1. Institute for Simulation and Graphics and Institute of Analysis und Numerics, Otto-von-Guericke-University, Magdeburg, Germany
2. European Centre for Medium-Range Weather Forecasts, Bonn, Germany
3. Institute for Simulation and Graphics, Otto-von-Guericke University, Magdeburg, Germany
4. Institute of Analysis und Numerics, Otto-von-Guericke University, Magdeburg, Germany