1. Dalhousie University, Halifax Nova Scotia, Canada. B3H 3J5
2. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, 02138,
United States
3. Universities
Space Research Association,
Columbia, Maryland 21044, United States
4. Atmospheric Chemistry and Dynamics
Laboratory, Earth Sciences Division, NASA Goddard Space Flight Center, Maryland 20771, United States
5. University of British Columbia, Vancouver, British Columbia, Canada. V6T 1Z3
6. Air Quality Processes Research
Section, Environment Canada, Toronto, Ontario,
Canada.M6B 2S7