Extended Data Figure 3: Cross-transect velocity and relative vorticity along the main outflow from the PIIS calving front.
From: Vigorous lateral export of the meltwater outflow from beneath an Antarctic ice shelf
a, Cross-transect velocity (v, colour scale) along transect S2, with positive values directed northeastward. Potential temperature contours are shown at intervals of 0.2 °C (see Fig. 3a). b, Ratio of relative vorticity ζ to planetary vorticity f along the same transect (colour scale), where 
. Areas of positive potential vorticity (indicative of overturning instabilities) are outlined as in Fig. 3e. The outline shading denotes the instability type (GRV, gravitational; SYM, symmetric; CTF, centrifugal; see Methods). The characteristic vertical extent of the PIIS is shown by the grey rectangle at the right-hand axis of each panel.
