Figure 2.

Plot of CFC-11 concentration as a function of PO₄* for waters south of 40°S from depths less than 500 m and with temperatures less than 3°C. As can be seen, many of the points scatter around a mixing line joining the compositions of CFC-11 free water with a PO₄* value of 1.38 μmol/kg (characteristic of upwelling circumpolar deep water) and water with a PO₄* value of 1.95 μmol/kg (characteristic of newly forming deep water). As can be seen, this water is about 75% saturated with CFC-11.