Emily V Fischer¹, Frank M Flocke², Joel A Thornton³, Lu Hu⁴, Jakob Lindaas⁵, Wade Permar⁶, Teresa Lynn Campos⁷, Andrew John Weinheimer⁸, Denise Montzka⁹, Geoffrey S Tyndall⁷, Qiaoyun Peng¹⁰, Brett B. Palm³, Julieta Juncosa¹¹, Eric C Apel⁹, Rebecca S Hornbrook⁹, Samuel R Hall¹², Kirk Ullmann⁹ and Stephen Shertz⁹, (1)Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO, United States, (2)NCAR, Boulder, CO, United States, (3)University of Washington, Seattle, WA, United States, (4)Univ of MN-Soil, Water, & Clim, St. Paul, MN, United States, (5)Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States, (6)University of Montana, Department of Chemistry and Biochemistry, Missoula, MT, United States, (7)Natl Ctr Atmospheric Research, Boulder, CO, United States, (8)NCAR, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, CO, United States, (9)National Center for Atmospheric Research, Boulder, CO, United States, (10)California State University Northridge, Department of Environmental and Occupational Health, Northridge, CA, United States, (11)Colorado State University, Atmospheric Science, Fort Collins, United States, (12)NCAR, Denver, CO, United States