C1-WP1 - Interactive European marginal seas

Project aims

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.

Project structure

This work package C1-WP1 is handled by the Goethe University Frankfurt (GUF) in co-operation with DWD.

Tasks of the project

There are five sub-tasks:

  • Coupling marginal seas within one modeling system
  • Closing the water cycle/river discharge
  • Initialization and lateral boundary conditions of marginal seas
  • Atmospheric Lateral Boundary Conditions
  • Testing and System Set-up


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

Progress so far

First steps in parallel online coupling of marginal seas accomplished.