COSTRICE – three model online coupling using OASIS: problems and solutions H. T. M. Ho, B. Rockel, H. Kapitza, B. Geyer, and E. Meyer Institute for Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
Received: 01 Oct 2012 – Accepted: 03 Oct 2012 – Published: 17 Oct 2012
Abstract. The coupled system COSTRICE is developed for the first time in order to reproduce the interactions and feedbacks between
atmosphere, ocean and sea-ice in a two-way online coupled model system containing three component models for regional climate
simulations over Baltic Sea and North Sea regions. The regional climate model CCLM1 is coupled to the
regional ocean model TRIMNP1 and the sea ice model CICE1 via the coupler OASIS3. In this study, CCLM is setup with
a horizontal grid mesh size of 50 km and 32 vertical atmosphere layers and driven by the 6-h ERA-interim reanalysis
data as initial and boundary conditions. TRIMNP is setup with a horizontal grid mesh size of 12.8 km and 50 vertical
ocean levels. CICE calculates ice in 5 categories and runs with the same horizontal resolution as TRIMNP but only over the
Baltic Sea and the Kattegat Bay of the North Sea. In a two-way online coupling process, CCLM is linked to TRIMNP through sea
surface temperature (SST) as lower boundary condition every 3 h and TRIMNP is driven by 1-h atmospheric state variables and
fluxes of CCLM. The data exchange processes between TRIMNP and CICE as well as from CCLM to CICE take place with an interval of
3 h. The coupled model is applied in a study for climate simulations over Baltic Sea and North Sea regions in 1997. The
coupled system is set up to run in parallel on the super computing system IBM-power 6 at the German Climate Computing Center
1 See Table A1.
Citation: Ho, H. T. M., Rockel, B., Kapitza, H., Geyer, B., and Meyer, E.: COSTRICE – three model online coupling using OASIS: problems and solutions, Geosci. Model Dev. Discuss., 5, 3261-3310, doi:10.5194/gmdd-5-3261-2012, 2012.