This study was performed during the periodical work of SKG at IFM (Kiel) in 1994 and 1995. He thanks IFM for its hospitality. Special thanks to Dr. J. Kielmann for his support of our work on the IFM computer cluster. Individual COADS data were made available by courtesy of Steve Worley of NCAR (Boulder). During this work we had extremely helpful discussions with Fred Dobson and Stuart Smith of BIO (Dartmouth), Neil Hogben of BMT, Ltd. (Teddington), and Andreas Sterl and Nanne Weber of KNMI (de Bilt). The suggestions and criticism of three anonymous reviewers are greatly appreciated. Great thanks to Anne Meyer, who helped us very much by doing her excellent and important everyday job. This study was supported by Deutsche Forschungsgemeinschaft, Sonderforschungsbereich SFB 133.
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