1. School of Science, Technology, Engineering, and Mathematics, Physical Sciences Division, University of Washington, Bothell, Washington 98011, United States
2. Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States
3. Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80307, United States
4. Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado 80309, United States
5. Department of Physics, University of Helsinki, Helsinki FI-00014, Finland