Potential for Manganese(II) Oxidation and Manganese(IV) Reduction to Co-Occur in the Suboxic Zone of the Black Sea

1991 ◽  
pp. 173-185 ◽  
Author(s):  
B. M. Tebo ◽  
R. A. Rosson ◽  
K. H. Nealson
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Suboxic Zone

Suboxic zone in the Black Sea: real fact or analytical artefact

2007 ◽  
Vol 3 (4) ◽  
pp. 265-271 ◽  
Author(s):  
Yuri I. Sorokin
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Suboxic Zone

scholarly journals Diversity and Distribution of Planctomycetes and Related Bacteria in the Suboxic Zone of the Black Sea

2006 ◽  
Vol 72 (4) ◽  
pp. 3079-3083 ◽  
Author(s):  
John Kirkpatrick ◽  
Brian Oakley ◽  
Clara Fuchsman ◽  
Sujatha Srinivasan ◽  
James T. Staley ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Black Sea ◽  
Gene Sequence ◽  
The Black Sea ◽  
Anammox Bacteria ◽  
Rrna Gene ◽  
Sequence Information ◽  
Rrna Gene Sequence ◽  
Suboxic Zone

ABSTRACT Samples from six depths of the Black Sea's suboxic zone were analyzed for 16S rRNA gene sequence information. A gradient in phylotype diversity was found. The distributions of known anaerobic ammonium oxidation (anammox) bacteria, many unknown Planctomycetes, and other phylotypes were examined in relation to the local nutrient and redox conditions.

scholarly journals Mixing in the Black Sea detected from the temporal and spatial variability of oxygen and sulfide – Argo float observations and numerical modelling

2014 ◽  
Vol 11 (20) ◽  
pp. 5707-5732 ◽  
Author(s):  
E. V. Stanev ◽  
Y. He ◽  
J. Staneva ◽  
E. Yakushev
Keyword(s):  
Boundary Layer ◽  
Spatial Variability ◽  
Black Sea ◽  
Three Dimensional ◽  
The Black Sea ◽  
Biogeochemical Model ◽  
State Variables ◽  
Temporal And Spatial Variability ◽  
Suboxic Zone ◽  
Temporal And Spatial

Abstract. The temporal and spatial variability of the upper ocean hydrochemistry in the Black Sea is analysed using data originating from profiling floats with oxygen sensors and carried out with a coupled three-dimensional circulation-biogeochemical model including 24 biochemical state variables. Major focus is on the dynamics of suboxic zone which is the interface separating oxygenated and anoxic waters. The scatter of oxygen data seen when plotted in density coordinates is larger than those for temperature, salinity and passive tracers. This scatter is indicative of vigorous biogeochemical reactions in the suboxic zone, which acts as a boundary layer or internal sink for oxygen. This internal sink affects the mixing patterns of oxygen compared to the ones of conservative tracers. Two different regimes of ventilation of pycnocline were clearly identified: a gyre-dominated (cyclonic) regime in winter and a coastal boundary layer (anticyclonic eddy)-dominated regime in summer. These contrasting states are characterized by very different pathways of oxygen intrusions along the isopycnals and vertical oxygen conveyor belt organized in multiple-layered cells formed in each gyre. The contribution of the three-dimensional modelling to the understanding of the Black Sea hydro-chemistry, and in particular the coast-to-open-sea mixing, is also demonstrated. Evidence is given that the formation of oxic waters and of cold intermediate waters, although triggered by the same physical process, each follow a different evolution. The difference in the depths of the temperature minimum and the oxygen maximum indicates that the variability of oxygen is not only just a response to physical forcing and changes in the surface conditions, but undergoes its own evolution.

scholarly journals Vertical Distribution of Phosphates in the Black Sea Based on the Expeditionary Data, 2016–2019

