We thank Dr. A. J. Miller of the Climate Prediction Center at NCEP, and Dr. Paul A. Newman of the Atmospheric Chemistry and Dynamics Branch (code 916) at NASA GSFC for producing these data. We also thank the Goddard DAAC for distributing the data as part of NASA's Mission to Planet Earth program. We thank Paul Newman, Larry Coy, and Eric Nash for providing assistance and easy access to the data, and Alan Plumb for useful suggestions, and for his excellent Middle Atmosphere class notes. The reviewer's comments were very helpful in improving the manuscript. NH thanks Gerard Roe and Constantine Giannitsis for helpful discussions. This research was supported by Grants ATM9813795 from the National Science Foundation, and NAG5-5147 from National Aeronautics and Space Administration, and DEFG02-93ER61673 from the Department of Energy.
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