Systematic combination of models with observations
The biogeochemical modules in the Earth system model NorESM (ocean: HAMOCC, originally developed at MPI in Hamburg, adopted in Bergen for isopycnic coordinates; land: CAM4, originally developed at NCAR) need to be systematically improved with respect to observations.
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In order to achieve a best possible biogeochemical state estimation and parameter optimisation a collaboration with the Nansen Centre in Bergen has been started on data assimilation using the Ensemble Kalman Filtering technique. It is expected that the group in the next years will contribute to improved annual updates of global carbon budgets also for international climate assessments. Data syntheses to which the group has made and is making key contributions are of essential value for this.