1. Earth System Research Laboratory; NOAA; Boulder Colorado USA
2. Service d'Aéronomie du Centre Nationale de la Recherche Scientifique; Institut Pierre Simon Laplace/Université Pierre et Marie Curie; Paris France
3. Pacific Marine Environmental Laboratory; NOAA; Seattle Washington USA
4. Department of Environmental Science, Policy and Management; University of California; Berkeley California USA
5. Department of Civil and Environmental Engineering; Michigan Technological University; Houghton Michigan USA
6. Department of Chemistry; University of York; York UK
7. Science and Technology Branch; Environment Canada; Toronto, Ontario Canada
8. Institute for the Study of Earth, Oceans and Space; University of New Hampshire; Durham New Hampshire USA
9. NASA Ames Research Center; Moffett Field California USA
10. Deutsches Zentrum für Luft- und Raumfahrt; Oberpfaffenhofen, Wessling Germany
11. Departments of Environmental Science and Engineering and Chemical Engineering; California Institute of Technology; Pasadena California USA
12. Laboratoire d'Aérologie, Observatoire Midi-Pyrénées; UMR 5560, Centre Nationale de la Recherche Scientifique/Université Paul Sabatier; Toulouse France