Matthew Ryan Gentry, University of Colorado Boulder, Boulder, CO, United States, Jennifer E Kay, Univeristy of Colorado at Boulder, Boulder, CO, United States, Nicole S Lovenduski, University of Colorado, Department of Atmospheric and Oceanic Sciences, Boulder, CO, United States, Precious Precious Mongwe, Council for Scientific and Industrial Research, Oceanography, Cape Town, South Africa and David P Schneider, National Center for Atmospheric Research, Boulder, CO, United States