The authors would like to thank Steve Griffies, Suki Manabe, Ron Stouffer, Eli Tziperman, Andrew Weaver, and Mike Winton for very useful comments on an earlier version of this manuscript. Keith Dixon provided the results from his extended integration of the GFDL coupled model. RJG is grateful to the Canadian Institute for Climate Studies, the Atmospheric Environment Service of Environment Canada, and NSERC for research funding support.
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