1. Physics Department; University of Maryland Baltimore County; Baltimore Maryland USA
2. Cooperative Institute for Meteorological Satellite Studies; University of Wisconsin; Madison Wisconsin USA
3. Department of Chemistry; University of Montana; Missoula Montana USA
4. Department of Meteorology; University of Maryland; College Park Maryland USA
5. Cloud and Aerosol Research Group, Department of Atmospheric Sciences; University of Washington; Seattle Washington USA
6. Joint Center for Earth Systems Technology; University of Maryland Baltimore County; Baltimore Maryland USA
7. Climate Monitoring and Diagnostics Laboratory; National Oceanic and Atmospheric Administration (NOAA); Boulder Colorado USA
8. Climatology Research Group; University of Witswatersrand; Johannesburg South Africa
9. Department of Environmental Sciences; University of Virginia; Charlottesville Virginia USA