This research was supported by the National Aeronautics and Space Administration through Grant NAG5-6207. I would like to thank Drs. Sukyoung Lee, Klaus Weickmann, and Harry Hendon for their very beneficial comments on this paper, and Dr. Hyun-kyung Kim for providing me with the computer code for inverting the omega equation. Lastly, I would also like to thank the NOAA Climate Diagnostics Center for providing me with the NCEP–NCAR reanalysis dataset, and Dr. Peter Nelson of Atmospheric and Environmental Research, Inc., for providing me with the LOD time series.
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