1. Department of Earth Physics and Astrophysics, Universidad Complutense de Madrid, and Institute of Geosciences, Centro Mixto del Consejo Superior de Investigaciones Científicas (CSIC) and Universidad Complutense de Madrid, Madrid, Spain
2. Meteorological Institute, Ludwig-Maximilians-Universität München, Munich, Germany
3. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, and Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, Colorado