1. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
2. Institute of Environmental Physics, University of Heidelberg, D-69120 Heidelberg, Germany
3. Department of Chemistry and Biochemistry and Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska 99775, United States
4. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91125, United States
5. Department of Chemistry, Department of Earth, Planetary, and Atmospheric Sciences, and Purdue Climate Change Research Center, Purdue University, West Lafayette, Indiana 47907, United States
6. School of Aviation and Transportation Technology, Purdue University, West Lafayette, Indiana 47907, United States
7. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States