This work was supported in part by the National Science Foundation, under Grants ATM-9422525 and ATM-9529295, and by the Office of Naval Research under Grant ONR-N00014-93-1-0456. We also acknowledge the hospitality and support provided by the Isaac Newton Institute for Mathematical Sciences during the 1996 Program in The Mathematics of Atmosphere and Ocean Dynamics, where we benefited greatly from discussions with Chuck Leith, Rick Salmon, and Phil Morrison. We would also like to express our thanks to Paul Reasor and Mark Hidalgo for their assistance with the stability analysis of continuous profiles, and to Lloyd Shapiro and to an anonymous reviewer for their helpful comments.
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