We thank Eric Johnson for fruitful discussions relating to this work. Comments and suggestions from two anonymous reviewers were helpful in improving the manuscript. Special thanks to G. Mitchum who provided the gridded TOPEX/Poseidon altimetry data, R. Reynolds (NOAA) for the SST data, R. Atlas for the wind data, Greg Johnson for the gridded mean drifter data, and PMEL for the TAO data. The work was supported by NASA Grants NAG5-4867 and NAG5-6358.
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