1. Department
of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
2. Harvard-Smithsonian
Center for Astrophysics, Cambridge, Massachusetts 02138, United States
3. Department
of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California 90095, United States
4. Department
of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China
5. Nicholas
School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708, United States
6. Decision
and Information Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
7. Agriculture and
Agri-Food Canada, Agassiz, British Columbia V0M 1A2, Canada
8. Environment
Canada, Gatineau, Quebec K1A 0H3, Canada