The authors would like to thank C. Molling and R. Doherty for technical assistance with the simulations and data processing. Comments from M. Coe and two anonymous reviewers substantially improved the manuscript. This work was supported by NSF Grant ATM-9711484 and NASA Grant NAG5-3513. The computer simulations were, in part, conducted at the NCAR Climate Simulation Laboratory Computing Grant 93300185. The National Center for Atmospheric Research (NCAR) is sponsored by the National Science Foundation (NSF).
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