1. CSIRO Marine and Atmospheric Research; Aspendale; Victoria; Australia
2. Laboratoire des Sciences du Climat et de l'Environnement; Gif-sur-Yvette; France
3. Department of Atmospheric Science; Colorado State University; Fort Collins; Colorado; USA
4. Climate Monitoring and Diagnostics Laboratory; National Oceanic and Atmospheric Administration; Boulder; Colorado; USA
5. Department of Earth, Atmospheric and Planetary Science; Massachusetts Institute of Technology; Cambridge; Massachusetts; USA
6. Center for Atmospheric Sciences; University of California; Berkeley; California; USA
7. Department of Biogeochemical Systems; Max-Planck-Institut fur Biogeochemie; Jena; Germany
8. Quality Assurance Section, Atmospheric Environment Division, Observations Department; Japan Meteorological Agency; Chiyoda-ku, Tokyo; Japan
9. Institute for Global Change Research, Frontier Research Center for Global Change; Japan Agency for Marine-Earth Science and Technology; Yokohama; Japan
10. Department of Earth System Science; University of California; Irvine; California; USA
11. Global Environment Study Group, Research Institute of Environmental Management Technology; National Institute of Advanced Industrial Science and Technology; Ibaraki; Japan
12. Goddard Space Flight Center; Greenbelt; Maryland; USA