1. National Centre for Atmospheric Science Leeds UK
2. School of Earth and Environment University of Leeds Leeds UK
3. Global Systems Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
4. Physical Sciences Laboratory National Oceanic and Atmospheric Administration Boulder CO USA
5. NorthWest Research Associates Redmond WA USA
6. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder CO USA
7. Department of Civil and Environmental Engineering Laboratory for Atmospheric Research Washington State University Pullman WA USA