JCHC thanks Alexey Kaplan for his advice and his encouragement of this work. Mark Cane gave valuable comments and advice on an earlier version of this paper. We also thank Richard Seager, Yochanan Kushnir, Mike Evans, Martin Visbeck, and two anonymous reviewers for useful comments and suggestions. The input of Alan Betts, Patrick Minnis, and Steve Esbensen is gratefully acknowledged for deriving the PBL height from low cloud-top temperatures. This work is supported by a NASA Earth Systems Science Fellowship (to JCHC), and NSF Grant ATM 92-24915 (to SEZ). This is Lamont-Doherty Earth Observatory Contribution Number 5967.
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