A simple sediment process description suitable for 3D-ecosystem modelling — Development and testing in the Gulf of Finland

摘要: Abstract The ecosystem of the Gulf Finland is currently dominated by internal phosphorus loading from sediments. load highly redox sensitive, and its successful modelling on basin-wide scale requires a simplified description sediment process. We present here an approach in which redox-sensitive processes are directly linked to decomposition carbon instead oxygen concentration near-bottom water. Mineralisation organic known be major factor controlling nutrient cycling, including denitrification Fe(III) oxide reduction, giving rise high fluxes anoxic Our process only four main parameters, identified using situ CO 2 , dissolved inorganic nitrogen (DIN) (DIP) flux measurements carried out Goteborg University landers. model was tested with aid time series DIP rates measured western Finland. Modelled surface concentrations were compared monitoring data both eastern simulations showed that average net production entering euphotic layer 49 g C m − 2 − 1 . This induced rate 2.5 g N 0.67 g P corresponding 20,200 t for whole able describe seasonality precision. Further, modelled compatible available data. results indicate that, scales important coastal open sea conditions, our simple works well. new tool will help us use 3D models study effects external matter, subsequent benthic fluxes.