Support for this study was provided also by NSF Grant ATM-9627890 and NASA Grant NAG 5-2491. This is Journal Page No. J-17310 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, Project No. 3245,3153 and supported by Hatch Act and State of Iowa Funds. Data and computer support used in this study were partly provided by the National Center for Atmospheric Research sponsored by NSF.
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