1. Chemical Sciences Division; NOAA Earth Systems Research Laboratory; Boulder Colorado USA
2. Cooperative Institute for Research in Environmental Sciences; University of Colorado Boulder; Boulder Colorado USA
3. Global Monitoring Division; NOAA Earth Systems Research Laboratory; Boulder Colorado USA
4. Department of Atmospheric Sciences; Texas A&M University; College Station Texas USA
5. Jet Propulsion Laboratory/California Institute of Technology; Pasadena California USA
6. Institute for Atmospheric and Environmental Sciences; Goethe Universität Frankfurt; Frankfurt Germany
7. Institute of Earth Science; Miyagi University of Education; Sendai Japan
8. Center for Atmospheric and Oceanic Studies; Tohoku University; Sendai Japan