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We thank C. Wunsch (MIT) for providing SSH fields and upper ocean current data. We thank D. Archer, M. Behrenfeld, K. Wyman, C. Flagg, D. Karl, C. King, T. Moisan, L. Medlin, D. Kolber, C. Koblinsky, J. Raven, D. Wallace, and C. Wirick for help, discussions, and comments. Supported by NASA and grants from the National Science Foundation to P.G.F. and R.T.B. Additional support for P.G.F. was provided by the U.S. Department of Energy and the Office of Naval Research. V.S. is supported by the German Government through the Ministry of Education and Research.
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