Rebecca R Buchholz¹, Helen Marie Worden¹, Mijeong Park¹, Merritt N Deeter¹, David P Edwards¹, Gene Francis¹, Benjamin Gaubert¹, Sara Martinez-Alonso¹, Wenfu Tang¹, Mian Chin² and Robert C Levy², (1)National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling Laboratory, Boulder, CO, United States, (2)NASA Goddard Space Flight Center, Greenbelt, MD, United States