We thank Dr. Michael Black, Dr. Mark DeMaria, Dr. Michael Montgomery, Jill Schaefer, Dr. Yuqing Wang, and Dr. Hugh Willoughby for their comments and suggestions. Rick Taft provided dedicated support with the nondivergent barotropic model and helped set up initial conditions for some of the experiments. Comments from two anonymous reviewers also greatly improved the quality of this manuscript. CR, WS, and BM were supported by NASA/CAMEX Grant NAG5-11010 and NASA Grant TCSP/04-0007-0031. JK was supported by NSF Grant ATM-0435694.
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