1. Department of Earth Sciences, Royal Holloway; University of London; Egham UK
2. US National Oceanic and Atmospheric Administration, Earth System Research Laboratory; Boulder Colorado USA
3. Climate Change Research Institute, School of Geography Environment and Earth Sciences; Victoria University of Wellington; Wellington New Zealand
4. Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences; University of East Anglia; Norwich UK
5. Institute of Arctic and Alpine Research; University of Colorado Boulder; Boulder Colorado USA
6. Cooperative Institute for Research in Environmental Sciences; University of Colorado Boulder; Boulder Colorado USA
7. Laboratoire des Sciences du Climat et de l'Environnement; Gif-sur-Yvette France
8. Department of Chemistry; University of Cambridge; Cambridge UK
9. National Centre for Atmospheric Science; Cambridge UK
10. School of Geography; University of Leeds; Leeds UK
11. Environment Canada; Downsview Ontario Canada
12. South African Weather Service; Stellenbosch South Africa
13. School of Physical and Chemical Sciences; North-West University; Potchefstroom South Africa
14. Department of Earth Sciences; University of Cambridge; Cambridge UK
15. School of Geographical Sciences; University of Bristol; Bristol UK