Email this article Diagenesis of Organic Matter in the Top Layer of the Sediments of the Peter the Great Bay in Hypoxia Locations
- Authors: Tishchenko P.Y.1, Barabanshchikov Y.A.1, Volkova T.I.1, Marjash A.A.1, Mikhailik T.A.1, Pavlova G.Y.1, Sagalaev S.G.1, Tishchenko P.P.1, Khodorenko N.D.1, Shkirnikova E.M.1, Shvetsova M.G.1
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Affiliations:
- Il’ichev Pacific Oceanological Institute, Far East Branch
- Issue: Vol 56, No 2 (2018)
- Pages: 171-181
- Section: Article
- URL: https://journals.rcsi.science/0016-7029/article/view/155864
- DOI: https://doi.org/10.1134/S0016702918010093
- ID: 155864
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Abstract
During Cruise 62nd of the R/V “Professor Gagarinsky” in September, 2014, the carbonate system of sediments and contents of nutrients and organic carbon in pore water were studied in two geochemical stations located in hypoxia areas in the Peter the Great Bay. It was established that the concentrations of silica, phosphorus, and ammonium increase by 5, 10, and 20 times, respectively, with sediment depth to 70–80 cm. The alkalinity, dissolved inorganic carbon, and the partial pressure of carbon dioxide significantly increase with depth, while рН value and organic matter (ОM) decrease. Changes in the chemical composition of pore water with sediment depth (0–80 cm) are caused by anaerobic microbial degradation of OM, concentration of which in the top sediment layer is 2–3%. The degradation products of OM in the bottom waters of bay and pore waters of bottom sediments indicate that its main sources are diatoms. During hypoxia, the oxygen demand rate by sediment surface near Furugelm Island is estimated to be 5 mmol/(m2 day). A combination of such factors as downwelling circulation, the absence of photosynthetically active radiation, and the high oxygen demand rate at the water/sediment interface provides hypoxia formation in the depressions of the Peter the Great Bay bottom topography.
About the authors
P. Ya. Tishchenko
Il’ichev Pacific Oceanological Institute, Far East Branch
Author for correspondence.
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
Yu. A. Barabanshchikov
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
T. I. Volkova
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
A. A. Marjash
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
T. A. Mikhailik
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
G. Yu. Pavlova
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
S. G. Sagalaev
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
P. P. Tishchenko
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
N. D. Khodorenko
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
E. M. Shkirnikova
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
M. G. Shvetsova
Il’ichev Pacific Oceanological Institute, Far East Branch
Email: tpavel@poi.dvo.ru
Russian Federation, ul. Baltiiskaya 43, Vladivostok, 690041
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