Vertical distribution of oxygen and hydrogen sulphide in the Black Sea in 2016
Abstract
The vertical distribution of oxygen and hydrogen sulphide, and the position of suboxic zone boundaries are discussed basing on the results of three 2016 expeditions of the Federal State Budget Scientific Institution «Marine Hydrophysical Institute of RAS» in the central part of the Black Sea (within the economic zone of the Russian Federation). The position of the upper boundary of the suboxic zone (the 10 M isooxigen) was subjected to seasonal and synoptic changes; as a result the depth of suboxic zone in the central part of the sea varied within 0,25–0,30 kg/m3 in sigma-t scale t, which is about 10 m in the depth scale. The position of the 3M isosulphide which separates the suboxic and the hydrogen sulphide zones in the central Black Sea has not changed in the last 50 years and corresponds to the isopycnic surface of t 16,10– 16,15 kg/m3. In deep waters of the Black Sea (below 1750 m) the concentration of hydrogen sulphide gradually increases, which, however, requires confirmation by in-situ measurements over a longer period.
Supporting agencies: The work was carried out under the state task theme No.0827-2018-0003 «Fundamental studies of oceanographic processes that determine the state and evolution of the marine environment under the influence of natural and man-induced factors, using methods of observation and modeling» (Oceanological Processes).
About the Authors
S. I. Kondratev
Federal State Budgetary Institution of Science «Marine Hydrophysical Institute of the Russian Academy of Sciences» (Sevastopol)
Russian Federation
Senior Scientific Researcher, PhD. in Chemistry
Russian Federation
Senior Scientific Researcher, PhD. in Chemistry
A. V. Vidnichuk
Federal State Budgetary Institution of Science «Marine Hydrophysical Institute of the Russian Academy of Sciences» (Sevastopol)
Russian Federation
Senior Engineer, post-graduate student
Russian Federation
Senior Engineer, post-graduate student
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Review
For citations:
Kondratev S.I., Vidnichuk A.V. Vertical distribution of oxygen and hydrogen sulphide in the Black Sea in 2016. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2020;(3):91-99. (In Russ.)
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