A5 - The Land–Ocean Transition Zone
The project focuses on the physical and biogeochemical dynamics of the global land-ocean transition zone (LOTZ) and its role in the Earth system. We will address the hypothesis that the coastal ocean has changed from a carbon source to a carbon sink during the last decades. A central pillar will be the development of the modeling system ICON-coast, which will connect seamlessly the deep ocean with the coastal regions covering both global and regional scales.
To close critical gaps in our knowledge of biogeochemical process kinetics, matter variability and budgets, new data will be collected and selected process-based modeling will be carried out. Those processes that prove to be important for the carbon-cycling will be considered in the new ICON-coast and the Earth system model ICON-ESM.
The project will evaluate the potentially changing role of the coastal ocean in the global carbon cycle and will establish new climate change projections for the global coast. This information about the physical and biogeochemical constraints of carbon fluxes in coastal regions for possible futures is needed by Theme C and will contribute directly to answering the overarching question of CLICCS.