Pamela Rickly, NOAA ESRL Chemical Sciences Division, Boulder, CO, United States; University of Colorado at Boulder, CIRES, Boulder, CO, United States, Andrew W Rollins, NOAA Earth System Research Lab, Boulder, CO, United States, Lu Xu, California Institute of Technology, Pasadena, United States, John D Crounse, California Institute of Technology - CalTech, Pasadena, CA, United States and Paul O Wennberg, California Institute of Technology, Pasadena, CA, United States