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  1. Article: The Carbonate System of the Estuaries of the Syran and Ul’ban Rivers (Ul’banskii Bay, the Sea of Okhotsk) during Spring Flood

    Semkin, P. Yu / Tishchenko, P. Ya / Pavlova, G. Yu / Tishchenko, P. P. / Sagalaev, S. G. / Shkirnikova, E. M. / Shvetsova, M. G.

    Water resources. 2022 Oct., v. 49, no. 5

    2022  

    Abstract: In the period of summer flood 2016, a number of chemical characteristics associated with carbon cycle were studied in the estuaries of the Syran and Ul’ban rivers in the area of the Shantarskii Archipelago with the total water discharge of 194.7 m³/s. ... ...

    Abstract In the period of summer flood 2016, a number of chemical characteristics associated with carbon cycle were studied in the estuaries of the Syran and Ul’ban rivers in the area of the Shantarskii Archipelago with the total water discharge of 194.7 m³/s. The zone of mixing at the salinity of <20‰ is the source of CO₂ for the atmosphere with the estimated CO₂ flux up to 112.7 mmol m⁻² day⁻¹. At the salinity >20‰, the thickness of the photic layer increases abruptly and photosynthesis starts to dominate, resulting in the formation of CO₂ flow from the atmosphere into water with a rate of up to 30 mmol m⁻² day⁻¹. A model CO₂ flow at the water/atmosphere interface is presented at a wind speed from 2 to 15 m/s for the entire mixing zone, the water in which generally absorb atmospheric CO₂. A specific feature of the basin compared with the estuaries of the Uda and Usalgin rivers in the zone of the Shantarskii Archipelago is the combination of the relatively low volume of water and solid runoff with a relatively high phosphorus flux in mineral and organic forms.
    Keywords basins ; carbon cycle ; carbon dioxide ; carbonates ; phosphorus ; photosynthesis ; runoff ; salinity ; summer ; wind speed ; Okhotsk Sea
    Language English
    Dates of publication 2022-10
    Size p. 869-879.
    Publishing place Pleiades Publishing
    Document type Article
    ZDB-ID 2058341-2
    ISSN 1608-344X ; 0097-8078
    ISSN (online) 1608-344X
    ISSN 0097-8078
    DOI 10.1134/S0097807822050141
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Radium Isotopes and Nutrients in Razdolnaya River Estuary (Amur Bay, the Sea of Japan) in the Period of Summer Flood

    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 June, v. 49, no. 3

    2022  

    Abstract: The activity of dissolved radium isotopes ²²³Ra, ²²⁴Ra, ²²⁸Ra, the concentrations of nutrients: ammonium, nitrates, nitrites, phosphates, silicates, total nitrogen, and total phosphorus are studied in the Razdolnaya River estuary at suspension ... ...

    Abstract The activity of dissolved radium isotopes ²²³Ra, ²²⁴Ra, ²²⁸Ra, the concentrations of nutrients: ammonium, nitrates, nitrites, phosphates, silicates, total nitrogen, and total phosphorus are studied in the Razdolnaya River estuary at suspension concentration in river water >1000 mg/L. During flood, classical two-layer estuarine circulation was observed over the nearshore; this circulation was formed by a discharge current and compensation flow from the depth of 20 m to the depth of 8 m. The main source of ²²⁸Ra inflow into the estuary is desorption from river suspension in the beginning of the mixing zone near the mouth bar, where its activity reached 163 ± 0.03 dpm 100 L–¹, which is 139 times that in the river water. The zone near the river mouth bar shows higher activity of ²²⁴Ra and ²²³Ra (4 and 17 times greater than that in river water) and an increase in the concentrations of total phosphorus, [Formula: see text], DSi, [Formula: see text], and total nitrogen. An extremum in the activity of ²²⁴Ra (65.41 ± 0.68 dpm 100 L–¹) and an increase in ²²³Ra (1.97 ± 0.11 dpm 100 L–¹) were recorded in the bottom water of the nearshore; therefore, the main source of these isotopes is bottom sediments. Direct correlation was found to exist in the pairs [Formula: see text] – ²²⁴Ra and [Formula: see text] – ²²⁴Ra, and simultaneous extremum was recorded in ²²⁴Ra, [Formula: see text], and [Formula: see text] in bottom nearshore waters; this extremum is attained in the area with highest density of colonies of polychaetes polychaetes―active bioirrigtors of pore waters.
    Keywords Polychaeta ; ammonium ; desorption ; estuaries ; radium ; river water ; rivers ; total nitrogen ; total phosphorus ; Sea of Japan
    Language English
    Dates of publication 2022-06
    Size p. 429-439.
    Publishing place Pleiades Publishing
    Document type Article
    ZDB-ID 2058341-2
    ISSN 1608-344X ; 0097-8078
    ISSN (online) 1608-344X
    ISSN 0097-8078
    DOI 10.1134/S0097807822030137
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Discharge of Salt Groundwater in the Estuary of the Razdol’naya River (Amur Bay) in February 2020

