We thank Richard Johnson, Paul Ciesielski, and Qiang Fu for their suggestions regarding the heating profiles used in this study. We also thank Dennis Hartmann for his advice and comments. Three anonymous reviewers provided insightful comments that helped strengthen this paper. Candace Gudmundson edited the manuscript and Kay Dewar and Jill Campbell refined the figures. This research was supported by the following grants: NASA NAG5-9668, the Earth System Science fellowship NGT5-30378, NSF ATM-9873691, and the University of Washington JISAO Cooperative Agreement NA67RJ0155 (PACS).
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