Modelling dissolved organic nutrients in the Gulf of Finland
https://doi.org/10.7868/S2073667318040111
Abstract
St.-Petersburg model of eutrophication (SPBEM) has been modified for improving description of organic matter as a part of the nutrient biogeochemical cycles. The dynamics of labile and refractory fractions of dissolved organic nitrogen and phosphorus are now described with four additional equations. The modification was tested at the Gulf of Finland in a numerical experiment made with plausible initial and actual boundary conditions for the years 2009—2014. Comparison of simulation with the available field observations indicates quite reasonable reproducibility of seasonal and inter-annual variations of spatial distribution of hydrophysical and biogeochemical characteristics, including almost a perfect match between simulated and observed dynamic of organic nutrients. The most important distinction from natural prototypes is the overestimated total amounts of inorganic nitrogen and phosphorus, which can be caused by the deficiencies in the prescription of initial and boundary conditions as well as in the current parameterizations of pathways and rates of mineralization fluxes. The finer tuning of SPBEM-2 requires more extensive sensitivity analysis.
Supporting agencies: The authors O.M Vladimirova and T.R. Eremina were supported by Government Target Project N 5.6010.2017/ БЧ of the Ministry of Education and Science of the Russian Federation. The authors A.V. Isaev and V.A. Ryabchenko performed this research in the framework of the state assignment of FASO Russia (theme No. 0149-2018-0014) and were additionally supported by the grant 14-50-00095 of the Russian Science Foundation. The Baltic Nest Institute is supported by the Swedish Agency for Marine and Water Management through their grant 1:11— Measures for marine and water environment.
About the Authors
O. M. Vladimirova
Russian State Hydrometeorological University
Russian Federation
Russian Federation
St.-Petersburg
T. R. Eremina
Russian State Hydrometeorological University
Russian Federation
Russian Federation
St.-Petersburg
A. V. Isaev
Shirshov Institute of Oceanology, Russian Academy of Sciences
Russian Federation
Russian Federation
Moscow
V. A. Ryabchenko
Shirshov Institute of Oceanology, Russian Academy of Sciences
Russian Federation
Russian Federation
Moscow
O. P. Savchuk
Institute of Earth Sciences, St.-Petersburg State University; Baltic Nest Institute, Stockholm University Baltic Sea Centre
Russian Federation
Russian Federation
St.-Petersburg; Stockholm, Sweden
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Review
For citations:
Vladimirova O.M., Eremina T.R., Isaev A.V., Ryabchenko V.A., Savchuk O.P. Modelling dissolved organic nutrients in the Gulf of Finland. Fundamental and Applied Hydrophysics. 2018;11(4):90-101. https://doi.org/10.7868/S2073667318040111
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