Abstract
Analysis of the vertical distributions of the ratios between C, S, Si, N, and P revealed the layers with significant systematic differences from the theoretical Redfield and Richards values. These anomalies can testify to the presence of such processes as denitrification/anammox and the processes of the “phosphate dipole” formation. Based on the ratios to Si, which concentrations do not change under the redox conditions variability, we estimated numerically the other elements deficiencies and the rates of the processes that form these deficiencies. The calculated rates of denitrification/anammox (0.012–0.046 μM per day) correspond well to the present observations data. The calculated possible rates of the processes controlling the shallower phosphate minimum formation equal to 0.008–0.032 μM per day, and the rates of the deeper phosphate minimum formation are in the range of 0.006–0.024 μM per day. The Ct/St ratio showed that bacterial sulfate reduction was the only significant process in the anaerobic mineralization of organic matter in the anoxic zone of the Black Sea that lead to a constant stoichiometric C/S ratio close to the theoretical one of 2.
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Acknowledgments
Authors express their gratitude to professor I. Volkov for valuable remarks and discussions while writing on the subject. This research was supported by the FTP “World Ocean”; RFBR: CRDF (RUG1-2828-KS-06).
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Chelysheva, M.V., Yakushev, E.V., Vinogradova, E.L., Chasovnikov, V.K. (2011). Biogeochemical Peculiarities of the Vertical Distributions of Nutrients in the Black Sea. In: Yakushev, E. (eds) Chemical Structure of Pelagic Redox Interfaces. The Handbook of Environmental Chemistry, vol 22. Springer, Berlin, Heidelberg. https://doi.org/10.1007/698_2011_119
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DOI: https://doi.org/10.1007/698_2011_119
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