This research was supported by National Science Foundation Grant ATM-9310119 and partially from the Naval Research Laboratory Basic Research Program PE601153N. We would like to express our gratitude to Dr. R. V. Madala and K. Seshegyi for helpful discussions during this research and to Dr. C. Long for his help in computing. We would like to express our sincere thanks also to Scott Applequist, Mike Kirby, and Kevin Convery for their help in the graphics preparation. Computer time for the numerical integrations was furnished by the National Center for Atmospheric Research (NCAR), which is supported by the National Science Foundation. We wish to express our sincere appreciation to Mr. Ken Hansen of NCAR for his assistance in using the CRAY Y-MP 8/864 and J916 16/256. The first author would like to express his gratitude to Dr. D. Loper, director of the Geophysical Fluid Dynamics Institute, and Dr. A. Krothapalli, chairman, Department of Mechanical Engineering, for their support. Finally, we are grateful to the reviewers whose insightful comments forced us to do additional calculations, the results of which greatly strengthened this paper.
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