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Seasonal variations of the concentrations of dissolved inorganic nutrients in the lower Severnaya Dvina and in the river-sea mixing zone

Published in «Water: chemistry and ecology» № 4-6 / 2018 , p. 75-85.
Heading:

 

Gordeev V.V.
Chulcova A.L.
Kochenkova A.I.
Belorukov S.K.
Chupakova A.A.
Moreva O.Yu.
Neverova N.V
Chupakov A.V.

Summary:
The results of the first two years of work in the frames of the project “Observatory –the Marginal Filter of Severnaya Dvina River” are presented. The main aim of this project is the regular investigations of sedimentological, geochemical and biological processes in the marginal filter zone of the Severnaya Dvina River in its lower flow and its marginal filter (MF). The MF is the the river - sea mixing zone which is the natural trap for all kinds of dissolved and particulate material on its way from continent to sea or ocean. This paper is devoted to the results of determination of the dissolved mineral forms of N, P and Si. The samples of surface water were taken every month during two years in two points – in the Arkhangelsk city (Yacht-club) and in the port Economya. In the MF the samples were taken two times in a year – in spring immediately after the ice coming off and in the period of low water in August. Water was filtered through the Nuclepore filters at the day of sampling and the nutrient elements were determined by the generally accepted methods. The results show that concentrations of nitrites, nitrates, phosphates and silica are greatly changed in seasons and between years. The ratios between maximum and minimum concentrations during two years of observations were in a range 11-16 for NO2-N, PO4-P and Si, and especially great for NO3-N– up to 620. A comparison with the typical for World Rivers concentrations have shown that concentrations of nitrites and phosphates were in 2-3 times higher than global ones, concentrations of nitrates were close to global level and silica only was approximately in 1.5 times lower the global concentration. The correlation between molar ratios of N/P, Si/P and Si/N (Redfield ratios) have shown that N only was the limiting factor for normal activity of phytoplankton in the ecosystem of the lower flow of the river. The concentrations of the elements in the MF zone were determined in the whole range of salinity from river waters up to sea waters. It was found that at high water in spring residence time of water in MF was much lower than in period of low water. This time was not enough for normal development of biochemical processes which provided influence on the concentrations and forms of elements in the MF zone. At low water in August the dependences of the concentrations from salinity begun to be more complicated and variable. The works in the frames of this project are continued.

Keywords: annual fluxes of elements, marginal filter of the Severnaya Dvina, nutrient elements, seasonal variations

Bibliographic link:
Gordeev V.V. , Chulcova A.L., Kochenkova A.I. , Belorukov S.K., Chupakova A.A., Moreva O.Yu., Neverova N.V, Chupakov A.V. Seasonal variations of the concentrations of dissolved inorganic nutrients in the lower Severnaya Dvina and in the river-sea mixing zone // Water: chemistry and ecology. — 2018. — № 4-6. — c. 75-85. — http://watchemec.ru/en/article/28932/

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