Investigation of nutrient transports from the North Sea into the Baltic Sea ecosystem and estimation of their area of influence

该项目的目的是调查北海和波罗的海在富营养化方面的耦合。为此，奥胡斯大学开发和使用的北海和波罗的海物理-生物地球化学耦合模型应通过营养物标记方法进行扩展，该方法可以跟踪从北海进入波罗的海的营养物的扩散情况。我们特别想了解营养物质来自哪个源区（德国湾、北海中部或波罗的海流出物的再循环）、它们被输送到波罗的海多远以及它们在什么时间后再次离开波罗的海。此外，我们的目标是量化单次流入事件期间进入的养分量与永久水交换进入的养分量的关系，并希望找出这些养分的空间分布模式有何不同，同时考虑到生物过程。

The aim of the project is to investigate the coupling of North Sea and Baltic Sea regarding the eutrophication aspect. For this purpose, a coupled physical-biogeochemical model of the North Sea and Baltic Sea, as it is developed and used at Aarhus University, shall be extended by a nutrient tagging method which allows to track the spreading of the nutrients in the Baltic Sea which entered from the North Sea. Especially we want to find out from which source area (German Bight, Central North Sea, or recirculation from the Baltic Outflow) the nutrients originate, how far they are transported into the Baltic Sea and after what residence time they leave the Baltic Sea again. Also, we aim at a quantification of the amount of nutrients entering during single inflow events in relation to those entering with the permanent water exchange, and want to find out how the spatial distribution patterns of these nutrients differ, also under concideration of biological processes.