This work was supported by the National Science Foundation through Grant OCE 97-29765. The ocean color data were provided by the SeaWiFS Project at Goddard Space Flight Center. The data were obtained from the Goddard Distributed Active Archive Center under the auspices of the National Aeronautics and Space Administration. Use of this data is in accord with the SeaWiFS Research Data Use Terms and Conditions Agreement. Supplemental support for the surface drifter measurements was provided by the National Oceanic and Atmospheric Administration. The in situ observations reported here result from the collaborative data collection and analysis efforts of the North Brazil Current Rings Experiment coinvestigators (P. L. Richardson, D. M. Fratantoni, W. E. Johns, S. Garzoli, W. D. Wilson, and G. J. Goni). We acknowledge the thoughtful comments made by P. L. Richardson and W. E. Johns on an early version of this manuscript. We thank Semyon Grodsky and an anonymous reviewer for their insightful comments and suggestions for improvement.
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