Author(s): Stephen Montzka, NOAA Boulder (First Author, Presenting Author) Geoffrey Dutton, Cooperative Institute for Research in Environmental Sciences Martyn Chipperfield, University of Leeds Sean Davis, Chemical Sciences Division, NOAA Earth System Research Laboratory; Cooperative Institute for Research in Environmental Sciences Zihao Wang, University of Leeds Helen Walter-Terrinoni, Air-Conditioning, Heating, and Refrigeration Institute Isaac Vimont, NOAA Boulder Lei Hu, NOAA Boulder Scott Clingan, Cooperative Institute for Research in Environmental Sciences (CIRES), NOAA/GML Molly Crotwell, Cooperative Institute for Research in Environmental Sciences Brad Hall, Retired Robert Portmann, Retired