Microbial transformation of jellyfish organic matter affects the nitrogen cycle in the marine water column — A Black Sea case study

2016 ◽  
Vol 475 ◽  
pp. 19-30 ◽  
Author(s):  
Tinkara Tinta ◽  
Tjaša Kogovšek ◽  
Valentina Turk ◽  
Tamara A. Shiganova ◽  
Alexander S. Mikaelyan ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Black Sea ◽  
Nitrogen Cycle ◽  
Microbial Transformation ◽  
Marine Water

scholarly journals A BEM for the Hydrodynamic Analysis of Oscillating Water Column Systems in Variable Bathymetry

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3403 ◽  
Author(s):  
Kostas Belibassakis ◽  
Alexandros Magkouris ◽  
Eugen Rusu
Keyword(s):  
Boundary Element Method ◽  
Water Column ◽  
Black Sea ◽  
Bottom Topography ◽  
The Black Sea ◽  
Device Performance ◽  
Oscillating Water Column ◽  
Energy Potential ◽  
Hydrodynamic Analysis

In this work, a novel Boundary Element Method (BEM) is developed and applied to the investigation of the performance of Oscillating Water Column (OWC) systems, taking into account the interaction of the incident wave field with the bottom topography. The modelling includes the effect of additional upwave walls and barriers used to modify the resonance characteristics of the device and improve its performance as the U-OWC configuration. Numerical results illustrating the effects of depth variation in conjunction with other parameters—such as chamber dimensions as well as the parameters associated with the turbine and power take-off system—on the device performance are presented and discussed. Finally, a case study is presented regarding the potential installation of an OWC in a selected port site in the Black Sea, characterized by a good wave energy potential, on the coast of Romania.

Analytical pyrolysis of suspended particulate organic matter from the Black Sea water column

2006 ◽  
Vol 53 (17-19) ◽  
pp. 1856-1874 ◽  
Author(s):  
Yeşim Çoban-Yıldız ◽  
Daniele Fabbri ◽  
Valentina Baravelli ◽  
Ivano Vassura ◽  
Ayşen Yılmaz ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Black Sea ◽  
Particulate Organic Matter ◽  
Sea Water ◽  
The Black Sea ◽  
Analytical Pyrolysis ◽  
Suspended Particulate ◽  
Suspended Particulate Organic Matter

scholarly journals Sulfurization of dissolved organic matter in the anoxic water column of the Black Sea

2021 ◽  
Vol 7 (25) ◽  
pp. eabf6199
Author(s):  
Gonzalo V. Gomez-Saez ◽  
Thorsten Dittmar ◽  
Moritz Holtappels ◽  
Anika M. Pohlabeln ◽  
Anna Lichtschlag ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Matter ◽  
Water Column ◽  
Black Sea ◽  
Large Scale ◽  
Global Climate ◽  
The Black Sea ◽  
Sulfur Species ◽  
Reduced Sulfur

Today’s oceans store as much dissolved organic carbon (DOC) in the water column as there is CO2 in the atmosphere, and as such dissolved organic matter (DOM) is an important component of the global carbon cycle. It was shown that in anoxic marine sediments, reduced sulfur species (e.g., H2S) abiotically react with organic matter, contributing to carbon preservation. It is not known whether such processes also contribute to preserving DOM in ocean waters. Here, we show DOM sulfurization within the sulfidic waters of the Black Sea, by combining elemental, isotopic, and molecular analyses. Dissolved organic sulfur (DOS) is formed largely in the water column and not derived from sediments or allochthonous nonmarine sources. Our findings suggest that during large-scale anoxic events, DOM may accumulate through abiotic reactions with reduced sulfur species, having long-lasting effects on global climate by enhancing organic carbon sequestration.

HEAVY METALS IN WATER, SEDIMENTS AND MARINE FISHES FROM BULGARIAN BLACK SEA

2017 ◽  
Author(s):  
Katya Peycheva ◽  
Katya Peycheva ◽  
Mona Stancheva ◽  
Mona Stancheva ◽  
Stanislava Georgieva ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Black Sea ◽  
Fish Species ◽  
Distribution Patterns ◽  
Marine Fishes ◽  
Marine Water ◽  
Mean Values ◽  
Sprattus Sprattus ◽  
Cu And Zn

In this study, the ecosystem marine water-sediment-biota was investigated and the pollution was assessed. The concentrations of eight elements were determined in marine water, sediments and four fish species collected from Black Sea (Varna), Bulgaria during 2013. Marine water recorded the highest concentrations of Zn (15-22 μg/L), As (1.1–1.2 μg/L) and Pb (0.7-0.8 μg/L) while Zn (31-52 μg/g), Pb (21-29 μg/g) and Cu (20-34 μg/g) and show the highest concentrations in sediments. Water and sediments showed similar spatial distribution patterns for the highest mean values of the different metals. In the analysed fish species, the highest concentration of the metals Cu and Zn were found in Trachurus Mediterrneus (0.42 mg/kg w.w) and in Sprattus Sprattus (12.7 mg/kg w.w), respectively while the heavy metals As and Hg were found with maximum values in Pseta Maxima (3.99 mg/kg w.w and 0.08 mg/kg w.w respectively). The results from this study were compared with our data for a previous period (2004-2006) and they show decrease in the levels of heavy metal.

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