This work was funded by the National Science Foundation (0424133). Yanwei Zhang was supported by the State Key Laboratory of Marine Geology and Program for Young Excellent Talents in Tongji University, as well as Open Fund of the Key Lab of Ocean Circulation and Waves from Chinese Academy of Sciences. Thanks to Mike Neeley-Brown and Ray Kreth for their technical assistance and to A. Perlin for computing help. Jonathan Nash and A. Perlin have made important contributions to this project. Comments by Emily Shroyer, Aurelie Moulin, and Uwe Stoeber on an early draft are appreciated. Constructive comments by three anonymous reviewers helped to improve this paper. The continued involvement of NOAA’s National Data Buoy Center through the TAO Project Office and by the Pacific Marine Environmental Laboratory has been critical to the success of this project.
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