Group Leader: Marco Giorgetta
Numerical models are used to express our understanding of the climate system in a computationally accessible form, and as a numerical laboratory to analyze experimentally the effects of modifications of many kinds (model formulation, spatial resolution, choice of initial or boundary conditions). The Climate Modeling Group develops the ECHAM6 model, which is the atmospheric component of the Max Planck Earth system model (MPI-ESM1), and the new ICON atmosphere model, with a research focus on the coupling of physical and dynamical processes. For this the group operates in close collaboration with the developers of other groups and departments at MPI-M, and - in the case of ICON - institutions, especially the German Weather Service (DWD) and the German Climate Computing Center (DKRZ). Additionally, the group uses the models for research on the dynamics of tropical waves and the wave meanflow interaction associated with the quasi-biennial oscillation.
The ECHAM6 model development is continued since ECHAM6.1 that was used for CMIP5. Several bug fixes in physical parameterizations lead to energy conservation in the total parameterized physics (ECHAM6.2) and a re-calibration of the cloud processes resulted in a "normal" climate sensitivity (ECHAM6.3). These physical improvements are accompanied by technical improvements, as for example the parallel output scheme (ECHAM6.3).
As the development of the ECHAM6 and MPI-ESM1 has progressed, the research focus moves to the ICON model system, in particular to three ICON model configurations: ICON-LES, ICON-CSR and ICON-GCM:
As this suite of models will span a large range of spatial resolutions and time steps, we will investigate different couplings between the dynamical core, which is the same in all configurations, and the physical processes, which need to be adapted to the cases. This topic will be investigated in collaboration with the Applied Mathematics and Computational Physics group.