We thank the crews and technicians on the R/V Thomas G. Thompson and the RRS James Cook. Invaluable assistance with the work was provided by A. Bogdanoff, P. Courtois, K. Decoteau, R. Krishfield, S. Lambert, K. Sheen, and others. R. Ferrari, E. Kunze, and M. Nikurashin provided valuable comments on the draft material for the manuscript. This work was supported by the U.S. National Science Foundation and by the Natural Environment Research Council of the United Kingdom.
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