1. Department of Chemistry and Biochemistry, University of Montana, Missoula, MT, USA
2. Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN, USA
3. Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
4. Department of Chemistry, Colorado State University, Fort Collins, CO, USA
5. Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany
6. Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
7. Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA
8. Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA