1. Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, USA
2. NASA Langley Research Center, Hampton, VA, USA
3. Science Systems and Applications, Inc., Hampton, VA, USA
4. Institute for Atmospheric Physics, DLR, German Aerospace Center, Oberpfaffenhofen, Germany
5. Institute for Atmospheric Physics, University of Mainz, Mainz, Germany
6. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, USA