1. Meteorological Institute, Universität Hamburg, Hamburg, Germany
2. Meteorological Institute, Universität Bonn, Bonn, Germany
3. International Max Planck Research School on Earth System Modelling, Max Planck Institute for Meteorology, Hamburg, Germany
4. Department of Meteorology, University of Reading, Reading, UK
5. National Centre for Earth Observation, University of Reading, Reading, UK
6. Max Planck Institute for Meteorology, Hamburg, Germany