We are grateful to Bjorn Stevens for providing us with his large-eddy simulation and to Laura Hinkelman for getting us going. We appreciate very helpful comments made by Alexander Marshak and Viktor Venema. This research was supported by the Office of Science (BER), U.S. Department of Energy Grant DE-FG02-03ER63561 and Interagency Agreement DE-AI02-95ER61961.
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