Brian C Mcdonald¹, Colby Francoeur², Barbara K Dix³, Joost de Gouw⁴, Meng Li⁵, Jeff Peischl⁶, Jessica Gilman⁷, Carsten Warneke⁸, Pieternel Levelt⁹, Henk Eskes¹⁰, Pepijn Veefkind¹⁰, Thomas B Ryerson¹¹, Gregory J Frost⁵ and Michael Trainer⁵, (1)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (2)University of Colorado, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (3)Univ. of Colorado, Boulder, Boulder, CO, United States, (4)Cooperative Institute for Research in Environmental Sciences, Boulder, United States, (5)Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, United States, (6)NOAA Chemical Sciences Division, Boulder, CO, United States, (7)NOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, United States, (8)NOAA Chemical Sciences Div., Boulder, CO, United States, (9)Delft University of Technology, Delft, Netherlands, (10)Royal Netherlands Meteorological Institute, De Bilt, Netherlands, (11)NOAA ESRL Chemical Sciences Division, Boulder, CO, United States