V. L. is supported by the National Science Foundation (NSF) under Grant ATM-0213248. D.W.J.T. is supported by NSF under Grants CAREER: ATM-0132190 and ATM-0320959. D.L.H. is supported by NSF under Grant ATM-9873691 from the Climate Dynamics Program. The authors thank two anonymous reviewers and the editor, Dr. Martin P. Hoerling, for comments that significantly improved the manuscript. Computational assistance by Mr. Kumar Jeev is also appreciated.
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