Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasons
Hydrological and chemical surveys were conducted in the Uglovoy Bight in October, 2019, February, May and June, 2020 (in total 120 stations) and chemical analyses of water from 13 small rivers running into the bight were done on October 21-22, 2020. Extremely high concentration of nutrients was dete...
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| Language: | Russian |
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2021-03-01
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| Series: | Известия ТИНРО |
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| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/617 |
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| author | P. Ya. Tishchenko Yu. A. Barabanshchikov G. Yu. Pavlova A. A. Ryumina S. G. Sagalaev P. Yu. Semkin P. P. Tishchenko O. A. Ulanova M. G. Shvetsova E. M. Shkirnikova E. Yu. Tibenko |
| author_facet | P. Ya. Tishchenko Yu. A. Barabanshchikov G. Yu. Pavlova A. A. Ryumina S. G. Sagalaev P. Yu. Semkin P. P. Tishchenko O. A. Ulanova M. G. Shvetsova E. M. Shkirnikova E. Yu. Tibenko |
| author_sort | P. Ya. Tishchenko |
| collection | DOAJ |
| description | Hydrological and chemical surveys were conducted in the Uglovoy Bight in October, 2019, February, May and June, 2020 (in total 120 stations) and chemical analyses of water from 13 small rivers running into the bight were done on October 21-22, 2020. Extremely high concentration of nutrients was detected in the Peschanka, Saperka and Gryaznukha Rivers that was obviously caused by waste waters discharge. These rivers were the main source of the bight eutrophication. Within the bight, the highest anomalies of chemical parameters, as low oxygen content, low pH, high concentrations of nutrients (N, P, Si), high turbidity, and high CO2 partial pressure were observed close to these rivers mouths, in particular under the ice in winter, when wind mixing was absent. The hypoxia disappeared in the warm period of year because of wind mixing. High concentrations of total nitrogen (10.0-40.0 μmol/L), total phosphorus (1.5-2.0 gmol/L), dissolved organic carbon (3-5 mgC/L), and chlorophyll a (0.5-2.0 μg/L) in all seasons were the results of active production-destruction processes, obviously with prevalence of organic matter destruction, since the water in the bight was undersaturated with oxygen and supersaturated with carbon dioxide — the bight accumulates and mineralizes organic matter from terrestrial and riverine discharge. Underwater photographs did not detect Zostera meadows at the bottom, which were observed in the northwestern Uglovoy bight in the past. Comparison of historical data on episodic studies in the bight with results of the surveys indicates degradation of its ecosystem, with such signs as disappearance of seagrass, hypoxia in winter, and CO2 flux into the atmosphere. Reduce in water exchange between the bight and the Amur Bay caused by construction of the underwater pipeline in 1982 and the bridge in 2012 is suggested as a reason of the degradation. |
| format | Article |
| id | doaj-art-19d04e76fb05426f857b2bce845c76a2 |
| institution | Kabale University |
| issn | 1606-9919 2658-5510 |
| language | Russian |
| publishDate | 2021-03-01 |
| publisher | Transactions of the Pacific Research Institute of Fisheries and Oceanography |
| record_format | Article |
| series | Известия ТИНРО |
| spelling | doaj-art-19d04e76fb05426f857b2bce845c76a22025-08-20T03:59:16ZrusTransactions of the Pacific Research Institute of Fisheries and OceanographyИзвестия ТИНРО1606-99192658-55102021-03-01201113815710.26428/1606-9919-2021-201-138-157571Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasonsP. Ya. Tishchenko0Yu. A. Barabanshchikov1G. Yu. Pavlova2A. A. Ryumina3S. G. Sagalaev4P. Yu. Semkin5P. P. Tishchenko6O. A. Ulanova7M. G. Shvetsova8E. M. Shkirnikova9E. Yu. Tibenko10Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Pacific Oceanological Institute, Russian Ac. Sci.Hydrological and chemical surveys were conducted in the Uglovoy Bight in October, 2019, February, May and June, 2020 (in total 120 stations) and chemical analyses of water from 13 small rivers running into the bight were done on October 21-22, 2020. Extremely high concentration of nutrients was detected in the Peschanka, Saperka and Gryaznukha Rivers that was obviously caused by waste waters discharge. These rivers were the main source of the bight eutrophication. Within the bight, the highest anomalies of chemical parameters, as low oxygen content, low pH, high concentrations of nutrients (N, P, Si), high turbidity, and high CO2 partial pressure were observed close to these rivers mouths, in particular under the ice in winter, when wind mixing was absent. The hypoxia disappeared in the warm period of year because of wind mixing. High concentrations of total nitrogen (10.0-40.0 μmol/L), total phosphorus (1.5-2.0 gmol/L), dissolved organic carbon (3-5 mgC/L), and chlorophyll a (0.5-2.0 μg/L) in all seasons were the results of active production-destruction processes, obviously with prevalence of organic matter destruction, since the water in the bight was undersaturated with oxygen and supersaturated with carbon dioxide — the bight accumulates and mineralizes organic matter from terrestrial and riverine discharge. Underwater photographs did not detect Zostera meadows at the bottom, which were observed in the northwestern Uglovoy bight in the past. Comparison of historical data on episodic studies in the bight with results of the surveys indicates degradation of its ecosystem, with such signs as disappearance of seagrass, hypoxia in winter, and CO2 flux into the atmosphere. Reduce in water exchange between the bight and the Amur Bay caused by construction of the underwater pipeline in 1982 and the bridge in 2012 is suggested as a reason of the degradation.https://izvestiya.tinro-center.ru/jour/article/view/617eutrophicationnutrientco<sub>2</sub> partial pressuredissolved oxygenproduction/ destruction processuglovoy bight |
| spellingShingle | P. Ya. Tishchenko Yu. A. Barabanshchikov G. Yu. Pavlova A. A. Ryumina S. G. Sagalaev P. Yu. Semkin P. P. Tishchenko O. A. Ulanova M. G. Shvetsova E. M. Shkirnikova E. Yu. Tibenko Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasons Известия ТИНРО eutrophication nutrient co<sub>2</sub> partial pressure dissolved oxygen production/ destruction process uglovoy bight |
| title | Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasons |
| title_full | Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasons |
| title_fullStr | Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasons |
| title_full_unstemmed | Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasons |
| title_short | Hydrochemical state of the Uglovoy Bight (Amur Bay) in different seasons |
| title_sort | hydrochemical state of the uglovoy bight amur bay in different seasons |
| topic | eutrophication nutrient co<sub>2</sub> partial pressure dissolved oxygen production/ destruction process uglovoy bight |
| url | https://izvestiya.tinro-center.ru/jour/article/view/617 |
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