Nicholas M Geyer, Colorado State University, Atmospheric Sciences, Fort Collins, CO, United States, A Scott Denning, Colorado State University, Department of Atmospheric Science, Fort Collins, CO, United States, Mark Branson, Colorado State University, Fort Collins, CO, United States, Andrew E Schuh, Colorado State University, CIRA, Fort Collins, CO, United States and Andrew R Jacobson, NOAA Boulder, Boulder, CO, United States