This research was carried out with the support of the Office of Naval Research Grant N00014-90-J-1481. We thank Wen Qian for producing the OTIS-3 runs for the case study periods of the DAMEE GSR program. We thank the Harvard University Gulfcast group for providing the software giving us the framework for the Gulf Stream axis analysis algorithms used in this paper. We also thank G. R. Flierl for helping us gather the Hall and Fofonoff cruise data into a usable form through the software he developed as a part of the JGOFS data management program.
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