This research was supported by the Office of Science (BER), U.S. Department of Energy (Grant DE-FG02-03ER63561), and by the National Science Foundation (Grant ATM-0336702) as part of the Climate Processes Team on Low-Latitude Cloud Feedbacks on Climate Sensitivity. The Geophysical Fluid Dynamics Laboratory supported an extended visit by R. Pincus. The contribution of S. A. Klein was performed under the auspices of the U.S. Department of Energy at the University of California Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. We appreciate the comments of Xianglei Huang, Isaac Held, and two anonymous reviewers.
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