1. Atmospheric, Oceanic and Planetary Physics, Department of Physics; University of Oxford; Oxford UK
2. Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna; Italy and Ca' Foscari University; Venezia Italy
3. Department of Meteorology; University of Reading; Reading UK
4. Met Office Hadley Centre; Exeter UK
5. Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna; Italy and Istituto di Scienze dell'Atmosfera e del Clima; Rome Italy
6. Danish Meteorological Institute; Danish Climate Centre; Copenhagen Denmark
7. National Centre for Atmospheric Science, Department of Physics; University of Oxford; Oxford UK