1. John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts USA
2. Center for Global and Regional Environmental Research University of Iowa Iowa City Iowa USA
3. Department of Chemical and Biochemical Engineering University of Iowa Iowa City Iowa USA
4. Department of Physics and Atmospheric Science Dalhousie University Halifax Nova Scotia Canada
5. Department of Civil and Environmental Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
6. Desert Research Institute Reno Nevada USA
7. Atmospheric Science and Technology Directorate, Climate Research Division Environment and Climate Change Canada Toronto Ontario Canada
8. Atmospheric Sciences Research Center State University of New York at Albany Albany New York USA
9. Environmental Radioactivity Laboratory INRaSTES, NCSR Demokritos Athens Greece
10. Arctic Research Center, Department of Environmental Science Aarhus University Roskilde Denmark
11. Center for Air Resources Engineering and Science Clarkson University Potsdam New York USA