1. Department of Chemical and Biochemical Engineering, Center for Global and Regional Environmental Studies, and Informatics Initiative; University of Iowa; Iowa City Iowa USA
2. Atmospheric Chemistry and Dynamics Laboratory; NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. Climate and Radiation Laboratory; NASA Goddard Space Flight Center; Greenbelt Maryland USA
4. Marine Meteorology Division; Naval Research Laboratory; Monterey California USA
5. Cooperative Institute for Research in the Atmosphere; Colorado State University; Fort Collins Colorado USA