scholarly journals An algorithm for determining the oxygen concentration in the Black Sea by Argo probes

2021 ◽  
Vol 5 ◽  
pp. 74-81
Author(s):  
Nikolay Nikolov
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Black Sea ◽  
The Black Sea

This paper presents the algorithm for determining the concentration of dissolved oxygen in the Black Sea according to data from Argo probes. A comparison was made between data from two Argo probes released in the Black Sea in 2011 and 2014.

scholarly journals Long-term variability of dissolved oxygen and temperature of the upper layer of the Black sea

2019 ◽  
Vol 59 (1) ◽  
pp. 22-32
Author(s):  
A. B. Polonsky ◽  
A. A. Kotolupova
Keyword(s):  
Seasonal Variation ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Black Sea ◽  
The Black Sea ◽  
Dissolved Oxygen Concentration ◽  
Open Sea ◽  
Technical Systems ◽  
North Western

The article provides an analysis of intra- and inter-annual variability of dissolved oxygen and temperature in the upper layer of the deep-water and north-western parts of the Black Sea in the period from 1923 to 2013. The analysis is carried using the archived data from the oceanographic database of Institute of natural and technical systems. Seasonal variability of dissolved oxygen concentration and temperature is out-of-phase. In average, dissolved oxygen concentration is at a maximum at the N-W shelf in winter and is at a minimum in the open Sea in summer. The amplitude of the seasonal variations is about 50 µmol/l. In general, this is consistent with the published results on the seasonal variation in temperature. However, in some periods, lasting about 20 to 30 years, seasonal variation varies. It is due to quasi-periodical interdecadal variability of dissolved oxygen concentration which differs from one season to another and in various subregions.

scholarly journals Annual and Seasonal Variation in Artemia Population in Relation to Water Quality Parameters in Lake Galgas in Crimea, Russia

2019 ◽  
pp. 1-9
Author(s):  
Rudneva Irina Ivanovna ◽  
Shaida Valentin Grigor’evich ◽  
Sherba Anton Viktorovich ◽  
Zav’vyalov Andrei Veniaminovich
Keyword(s):  
Oxygen Concentration ◽  
Black Sea ◽  
Developmental Stages ◽  
Quality Parameters ◽  
The Black Sea ◽  
Hatching Rate ◽  
Northern Coast ◽  
Hydrochemical Characteristics ◽  
Local Climate ◽  
Artemia Population

Aim: To study seasonal changes of hydrological parameters of the water and Artemia population status in the hypersaline Galgas Lake in the period of 2017-2019. Study Area and Duration: The study was carried out in the Crimea, a peninsula on the northern coast of the Black Sea in Eastern Europe in 2017-2019. Methodology: Water (brine) and Artemia samples were collected monthly from the lake located at the coastal line of the Black Sea. The parameters namely temperature, pH, salinity, Eh, and oxygen concentration of were determined in the water. Artemia population including the developmental stages and the cysts hatching rate of the cysts were measured in different seasons in the study period. The differences in hydrochemical characteristics of the study area in different years and seasons were observed. Results: The results showed that the hydrochemical characteristics of the study area varied with the climate peculiarities. In summer months 2017, the lake was dried out. In the hot period, the temperature of the air and water was above +30°C, the pH ranged insignificantly, and the oxygen concentration was low. Artemia cysts were found throughout the year, however the nauplii were mostly available during spring and autumn seasons, while the adults were found in spring and summer months. Conclusion: The study concluded that the changes of the water parameters depended on season and especially on air temperature. The changes of Artemia population were different in examined years and depended on the water characteristics and especially on temperature and oxygen concentration. The obtained results could be helpful for the local climate changes consequences studies and their influence on aquatic biota.

scholarly journals New Approach for Analyzing Marine Ecosystem Structure Using Bayesian Networks

2021 ◽  
Vol 21 (6) ◽  
pp. 1-8
Author(s):  
Denis Krivoguz ◽  
◽  
Sergey Chernyi ◽  
Artur Manukov ◽  
◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Bayesian Networks ◽  
Black Sea ◽  
Net Primary Production ◽  
Marine Ecosystem ◽  
Water Environment ◽  
Dynamic Bayesian Networks ◽  
The Black Sea ◽  
Ecosystem Structure ◽  
Natural Systems

Aquatic ecosystems of the Black Sea are complex multiparametric systems with a hierarchical structure. Thus, the main goal of our research was to investigate possibilities of using Bayesian networks to study the structure fo the natural systems in the Black Sea. We used CMEMS Black Sea environmental dataset, which consists of 7 different variables, that, in our opinion, can describe structural relations in the Black Sea ecosystem -- sea surface temperature and salinity, concentrations of nitrates and phosphates, amount of chlorophyll-a and net primary production and also dissolved oxygen concentration. We think, that these variables can generally define interactions in water environment of the Black Sea, organisms, that live there and human activity. As a modelling result, we receive a structure of environmental variables interactions. At the top of this structure is a dissolved oxygen, as a final result of the ecosystem functioning. Further, we think it's more appropriate to use Dynamic Bayesian networks for investigation of spatio-temporal changes to distinguish main drivers of changes and provide more balanced management of natural territories.

scholarly journals The Near Bottom Hypoxia and Hydrogen Sulphide Formation on the Black Sea Shelf

2018 ◽  
Keyword(s):  
Dissolved Oxygen ◽  
Black Sea ◽  
Hydrogen Sulphide ◽  
Sea Water ◽  
The Black Sea ◽  
Water Runoff ◽  
Anthropogenic Eutrophication ◽  
Special Investigation ◽  
Modern Period ◽  
Bottom Hypoxia

Purpose. Estimation of the Northwestern part of the Black Sea Shelf in modern period. Methods. The sample of average daily measurements of the temperature, salinity on the surface, level, wind velocity and direction during 2007, 2012 and 2017 had been done. The analyses of the cruise investigation parameters and NASA satellite photos had been done in this region as well. Results. Increasing of nutrient, heavy metals, oil concentration in the Danube, Dnieper and Dniester of water runoff was fixed during the last 50 years. It was the reason of its permanent accumulation in marine ecosystem. Also it was the reason of anthropogenic eutrophication development in the sea water in spring and at the beginning of summer time. Later, at the end of summer and in autumn the dissolved oxygen is decreasing in the bottom layers because of destruction of organic matter. In the last years, decreasing of nutrient from the rivers input was marked. It provided the increasing the transparency in the sea column and made the water condition more positive. But for assessment of the whole ecosystem state the complexes monitoring is absolutely necessary. In September of 2017 the special investigation cruise was done. The result shown the deficit of the dissolved oxygen – hypoxia in the near bottom layer is spreading in the center of the shelf ecosystem (the depths are more than 20 m). The oxygen concentrations were less than 2,0 ml/l.. The reason of this negative phenomena was provided by NASA satellite photos of eutrophication process in summer and marking of upwelling at the shallow waters during the warm period in 2007, 2012 and 2017. Conclusions. Anthropogenic eutrophication development in the sea water was fixed as well as the near bottom hypoxia and hydrogen sulphide formation in the Ukrainian part of the Northwestern shelf of the Black sea in the modern period. Spatial scale of this phenomena is comparable with the scales from 70's of last century.

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