The authors would like to acknowledge valuable discussions with and suggestions by Drs. S. J. Jacobs, K. G. Powell, and A. D. Richmond. Reviews and comments by Dr. O. Andreassen and two other anonymous reviewers are gratefully acknowledged. This research is supported by National Aeronautics and Space Administration through Contract NAS 5-27751. H.-L. Liu was supported in part by NASA Grants S-67018-F and S-97239-E to NCAR during the revision of this manuscript.
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