Figure 7 . Mixing length dependency on the mean flow. Upper and lower panels are based on spiciness and thickness, and left/right panels are for ASW/CDW, respectively. The results are separately shown for the three frontal zones: subpolar (south of SACCF-S), southern (from SACCF-S to SACCF-N), and antarctic (from SACCF-N to PF) zones. Standard errors due to the spatial variation are shaded.