1. Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523–1371, USA;
2. Canadian Center for Climate Modeling and Analysis, Atmospheric Environment Service, University of Victoria, Victoria, B.C., Canada V8W 2Y2;
3. Max-Planck-Institut für Meteorologie, Bundesstrasse 55, D-2000 Hamburg 13, Germany;
4. CRC for Southern Hemisphere Meteorology, Monash University, Clayton, Victoria 3168, Australia;
5. NASA Goddard Institute for Space Studies, New York, NY, USA;
6. Center for Atmospheric Sciences, McCone Hall, University of California, Berkeley, CA, USA;
7. Atmospheric and Oceanic Sciences, Sayre Hall, Princeton University, Princeton, NJ, USA;
8. National Institute for Resources and Environment, 16-3, Onagawa Tsukuba, Ibaraki, Japan;
9. Centre des Faibles Radioactivites, LMCE, Gif-sur-Yvette, Saclay, France;
10. Centre for Resource and Environmental Studies, Australia National University, Canberra, ACT 0200, Australia;
11. Max-Planck-Institute for Chemistry, Air Chemistry Division, Mainz, Germany;
12. Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany