Nutrient fluxes from the Danube Basin to the Black Sea

This paper deals with the state of the art of quantification of sources, pathways and sinks of nutrients in the Danube Basin and their transport from the catchment to the Black Sea. It shows main results of emission estimates to surface waters and the Danube Water Quality Model approach to link these emissions estimates to measured water monitoring data. The current paper provides a quantitative synthesis of available knowledge regarding the fate of nutrients in the Danube Basin. Even though many knowledge gaps existed, our understanding of the system has increased. As such, the paper provides a vehicle to carry the discussion one step beyond just complaining about how much we do hot know yet.