Geostrophic eddies control the meridional mixing of heat, carbon, and other climatically important tracers in the Southern Ocean. We will report the first direct estimates of eddy mixing across the Southern Ocean from the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean. The estimates are based on the dispersion of an anthropogenic tracer and floats over a period of two years. We find that mixing is weak in the upper 2 km and enhanced at depth. A simple stochastic model will be introduced to interpret these variations and explain their importance for climate models.