    Semkin, P. Yu / Tishchenko, P. Ya / Charkin, A. N / Pavlova, G. Yu / Tishchenko, P. P / Anisimova, E. V / Barabanshchikov, Yu. A / Leusov, A. E / Mikhailic, T. A / Tibenko, E. Yu / Chizhova, T. L

    Water resources. 2021 May, v. 48, no. 3

    2021  

    Abstract: In February 2020, geochemical tracers along with hydrochemical and hydrological characteristics were used to reveal a discharge site of salt groundwaters in the head of the Razdol’naya R. estuary at a distance of 22 km from its mouth bar. The elevated ... ...

    Abstract In February 2020, geochemical tracers along with hydrochemical and hydrological characteristics were used to reveal a discharge site of salt groundwaters in the head of the Razdol’naya R. estuary at a distance of 22 km from its mouth bar. The elevated activity of ²²⁴Ra isotopes from 11.1 ± 0.1 to 2.2 ± 0.05 Bq/m³ in the bottom water layer over a distance of 15 km indicates to the propagation of slightly saline waters from a pool 8 m in depth toward the receiving basin. The distribution of stable water isotopes (δ¹⁸O and δD) and ions of basic salt composition showed that water of the top aquifer at the site of discharge area can suffer the effect of seawater. The major cause of the observed phenomenon is supposed to be the penetration of seawater into the top aquifer within the estuary during winter low-water season and the seepage of this water in the region with largest depth. The contrast of the temperature of ground and surface water was accompanied by a positive temperature anomaly in the zone of their interaction and a decrease in ice thickness along the mixing zone.
    Keywords aquifers ; basins ; estuaries ; groundwater ; hydrochemistry ; ice ; rivers ; seawater ; seepage ; surface water ; temperature
    Language English
    Dates of publication 2021-05
    Size p. 345-350.
    Publishing place Pleiades Publishing
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2058341-2
    ISSN 1608-344X ; 0097-8078
    ISSN (online) 1608-344X
    ISSN 0097-8078
    DOI 10.1134/S009780782103012X
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Water Dynamics and Structure in the Estuary of the Partizanskaya River (Nakhodka Bay, Sea of Japan)

    Semkin, P. Yu / Tishchenko, P. Ya / Lobanov, V. B / Sergeev, A. F / Barabanshchikov, Yu. A / Mikhailik, T. A / Pavlova, G. Yu / Kostyleva, A. V / Shkirnikova, E. M / Tishchenko, P. P / Chizhova, T. L

    Water resources. 2019 Jan., v. 46, no. 1

    2019  

    Abstract: Field studies of the seasonal and daily dynamics of the mixing zone were carried out in the microtidal estuary of the Partizanskaya River. The position of the mixing zone was determined by river runoff volume. The upstream boundary of the mixing zone was ...

    Abstract Field studies of the seasonal and daily dynamics of the mixing zone were carried out in the microtidal estuary of the Partizanskaya River. The position of the mixing zone was determined by river runoff volume. The upstream boundary of the mixing zone was located at a distance from 5 (at river discharge of 73.67 m3/s) to 12.5 km (at 7.7 m3/s) from the mouth bar. The estuary features a two-layer water circulation, resulting in the formation of halocline with a gradient of water salinity of up to 30‰ per 1 m. Salinity variations at rifts, caused by tides, reach 27‰ over a 3-hour period.
    Keywords estuaries ; mixing ; river flow ; rivers ; runoff ; tides ; water salinity ; Sea of Japan
    Language English
    Dates of publication 2019-01
    Size p. 29-38.
    Publishing place Pleiades Publishing
    Document type Article
    ZDB-ID 2058341-2
    ISSN 1608-344X ; 0097-8078
    ISSN (online) 1608-344X
    ISSN 0097-8078
    DOI 10.1134/S0097807819010135
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Production-destruction processes in estuaries of the rivers of Artemovka and Shkotovka (Usuri Bay) in summer

    Semkin, P. Yu / Tishchenko, P. Ya / Khodorenko, N. D / Zvalinskii, V. I / Mikhailik, T. A / Sagalaev, S. G / Stepanova, V. I / Tishchenko, P. P / Shvetsova, M. G / Shkirnikova, E. M

    Water resources. 2015 May, v. 42, no. 3

    2015  

    Abstract: Production and hydrochemical characteristics of the estuaries of the rivers of Artemovka and Shkotovka, flowing into the apex of the Ussuri Bay (the Sea of Japan), were studied in the summer of 2011. Because of the high rate of destruction processes, the ...

