1. National Center for Atmospheric Research Boulder Colorado USA
2. Now at National Oceanic and Atmospheric Administration, Earth Systems Research Laboratory and Cooperative Institute for Research in Environmental Studies, University of Colorado, Boulder, Colorado, USA.
3. Department of Environmental and Occupational Health University of South Florida Tampa Florida USA
4. Department of Atmospheric and Oceanic Science University of Maryland College Park Maryland USA
5. Now at Laboratory for Atmospheres, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
6. Now at Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.