Comments by George Kiladis and two referees are appreciated. The following fellowships contributed to this cooperation: Max-Planck Prize (K.F.), Fulbright (W.F.), and Humboldt (J.McB.). William Frank’s COARE research was under NSF Grant ATM-911 59050, ONR Grant N00014-92J-1069, and the American–Australian Education Foundation. R. Wang was supported by a BMFT (Germany) Climate Research Grant.
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