The tritium and radiocarbon measurements taken at the Southern Ocean GEOSECS stations were analyzed. Excess CO₂ for the Atlantic GEOSECS stations 76, 77, 82, 85, 87, 89, 91 and for all the atations of the SOMOV-81 cruise were correlated with the radiotracer data. Radiocarbon and excess CO₂ support the tritium data showing that these tracers are not homogeneously distributed in the deep-water column. The preformed radiocarbon value of the Antarctic Surface water component in the Antarctic Bottom Water was estimated to be -139.3 x 10^-3.