1. Department of Earth SciencesRoyal Holloway, University of London Egham Surrey UK
2. Climate Change Research Institute, School of Geography Environment and Earth SciencesVictoria University of Wellington Wellington New Zealand
3. Earth System Research Laboratory, Global Monitoring DivisionUS National Oceanic and Atmospheric Administration Boulder CO USA
4. Institute of Arctic and Alpine ResearchUniversity of Colorado Boulder CO USA
5. NILU‐Norwegian Institute for Air Research Kjeller Norway
6. Centre for Atmospheric ScienceUniversity of Manchester Manchester UK
7. Laboratoire des Sciences du Climat et de l'Environnement Gif‐sur‐Yvette Cedex France
8. Energy and Sustainability Research InstituteUniversity of Groningen Groningen Netherlands
9. Environmental Change Institute, School of Geography and the EnvironmentUniversity of Oxford Oxford UK
10. Oxford Martin SchoolUniversity of Oxford Oxford UK
11. British Antarctic Survey Cambridge Cambs. UK
12. Lancaster Environment CentreLancaster University Lancaster UK
13. Institut für UmweltphysikHeidelberg University Heidelberg Germany
14. Centre for Ocean and Atmospheric Sciences, School of Environmental SciencesUniversity of East Anglia Norwich Norfolk UK
15. CICERO Centre for International Climate Research Oslo Norway
16. National Centre for Atmospheric Science, and Department of ChemistryUniversity of Cambridge Cambridge UK