Aparajeo Chattopadhyay, Cooperative Institute for Research in Environmental Sciences (CIRES), NOAA Boulder, ESRL/CSD, Boulder, CO, United States, Vassileios Papadimitriou, University of Crete, Department of Chemistry, Laboratory of photochemistry and chemical kinetics (LAPKIN), Heraklion, Greece, Tomasz Gierczak, NOAA Boulder, Boulder, United States, Paul Marshall, University of North Texas, Chemistry, Denton, TX, United States and James B Burkholder, NOAA Boulder, ESRL/CSD, Boulder, CO, United States