1. Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland.
2. Seminar for Statistics, ETH Zurich, Zurich, Switzerland.
3. Swiss Data Science Center, ETH Zurich and EPFL, Lausanne, Switzerland.
4. Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14850, USA.
5. Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO 80305, USA.