Mark Leonard^1,2, Lori Bruhwiler³, John P Dunne⁴, Elena Shevliakova⁵, Katherine D Haynes⁶, Ian T Baker⁶, A Scott Denning⁶ and Edward J Dlugokencky⁷, (1)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (2)NOAA; ESRL GMD, Boulder, CO, United States, (3)NOAA, ESRL/GMD, Boulder, CO, United States, (4)NOAA Geophys Fluid Dynamic, Princeton, United States, (5)Princeton Environmental Institute, Princeton, NJ, United States, (6)Colorado State University, Atmospheric Sciences, Fort Collins, CO, United States, (7)NOAA/ESRL Global Monitoring Division, Boulder, CO, United States