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Oxygen Saturation Variability of Waters in the Estuary of the Northern Dvina River. P. 88–97

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Section: Geosciences




Ol’ga P. Netsvetaeva*
*Northern (Arctic) Federal University named after M.V. Lomonosov (Arkhangelsk, Russian Federation)
Corresponding author: Ol’ga Netsvetaeva, address: Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation;


The Northern Dvina, as a river with the maximum flow in the watershed of the White Sea, has a significant influence on the hydrochemical structure of the Dvina Cove and the great part of the sea. Its estuary is a marginal filter experiencing a strong influence of semidiurnal tides and anthropogenic load not only of the Arkhangelsk agglomeration, but also of the entire Arkhangelsk region. To assess the quality of waters in this area, we suggest considering oxygen saturation of water as an indicator of the intensity of the production and destruction processes. The temporal (interannual, seasonal, mesoscale, or tidal) and spatial oxygen saturation variability of the estuarine waters of the Northern Dvina river have been studied. We have also investigated the dependence of the oxygen saturation variability on the flow rate within the mesoscale irregularity. The research is based on data obtained during the expedition of the North-West Branch of the P.P. Shirshov Institute of Oceanology of the Russian Academy of Sciences in March 2014 and October 2015. The waters in March are classified as “dirty” (due to natural causes), and in October ‒ to the category “clean”. Significant seasonal, as well as insignificant mesoscale (tidal) and spatial variability of oxygen saturation have been noted. We have analyzed the archival data on oxygen saturation at the points of the state service for natural environment monitoring during the period of 2000‒2014. The study results indicate the prevalence of seasonal variability over the interannual variability, as well as the absence of the effect of flow rate variability on the tidal variability of oxygen saturation.


oxygen saturation of river waters, environmental monitoring of river waters, estuary of the Northern Dvina River
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