    Abstract Production and hydrochemical characteristics of the estuaries of the rivers of Artemovka and Shkotovka, flowing into the apex of the Ussuri Bay (the Sea of Japan), were studied in the summer of 2011. Because of the high rate of destruction processes, the partial pressure in river waters of the Shkotovka, Artemovka, and Knevichanka (the Artemovka’s major tributary) was 800, 1800, and 3700 μatm, respectively. Unlike the Shkotovka R. estuary, the high trophic level of the Artemovka R. and a favorable combination of hydrological and hydrochemical conditions in the study period determined the high rate of production processes (chlorophyll a concentration reached 200 μg/L, oxygen oversaturation was more than twofold, the partial pressure of carbon dioxide dropped to 25 μatm). A conservative and nonconservative dependence of alkalinity on salinity was also found to exist in the water of the Shkotovka and Artemovka rivers, respectively.
    Keywords alkalinity ; carbon dioxide ; chlorophyll ; estuaries ; oxygen ; river water ; rivers ; salinity ; summer ; trophic relationships ; Sea of Japan
    Language English
    Dates of publication 2015-05
    Size p. 352-361.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 2058341-2
    ISSN 1608-344X ; 0097-8078
    ISSN (online) 1608-344X
    ISSN 0097-8078
    DOI 10.1134/S0097807815030161
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Hydrochemical regime of the Partizanskaya R. estuary, Nakhodka Bay, the Sea of Japan

    Pavlova, G. Yu. / Tishchenko, P. Ya. / Semkin, P. Yu. / Shkirnikova, E. M. / Mikhailik, T. A. / Barabanshchikov, Yu. A.

    Water resources

    Volume v. 42,, Issue no. 4

    Abstract: Seasonal hydrochemical studies of the basic salt composition of water in the Partizanskaya R. estuary (Nakhodka Bay, the Sea of Japan), carried out in 2012, showed no within-year changes in the ratio of major ions, and hence the type of mineralization, ... ...

    Abstract Seasonal hydrochemical studies of the basic salt composition of water in the Partizanskaya R. estuary (Nakhodka Bay, the Sea of Japan), carried out in 2012, showed no within-year changes in the ratio of major ions, and hence the type of mineralization, in the river against a background of a pronounced seasonal variation of total mineralization. The mixing of river and sea water in the estuary is shown to be of a conservative character.
    Keywords estuaries ; seawater ; seasonal variation ; brackish water ; mixing ; mineralization ; rivers ; ions
    Language English
    Document type Article
    ISSN 0097-8078
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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  7. Article: Production-destruction processes in estuaries of the rivers of Artemovka and Shkotovka (Usuri Bay) in summer

    Semkin, P. Yu. / Tishchenko, P. Ya. / Khodorenko, N. D. / Zvalinskii, V. I. / Mikhailik, T. A. / Sagalaev, S. G. / Stepanova, V. I. / Tishchenko, P. P. / Shvetsova, M. G. / Shkirnikova, E. M.

    Water resources

    Volume v. 42,, Issue no. 3

    Abstract: Production and hydrochemical characteristics of the estuaries of the rivers of Artemovka and Shkotovka, flowing into the apex of the Ussuri Bay (the Sea of Japan), were studied in the summer of 2011. Because of the high rate of destruction processes, the ...

    Abstract Production and hydrochemical characteristics of the estuaries of the rivers of Artemovka and Shkotovka, flowing into the apex of the Ussuri Bay (the Sea of Japan), were studied in the summer of 2011. Because of the high rate of destruction processes, the partial pressure in river waters of the Shkotovka, Artemovka, and Knevichanka (the Artemovka’s major tributary) was 800, 1800, and 3700 μatm, respectively. Unlike the Shkotovka R. estuary, the high trophic level of the Artemovka R. and a favorable combination of hydrological and hydrochemical conditions in the study period determined the high rate of production processes (chlorophyll a concentration reached 200 μg/L, oxygen oversaturation was more than twofold, the partial pressure of carbon dioxide dropped to 25 μatm). A conservative and nonconservative dependence of alkalinity on salinity was also found to exist in the water of the Shkotovka and Artemovka rivers, respectively.
    Keywords estuaries ; oxygen ; summer ; river water ; alkalinity ; trophic relationships ; salinity ; rivers ; chlorophyll ; carbon dioxide
    Language English
    Document type Article
    ISSN 0097-8078
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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