1. Institute for Atmosphere and Climate Science, ETH Zürich, Zurich, Switzerland
2. Institute for Atmosphere and Climate Science, ETH Zürich, Zurich, Switzerland, and Institute for Atmospheric Physics, University of Mainz, Mainz, Germany
3. Federal Office of Meteorology and Climatology MeteoSwiss, Zurich, Switzerland
4. Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany
5. Institute for Atmosphere and Climate Science, ETH Zürich, Zurich, Switzerland, and Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway