Sabine Robrecht¹, Baerbel Vogel¹, Simone Tilmes², Karen Hepler Rosenlof³, Jens-Uwe Grooss¹, Andrew W Rollins⁴, Troy D Thornberry³, Martina Kraemer¹, Lance Christensen⁵ and Rolf Mueller¹, (1)Forschungszentrum Juelich, Juelich, Germany, (2)National Center for Atmospheric Research, Atmospheric Chemistry, Observations, and Modeling Laboratory, Boulder, CO, United States, (3)NOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, United States, (4)NOAA Earth System Research Lab, Boulder, CO, United States, (5)NASA Jet Propulsion Laboratory, Pasadena, CA, United States