The authors gratefully acknowledge Phil Richardson for early work on the float trajectories over the MAR and Heather Furey for assistance in the final preparation of this manuscript. Thoughtful comments from two reviewers helped to clarify several points in the manuscript. This research was supported by National Science Foundation Grants OCE-9531877 to the Woods Hole Oceanographic Institution (WHOI) and OCE-9906775 to the University of Rhode Island, by the WHOI Summer Student Fellowship Program, and by the Lawrence J. Pratt and Melinda M. Hall Endowed Fund for Interdisciplinary Research at the Woods Hole Oceanographic Institution.
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