Ocean bottom topography (depths in km) of the extratropical Southern Hemisphere.
The southern boundary of the area of study (defined as locations remaining ice-free during at least 70% of the time) is marked with a dashed line. The magenta point to the SW of Tasmania shows the location of the SOFS buoy (see Methods). The locations of the profiles (A–F), discussed in the text, are shown with thick continuous lines. Thin black contours mark the average position of the major ACC fronts (PF—Polar Front, SAF—Subantarctic Front, SAFN—nortern branch of SAF), based on AVISO data from the period 1992–2013 30.