1. Department of Atmospheric Science, University of Utah, Salt Lake City, Utah, USA;
2. Storm Peak Laboratory Division of Atmospheric Science, Desert Research Institute, Steamboat Springs, Colorado, USA;
3. ESRL Global Monitoring Division (GMD), Earth System Research Laboratory National Oceanic and Atmospheric Administration, Boulder, Colorado, USA;
4. ESRL Global Monitoring Division (GMD), Cooperative Institute for Research in Environmental Sciences University of Colorado, Boulder, Colorado, USA;
5. Division of Atmospheric Science, Desert Research Institute, Reno, Nevada, USA;
6. Enertechnix Inc, Olympia, Washington, USA;
7. Rocky Mountain Center for Occupational and Environmental Health, School of Medicine, University of Utah, Salt Lake City, Utah, USA;
8. Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA