Figure 12 . Tracer gradient control of CDW diffusion. Isopycnal diffusivity (top), mixing length (middle), and topographic gradient (bottom) over the 1000–3000 m isobath are regressed onto the inversed tracer gradient as spiciness (left) and thickness (right). Scatters correspond to each grid point, colored by mean flow speed. Horizontal and vertical axes are normalized by the averages.