1. LSCE-IPSL, CEA Saclay l’Orme des Merisiers, CNRS UMR 8212 CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, France;
2. London Mathematical Laboratory, London, UK;
3. Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden;
4. Royal Meteorological Institute of Belgium, Bruxelles, Belgium