Robert Pincus¹, Katherine Marvel², Masa Kageyama³, Allegra N. LeGrande⁴, Brian Medeiros⁵, Ron L Miller⁶, Gavin A Schmidt⁶ and Fiona O'Connor⁷, (1)University of Colorado at Boulder, Boulder, CO, United States, (2)NASA Goddard Institute for Space Studies, New York, United States, (3)LSCE Laboratoire des Sciences du Climat et de l'Environnement, Gif-Sur-Yvette Cedex, France, (4)NASA GISS 568, New York, NY, United States, (5)National Center for Atmospheric Research, Climate and Global Dynamics Laboratory, Boulder, CO, United States, (6)NASA/GISS, New York, NY, United States, (7)Met Office Hadley Centre, Exeter, United Kingdom