1. Atmospheric Sciences Program Michigan Technological University Houghton Michigan USA
2. Department of Physics Michigan Technological University Houghton Michigan USA
3. Now at Pacific Northwest National Laboratory Richland Washington USA
4. Institute for Terrestrial and Planetary Atmospheres, School of Marine and Atmospheric Sciences Stony Brook University Stony Brook New York USA
5. Now at Laboratory of Environmental Chemistry Paul Scherrer Institute Villigen Switzerland
6. Department of Civil and Environmental Engineering Michigan Technological University Houghton Michigan USA
7. Department of Chemistry Michigan Technological University Houghton Michigan USA
8. Now at Department of Biotechnology University of Rijeka Rijeka Croatia
9. Now at US Environmental Protection Agency RTP North Carolina USA
10. Instituto de Investigação em Vulcanologia e Avaliação de Riscos da Universidade dos Açores Ponta Delgada Açores Portugal