1. Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80523, United States
2. Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
3. Atmospheric and Environmental Research, Inc., Lexington, Massachusetts 02421, United States
4. Dept. of Chemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States
5. Aerodyne Research Inc., Billerica, Massachusetts 01821, United States
6. Dept. Atmospheric and Oceanic Sciences Department and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States