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
S. I. Kondratev ◽  
D. S. Khoruzhii ◽  
◽  
Keyword(s):  
Vertical Distribution ◽  
Black Sea ◽  
Organic Phosphorus ◽  
The Black Sea ◽  
Marine Hydrophysical Institute ◽  
Isopycnic Surface ◽  
Concentration Maximum ◽  
Suboxic Zone ◽  
Upper Mixed Layer ◽  
Upper Boundary

Purpose. The purpose of the study is to analyze the features of vertical distribution of phosphates and dissolved organic phosphorus (Porg) in the Black Sea at the present period. Methods and Results. The data obtained by the scientists of Marine Hydrophysical Institute in the Black Sea within the economic zone of Russia in 2016–2019 were used. At more than 200 deep-sea stations, a cassette of 12 bathometers (the Seabird-Electronics STD-instrument) was applied for taking hydrochemical samples at certain isopycnic surfaces, usually at σt = 16.30; 16.25; 16.20; 16.20; 16.15; 16.10; 16.05; 16.00; 15.95; 15.90; 15.80; 15.50, 14.0 kg/m3. At the coastal shallow-water stations, samples were taken at the 10 m intervals. Such a scheme permitted to carry out vertical sampling in the upper mixed layer and in the suboxic zone (including its upper boundary) with possible minimum of phosphates, to determine the depth of hydrogen sulfide formation and the location of the phosphates concentration maximum in the upper part of the anaerobic zone. Conclusions. From the surface to isopycn σt = 14.4 kg/m3, the content of phosphates and Porg does not exceed 0.1 µM; below this isopycnic surface, the phosphates concentration begins to increase, whereas of Porg remains at the same level. At all the profiles of the phosphates vertical distribution, the phosphates concentration minimum was recorded near the isopycnic surface σt = 15.8 kg/m3, and its maximum – near the isopycnic surface σt = 16.2 kg/m3. The minimum content of phosphates varied within 0–1.5 µM; in 2016–2017 the phosphates concentration maximum did not exceed 8 µM; in 2018, in many cases, it was higher than 12 µM, and once, near the Kerch Strait, it exceeded 17 µM. Increase in the magnitude of the maximum phosphates concentration (in the previous studies in 1988–2013, it did not exceed 8 µM) is assumed to be related to installation of the supports for constructing the Kerch Bridge.

Reply to the Comment by E. R. Sholkovitz on “Redox cycling of rare earth elements in the suboxic zone of the Black Sea”

1992 ◽  
Vol 56 (12) ◽  
pp. 4309-4313 ◽  
Author(s):  
Christopher R. German ◽  
Brenda P. Holliday ◽  
Henry Elderfield
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Black Sea ◽  
Redox Cycling ◽  
The Black Sea ◽  
Suboxic Zone

scholarly journals Effect of large magnetotactic bacteria with polyphosphate inclusions on the phosphate profile of the suboxic zone in the Black Sea

2019 ◽  
Vol 13 (5) ◽  
pp. 1198-1208 ◽  
Author(s):  
Heide N. Schulz-Vogt ◽  
Falk Pollehne ◽  
Klaus Jürgens ◽  
Helge W. Arz ◽  
Sara Beier ◽  
...  
Keyword(s):  
Black Sea ◽  
Magnetotactic Bacteria ◽  
The Black Sea ◽  
Suboxic Zone

scholarly journals Species and δ15N Signatures of Nitrogen Transformations in the Suboxic Zone of the Black Sea

Oceanography ◽  
2005 ◽  
Vol 18 (2) ◽  
pp. 36-47 ◽  
Author(s):  
James Murray ◽  
Clara Fuchsman ◽  
John Kirkpatrick ◽  
Barbara Paul ◽  
Sergey Konovalov
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Nitrogen Transformations ◽  
Suboxic Zone

The Suboxic Zone of the Black Sea

1999 ◽  
pp. 75-91 ◽  
Author(s):  
James W. Murray ◽  
Bing-Sun Lee ◽  
John Bullister ◽  
George W. Luther
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Suboxic Zone
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