Articles | Volume 4, issue 3
Geosci. Model Dev., 4, 771–784, 2011

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Geosci. Model Dev., 4, 771–784, 2011

Model description paper 09 Sep 2011

Model description paper | 09 Sep 2011

The Atmosphere-Ocean General Circulation Model EMAC-MPIOM

A. Pozzer1,2, P. Jöckel2,*, B. Kern2, and H. Haak3 A. Pozzer et al.
  • 1The Cyprus Institute, Energy, Environment and Water Research Center, Nicosia, Cyprus
  • 2Atmospheric Chemistry Department, Max-Planck Institute for Chemistry, Mainz, Germany
  • 3Ocean in the Earth System, Max-Planck Institute for Meteorology, Hamburg, Germany
  • *now at: Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany

Abstract. The ECHAM/MESSy Atmospheric Chemistry (EMAC) model is coupled to the ocean general circulation model MPIOM using the Modular Earth Submodel System (MESSy) interface. MPIOM is operated as a MESSy submodel, thus the need of an external coupler is avoided. The coupling method is tested for different model configurations, proving to be very flexible in terms of parallel decomposition and very well load balanced. The run-time performance analysis and the simulation results are compared to those of the COSMOS (Community earth System MOdelS) climate model, using the same configurations for the atmosphere and the ocean in both model systems. It is shown that our coupling method shows a comparable run-time performance to the coupling based on the OASIS (Ocean Atmosphere Sea Ice Soil, version 3) coupler. The standard (CMIP3) climate model simulations performed with EMAC-MPIOM show that the results are comparable to those of other Atmosphere-Ocean General Circulation models.