This work was supported in part by grants from NSC87-2621-P-008-016 for GPS data processing, NSC87-NSPO(A)-PC-FA07-06 for the WVR experiment, and Center for Space and Remote Sensing Research. James Liljegren was supported by the Environmental Sciences Division of the U.S. Department of Energy as part of the Atmospheric Radiation Measurement Program under Contracts CHENG82-1010502-0002884 at Ames Laboratory and W-31-109-Eng-38 at Argonne National Laboratory. The authors thank Radiometrics Corporation for the loan of a WVR, CWB for providing GPS data from the Taipei site and a space to conduct the WVR experiment, NOAA Forecast Systems Lab for providing GPS data from the Lamont site, and Dr. R. Ware for technical advice. The authors also thank Dr. Ed R. Westwater and two anonymous reviewers for their useful comments about the original manuscript.
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