We would like to thank D. L. Hartmann, W. Randel, H. Nakamura, E. DeWeaver, and two reviewers (D. J. Karoly and J. W. Kidson) for their helpful comments and suggestions. Thanks also to D. Battisti, G. Bjarnason, P. Boynton, A. J. Broccoli, V. Dymnikov, P. Goodman, J. R. Holton, N.-C. Lau, P. Rhines, M. Serreze, D. Stephenson, and S.-P. Xie for insightful suggestions at various stages of this research. Two of the authors (DWJT and JMW) are supported by the National Science Foundation under Grant ATM-9805886. GCH was supported by the Alexander von Humboldt foundation and the National Science Foundation under Grant ATM-9707069.
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