The authors thank Helen Hill for a great deal of help with the figures and analysis, Chris Hughes for use of his altimetric phase speed analysis, Nikolai Maximenko for use of his surface drifter data, and Geoff Vallis for discussions and advice. JM acknowledges the support of the Polar Programs Division of NSF; KSS acknowledges the support of NSF Grant OCE0327470. Both authors acknowledge the support of the GFD program, sponsored by NSF OCE.
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