The expanding fleet of BGC-Argo floats in the Southern Ocean, mostly from the French SOCLIM and US SOCCOM programs, presents rich opportunities for the analysis of biogeochemical processes, in the context of other observations such as satellite physics and ocean color. This presentation will provide an overview of ongoing projects at the University of Tasmania. This work spans (1) comparisons of productivity and export across frontal zones, including the seasonal ice zone that has previously been overlooked by satellite data; (2) investigations of spatial and temporal variability in the export of large and small particles, including an analysis of relationships to surface properties and subsurface oxygen dynamics; (3) analysis of bloom phenology using variability in chlorophyll, carbon and nitrate; and (4) detection of links between atmospheric dust deposition and seasonal nutrient drawdown. As the fleet expands, there will be greater emphasis on seasonal and interannual variability, eventually to detection of climate signals.