We thank Greg Johnson and Shang-Ping Xie for helpful discussions and comments on the manuscript. The research presented in this paper was supported by Contracts 957580 and 959351 from the Jet Propulsion Laboratory funded under the NSCAT Announcement of Opportunity, NASA Grant NAS5-32965 for funding of Ocean Vector Winds Science Team activities, NOAA Grant NA96GP0368 from the Office of Global Programs, NASA TRMM Contract NAS5-9919, NASA’s Earth Science Information Partnership through Contract SUB1998-101 from the University of Alabama in Huntsville and NOAA’s Office of Oceanic and Atmospheric Research.
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