1. Institute for Climate and Atmospheric Science, School of Earth and Environment; University of Leeds; Leeds UK
2. Atmospheric Chemistry and Dynamics Laboratory; NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. GESTAR; Universities Space Research Association; Columbia Maryland USA
4. NIWA; Lauder New Zealand
5. Department of Chemistry; University of Cambridge; Cambridge UK
6. IPSL; Paris France
7. Department of Physical and Chemical Sciences; University of L'Aquila; L'Aquila Italy
8. Science Systems and Applications, Inc.; Lanham Maryland USA
9. Met Office Hadley Centre; Exeter UK
10. National Center for Atmospheric Research; Boulder Colorado USA
11. Physical-Meteorological Observatory/World Radiation Center; Davos Switzerland
12. Institute for Atmospheric and Climate Science; ETH Zurich; Zurich Switzerland