1. Norwegian Institute for Air Research; Kjeller Norway
2. Chinese Academy of Meteorological Sciences; Beijing China
3. Global Monitoring Division; National Oceanic and Atmospheric Administration; Boulder Colorado USA
4. Japan Meteorological Agency; Tokyo Japan
5. National Institute for Environmental Studies; Tsukuba Japan
6. National Institute of Environmental Research; Incheon South Korea
7. Korea Meteorological Administration; Seoul South Korea
8. Department of Earth Sciences; Royal Holloway University of London; London UK
9. Scripps Institution of Oceanography; University of California, San Diego; La Jolla California USA
10. Massachusetts Institute of Technology; Cambridge Massachusetts USA
11. Atmospheric Chemistry Research Group; School of Chemistry, University of Bristol; Bristol UK
12. Institute of Arctic and Alpine Research; University of Colorado; Boulder Colorado USA