The authors thank Eric D’Asaro for enlightening discussions of the Labrador Sea and vertical velocities, as well as Eric Kunze, Nicholas Beaird, and Amanda Gray for helpful insights. RRH was supported ONR Grant N00014-08-1-0446. The Seaglider project was supported by NSF Grant OCE-0550584. EFW was supported by a National Science Foundation Graduate Research Fellowship for a part of this work.
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