This work package improves the representation of the marginal seas in the regional decadal prediction system for Europe based on COSMO-CLM (CCLM). During MiKlip, regional forecasting experiments with interactively coupled regional ocean-atmosphere models have shown that an active ocean component improves the simulations compared to atmosphere-only simulations (e.g., West African monsoon simulations). This added value will be investigated further by analyzing and improving the initial- and lateral boundary conditions for the coupled ocean-atmosphere model (CCLM with ocean model NEMO) and by introducing a river runoff scheme to close the hydrological cycle. With these studies the understanding of the high-resolution interactions between ocean, atmosphere and land surface will be improved, the coupled regional modeling system will allow representing more regional feedback mechanisms, and the single-model atmosphere-only CCLM ensemble for regional decadal predictions will be augmented with an additional physics perturbation member for the regional hindcast ensemble.
This work package C1-WP1 is handled by the Goethe University Frankfurt (GUF) in co-operation with DWD.
There are five sub-tasks:
D1: Coupled COSMO-CLM/NEMO comprising Mediterranean, North and Baltic Sea
D2: COSMO-CLM/NEMO with coupled river routing scheme
D3: Initalization procedure for the marginal seas
First steps in parallel online coupling of marginal seas accomplished.