Comments and suggestions from D. Battisti have greatly improved this manuscript. This work has also benefitted from discussions with E. Schneider, J. Shukla, J. Kinter, M. Cane, P. Schopf, M. Suarez, D. Straus, B. Wang, and M. Davey. L. Kikas assisted in archiving data. This work was supported by National Oceanic and Atmospheric Administration Grants NA26-GP0149 and NA46-GP0217 and National Science Foundation Grant ATM-93021354.
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