We thank Dorian Abbot, Richard Lindzen, Edwin Schneider, Adam Sobel, and an anonymous reviewer for very helpful comments on an earlier version of this paper. We are grateful for financial support by the Davidow Discovery Fund, by an Alfred P. Sloan Research Fellowship, and by the National Science Foundation (Grant ATM-0450059) and for computing resources provided by the National Center for Atmospheric Research (which is sponsored by the National Science Foundation). The program code for the simulations described in this paper, as well as the simulation results themselves, are available from the authors upon request.
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