Abstract
The paper presents new data on concentrations and fluxes of organic carbon, iron, and manganese in waters of the mouth area of the Northern Dvina River. The work was conducted within the project “Northern Dvina River Marginal Filter Observatory” from May 2015 to May 2019 with monthly collection of water samples. Systematic determinations of the concentrations of the main carrier elements of many trace elements in dissolved and particulate forms were used to establish the average weighted of Corg, Fe, and Mn concentrations. The results of 4 years of systematic investigations established the main regularities of seasonal variations of dissolved and particulate forms of element concentrations and the relationships between. Significant variations were observed not only between concentrations but also between fluxes of elements in both forms. However, more than half the annual fluxes of all elements in all years studied was transported to the sea in the spring flood period. The results also demonstrated significant variations between element concentrations and their fluxes in different years. This is unsurprising, since even during the 4 years of investigations, the difference between water runoff and SPM fluxes in different years was up to, respectively, 1.4 and 2.6 times.
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ACKNOWLEDGMENTS
The authors are grateful A.P. Lisitsyn for valuable advice and support and to V.B. Korobov for help in organizing the sampling.
Funding
The material was obtained under the state task of IO RAS (topic no. 0149-2019-0007). Processing and interpretation of material was supported by the Russian Science Foundation (grant no. 19-17-00234).
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Gordeev, V.V., Kochenkova, A.I., Lokhov, A.S. et al. Seasonal and Inter Annual Variations between Concentrations and Fluxes of Dissolved and Particulate Organic Carbon, Iron and Manganese from the Northern Dvina River to the White Sea. Oceanology 61, 34–47 (2021). https://doi.org/10.1134/S0001437021010069
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DOI: https://doi.org/10.1134/S0001437021010069