1. Chemical Sciences Division; NOAA Earth System Research Laboratory; Boulder Colorado USA
2. Cooperative Institute for Research in Environmental Sciences; University of Colorado Boulder; Boulder Colorado USA
3. Department of Chemistry and Chemical Biology; Harvard University; Cambridge Massachusetts USA
4. IEK-7, Forschungszentrum Jülich GmbH; Jülich Germany
5. Deceased 3 March 2012
6. Global Monitoring Division; NOAA Earth System Research Laboratory; Boulder Colorado USA
7. GRUAN/Deutscher Wetterdienst; Lindenberg Germany
8. NASA Langley Research Center; Hampton Virginia USA
9. NASA Ames Research Center; Moffett Field California USA
10. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA