Modelling the biogeochemistry of a tidal flat ecosystem with EcoTiM |
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| Authors: | Email author" target="_blank">Cora?KohlmeierEmail author Wolfgang?Ebenh?h |
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| Institution: | (1) ICBM—Institute for Chemistry and Biology of the Marine Environment, Carl-von-Ossietzky University of Oldenburg, P.O. Box 2503, 26111 Oldenburg, Germany |
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| Abstract: | The ecological tidal model simulates the cycling of carbon, nitrogen, phosphate, and silicate and describes the tidal, diurnal,
and annual dynamics of the back barrier area of the island Spiekeroog in the German Bight. The region is characterized by
strong tidal currents and extensive tidal flats. It is strongly influenced by the conditions in the southern part of the German
Bight. This model study investigates the dependence of the model behavior on the boundary conditions and the forcing. The
effect of short- and long-term sea level rise on nutrient and plankton dynamics is analyzed. As the model is set up as semi-Lagrangian
with only a coarse approximation of the hydrodynamics, the seasonal and intratidal variability in the biogeochemical cycling
can only be reproduced qualitatively. By varying the boundary conditions, the intrinsic dynamics of the back barrier area
can be separated from boundary condition effects. This study shows that any agreement between model results and field data
cannot be expected without correct boundary conditions. The seasonal variability is of major importance, while higher-frequency
variability only plays a minor role. |
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| Keywords: | EcoTiM ERSEM Aquatic Ecosystem Model Back barrier system Tidal Spiekeroog Wadden Sea North Sea Lagrangian Eulerian Primary production Nutrients Phosphate Silicate |
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