m-3) during the sampling period. Female and male C. euxinus peaked in February (587 ind. m3, 169 ind. m-3, respectively). However, copepodites peaked in November (107 ind. m-3). Average total lipid content was determined as percentage (%) and per individual (mg ind-1). It was proportionally highest in February (7.03%) and lowest in September (3.02%). However, average lipid content per individual was highest in February (0.11 mg ind-1) and lowest in September and November (0.04 mg ind-1). Major fatty acids in C. euxinus were identified as 16:0, 16:1 n-7, EPA and DHA. ΣSFA, ΣMUFA, ΣPUFA and ΣHUFA were observed to be correlated with temperature. ΣSFA and ΣMUFA increasedwith the rise in temperature (r2=0.74, r2=0.73, p<0.05, respectively) whereas ΣPUFA and ΣHUFA increased as temperature decreased (r2=-0.73, r2=-0.80, respectively, p<0.05). Additionally, while ΣPUFA and ΣHUFA increased (r2=0.61, r2=-0.68, respectively, p<0.05), ΣMUFA decreased (r2=-0.68, p<0.05) as chlorophyll-a increased. It was observed that the degree of unsaturation increased as temperature decreased. Results of the study revealed that C. euxinus has rich lipid content as well as fatty acid composition and it plays an important role in the South-eastern Black Sea ecosystem functionalities especially having key role in energy fluxes to higher trophic levels.

scholarly journals An Evaluation of the Main Physical Features and Circulation Patterns in the Black Sea Basin

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Alina GIRLEANU ◽  
Eugen RUSU
Keyword(s):  
Black Sea ◽  
Warming Trend ◽  
Mitigation Measures ◽  
The Black Sea ◽  
Climate Change Projections ◽  
Black Sea Region ◽  
Circulation Patterns ◽  
General Physical ◽  
Physical Features

Having as target the semi-enclosed basin of the Black Sea, the main purpose of the present paper is to provide an overview of its general physical features and circulation patterns. In order to achieve this goal, more than five decades of data analysis – from  1960 to 2015 – were taken into consideration and the results were checked against known data, both from satellite data over the last two decades and in-situ measurements from earlier decades. The circulation of the Black Sea basin has been studied for almost 400 years, since the Italian Count Luigi Marsigli first described the ‘two layer’ circulation through the Bosphorus Strait in the year 1681. Since climate change projections for the Black Sea region foresee significant impact on the environment in the coming decades, a set of adaptation and mitigation measures is required, therefore more research is needed. Nowadays, the warming trend adds a sense of immediate urgency because according to the National Oceanic and Atmospheric Administration’s National Centre for Environmental Information, July 2020 was the second-hottest month ever recorded for the planet. Its averaged land and ocean surface temperature tied with July 2016 as the second-highest for the month in the 141-year NOAA’s global temperature dataset record, which dates back to 1880. It was 0.92°C above the 20th-century average of 15.8°C, with only 0.01°C less than the record extreme value measured in July of 2019.

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