1. Atmospheric Science Department; Colorado State University; Fort Collins Colorado USA
2. Earth System Research Laboratory; NOAA; Boulder Colorado USA
3. Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
4. School of Earth, Atmospheric and Environmental Sciences; University of Manchester; Manchester UK
5. Department of Chemistry and Biochemistry; University of Colorado; Boulder Colorado USA
6. Department of Atmospheric and Oceanic Sciences; University of Colorado; Boulder Colorado USA
7. Schools of Earth and Atmospheric Sciences and Chemical and Biomolecular Engineering; Georgia Institute of Technology; Atlanta Georgia USA