I am very much indebted to J. Shukla, Tapio Schneider, Michael Tippett, and Ben Kirtman for instructive discussions. Comments from Tapio Schneider, acting as reviewer, and two other reviewers also led to improvements in this paper. Discussions with Lenny Smith also led to helpful clarifications. This research was supported by the NSF (ATM9814295), NOAA (NA96-GP0056), and NASA (NAG5-8202).
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