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Decadal-scale changes in the meridional circulation of the Southern Ocean south of Australia are studied, over the period 1958-2005, using Simple Ocean Data Assimilation (SODA) reanalysis data. Upper Circumpolar Deep Water (UCDW) is found to upwell nearer to the surface over time, while the mixed layer (ML) is found to deepen, leading to an increase in the number of times that UCDW intrudes into the ML. This entrainment of nutrients, especially iron, into the ML from UCDW, is crucial fordoi:10.1111/j.1600-0870.2010.00462.x fatcat:hr2ltmkdjvba3a52pwufifripy