This research was supported by the Paleo Perspectives on Climate Change program of the National Science Foundation (Grant ATM0902735). The authors would like to extend their thanks to F. Zeng and J. Krasting for their help in conducting these simulations; B. Soden for use of the radiative kernels and CMIP3 calculations; D. Pollard for help with the calendar conversion; V. Ghate, J. Kay, and N. Barton for their cloud expertise; and the NOAA Geophysical Fluid Dynamics Laboratory at Princeton for use of their computing resources. Additionally, we thank two anonymous reviewers for their useful comments.
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