We appreciate extensive discussions with David Rind and Minghua Zhang. Special thanks go to Linjuan Gong for her persistent efforts in processing the simulation data. This research was supported by Grants NASA NAGW-2718 (DHB) and NSF OPP-9414276 (DL). The research of Wan-Ho Lee andRichard C. J. Somerville has been supported in part by Grants NSF ATM-9114109, NASA NAG5-236, and NAG5-2238, NOAA NA90AA-D-CP526, DOE-ARM DE-FG03-90ER61061, and Digital Equipment Corporation 1243, as well as the University of California Institutional Collaborative Research Program. The computations were mostly performed on the CRAY Y-MP of NCAR and in part on the CRAY Y-MP of the Ohio Supercomputer Center.
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