1. Atmospheric Sciences Program, Michigan Technological University, Houghton, Michigan 49931, United States
2. Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634, United States
3. Department of Physics and Astronomy, College of Charleston, Charleston, South Carolina 29424, United States
4. Atmospheric Sciences Program and Department of Physics, Michigan Technological University, Houghton, Michigan 49931, United States