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情况。为此目的，在奥胡斯大学开发和使用的北海和波罗的海的物理-生物地球化学耦合模型将通过营养标记方法加以扩展，该方法允许跟踪从北海进入波罗的海的营养物质的扩散情况。特别是，我们想要找出营养物质来自哪个来源区域(德国湾、北海中部或波罗的海外流的再循环)，它们被输送到波罗的海的距离有多远，以及在什么时间之后它们再次离开波罗的海。此外，我们的目标是量化在单次入流过程中进入的营养物的量与那些以永久性水交换进入的进入的营养物的量，并想要找出这些营养物的空间分布模式如何不同，也是在考虑生物过程的情况下。

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.