We acknowledge support from the National Science Foundation Office of Polar Programs (Grant OPP-9816226/-0338103) and the Division of Ocean Sciences (Grant OCE-0327544). Janet Sprintall generously provided the temperatures and geostrophic shear estimates from the Drake Passage XBT data. We are also grateful to the captain and crew of the ARSV Laurence M. Gould and to Raytheon Polar Services Corporation for their excellent technical and logistical support on the cruises. Eric Firing, Jules Hummon, and Sharon Escher have been invaluable for their contribution to the ADCP data collection, processing, and editing. Conversations with Janet Sprintall, Sarah Gille, Shane Elipot, Jeff Polton, Gordon Stephenson, and Paola Cessi have provided much insight into the problem.
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