Panel A: The green shading and dashed contours indicate southward velocities, the medium blue denotes northward velocities less than 50 cm/s, and the light blue denotes northward velocities greater than 50 cm/s. Contour level is 10 cm/s. Red circles on lower axis indicate CTD sites. Gray shading indicates the ocean bottom. Panel B: The error bars indicate the accuracy of the absolute reference velocity. Green shading indicates southward velocity, blue indicates northward.