We are grateful to Steve Worley for assisting us with the COADS dataset, Gregg Walters for his help with the GTS station dataset, and Dennis Shea for computer assistance. We thank Kevin Trenberth for his constructive comments, Clara Deser for suggesting the zonal shift of the marine pressure data, and Roland Madden for reading an earlier version of the manuscript. We also thank the three anonymous reviewers for their careful reading of the manuscript and many constructive comments, which resulted in the addition of Table 1 and Fig. 11. Dai was supported by a NOAA Postdoctoral Program in Climate and Global Change fellowship, administered by the University Corporation for Atmospheric Research. J. Wang is supported by National Science Foundation Grant ATM-9223150.
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