On the Possible Presence of Oxygen in the Upper Sediment Layer of the Hydrogen Sulfide Zone in the Black Sea
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The possible penetration of O2 into the upper layers of the H2S zone in the contact area between the peripheral boundaries of the chemocline and bottom slope was studied in the northeastern Black Sea in June and July 2015 and 2017. The study was carried out in two directions: (1) the search for living eukaryotic organisms (micro- and meiobenthos) in hypoxic and anoxic conditions; (2) measurement of O2 in the bottom water layer and in the upper layer of sediments. Both directions were combined during measurements.
Benthic surveys were conducted off Gelendzhik Bay, in the hydrophysical survey area of the Shirshov Institute of Oceanology, Russian Academy of Sciences (IO RAS), and near a moored buoy station equipped with an Akvalog scanning profiling system  aboard the BMP-74 fishing vessel Ashamba. A Rumolot sediment corer, designed by the Kovalevsky Institute of Marine Biological Research (IMBR), was used. The corer consists of a transparent acrylic tube with a wall thickness of 3...
The work was financially supported by the Russian Foundation for Basic Research, project no. 17-05-00381.
The work was prepared in accordance with the State Assignment of the Kovalevsky Institute of Marine Biological Research (topic “Functional Metabolic and Toxicological Aspects of the Existence of Hydrobionts and Their Populations in Biotopes with Different Phyiscochemical Regimes”, state registration no. АААА-А18-118021490093-4).
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