Eric A Ray¹, Robert W Portmann², Pengfei Yu³, John S Daniel⁴, Stephen A Montzka⁵, Geoffrey S Dutton⁶, Brad David Hall⁴, Fred L Moore⁷ and Karen Hepler Rosenlof⁸, (1)Cooperative Institute for Research in Environmental Sciences, NOAA Chemical Sciences Division, Boulder, CO, United States, (2)Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, United States, (3)CIRES, Boulder, CO, United States, (4)NOAA Boulder, Boulder, CO, United States, (5)NOAA/ESRL Global Monitoring Division, Boulder, CO, United States, (6)NOAA/ESRL GMD, Boulder, CO, United States, (7)NOAA, Boulder, CO, United States, (8)NOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, United States