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Tishchenko P. Ya. Semkin P. Ju. Tishchenko P. P. Zvalinsky V. I. Barabanshchikov Yu. A. Mikhailik T. A. Sagalaev S. G. Shvetsova M. G. Shkirnikova E. V. Shulkin V. M. 《Doklady Earth Sciences》2017,476(2):1207-1211
The hypoxia of the bottom waters in the Razdolnaya River estuary was observed for the first time in September 2014 during the survey. It is formed as in the seaward part: oxygen is absorbed as a result of destruction of excessive phytoplankton biomass that settles to the bottom and is synthesized on the upper horizon. The high value of primary production in the riverine part of the estuary was caused by the pycnocline formed. Thus, phytoplankton “blooms” above and undergoes destruction beneath the pycnocline. Oxygen is distributed symmetrically in both parts of the estuary with respect to a bar: similar oxygen concentrations, which are maximum on the surface and minimum at the bottom, 300 and <60 μm/L, respectively, are recorded. The anomalies of hydrochemical parameters that have been formed during this process are sharply different in the two parts of the estuary, which most vividly manifests itself in the N/P value and the partial pressure of carbon dioxide pCO2. The causes of this unique situation are discussed.
相似文献3.
P. A. Stunzhas P. Ya. Tishchenko V. V. Ivin Yu. A. Barabanshchikov T. I. Volkova D. I. Vyshkvartsev V. I. Zvalinskii T. A. Mikhailik P. Ju. Semkin P. P. Tishchenko N. D. Khodorenko M. G. Shvetsova F. M. Golovchenko 《Doklady Earth Sciences》2016,467(1):295-298
In August 2013, anoxia of the bottom waters was established in the southern region of the Far East Marine Biosphere Reserve, Far East Branch, Russian Academy of Science, in the depression between Furugelm Island and coastal waters. Death of the benthic community was registered using a remotely operated underwater vehicle. The hydrochemical studies revealed that the area of the absence and/or presence of low oxygen contents corresponds to an area of anomalously high contents of ammonium, phosphates, and silicates, a high partial pressure of carbon dioxide and normalized alkalinity, and the presence of hydrogen sulfide. The microbiological decomposition of diatoms precipitated on the seafloor in the absence of oxygen regeneration was the reason for anoxia. Its formation in summer of 2013 was caused by anomalously abundant precipitates in the Far East. 相似文献
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Semkin P. Yu. Tishchenko P. Ya. Tishchenko P. P. Pavlova G. Yu. Anisimova E. V. Barabanshchikov Yu. A. Mikhailic T. A. Charakin A. N. Shvetsova M. G. 《Water Resources》2022,49(3):429-439
Water Resources - The activity of dissolved radium isotopes 223Ra, 224Ra, 228Ra, the concentrations of nutrients: ammonium, nitrates, nitrites, phosphates, silicates, total nitrogen, and total... 相似文献
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G. Yu. Pavlova P. Ya. Tishchenko N. D. Khodorenko M. G. Shvetsova S. G. Sagalaev 《Russian Journal of Pacific Geology》2012,6(3):251-262
The complex study of the river water and pore solutions from the bottom sediments in the lower reaches of the Razdol’naya River was conducted in February 2010. The major ion composition of the waters indicates the submarine origin of the near-bottom and pore waters in the lower reaches of the Razdol’naya River in the winter. The river estuary extends upstream for more than 20 km. It was established that the studied sediments are reduced oozes containing pyrite, hydrotroilite, and iron monosulfide, which is direct evidence for sulfate-reduction in the sediments. The diagenesis of organic matter is the main reason for the considerable decrease in the amount of sulfates and the increase in the alkalinity of the sediment pore water. The sedimentary pore water sampled from the deep river pits is characterized by excess alkalinity that cannot be explained by sulfate-reduction and methane genesis. It was suggested that the chemical weathering of silicate minerals and the bacterial mineralization of salts of organic acids could result in the excess alkalinity of the sediment pore water. 相似文献
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Tishchenko P. Ya. Khodorenko N. D. Barabanshchikov Yu. A. Volkova T. I. Mar’yash A. A. Mikhailik T. A. Pavlova G. Yu. Sagalaev S. G. Semkin P. Yu. Tishchenko P. P. Shvetsova M. G. Shkirnikova E. M. 《Oceanology》2020,60(3):341-352
Oceanology - In February and July 2014, multidisciplinary geochemical studies of the sediments were carried out at two stations. One of them was located in Voevoda Bight, which has a bottom depth... 相似文献
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T. A. Mikhailik P. Ya. Tishchenko A. M. Koltunov P. P. Tishchenko M. G. Shvetsova 《Water Resources》2011,38(4):512-521
Seasonal variations in biogenic substances (nitrates, nitrites, ammonium, phosphates, and silicates), dissolved oxygen, dissolved
organic matter, chlorophyll, humus, and suspended matter at seven stations on the Razdol’naya River are examined. Based on
seasonal variations, the local sources of river water pollution by biogenic substances were identified. The annual and daily
fluxes of biogenic substances through the Razdol’naya River into Amur Bay are calculated. A diffuse pollution source—agricultural
fields in river valley—are shown to be the main source of biogenic substance fluxes. The vast hypoxia in the bottom water
of Amur Bay, detected by the authors in 2007 and 2008, is supposed to be mostly caused by floods on the Razdol’naya R., which
create favorable conditions of water blooming in Amur Bay in summer. The biomass of dead phytoplankton, experiencing microbiological
decomposition and oxidation, causes hypoxia of bottom waters in the bay. 相似文献