The Southern Ocean is responsible for the uptake of a third of global carbon dioxide through the biological carbon pump and the solubility pump. Its biological carbon pump system is regulated by the availability of the crucial micronutrient iron, with some evidence of potential iron-manganese co-limitation. Iron and manganese play a significant role in functioning of photosynthetic proteins in phytoplankton metabolic processes and the study of their biogeochemical cycles is of great interest. In some parts of this ocean basin, there is still a lack in understanding the effect of seasonal variations in dissolved iron and manganese supply, distributions, and sources. This is due to sparsity of data across the full seasonal cycle, which hampers our understanding of its full biogeochemical cycles. To address this gap, a series of iron and manganese speciation (dissolved and soluble) samples were collected during SCALE winter and spring scientific voyages along the south Atlantic Ocean basin from Cape Town to marginal ice zones. Sample analysis will be conducted using A Flow Injection analyser with Chemiluminescence detection (FIA-CL) and Sector-Field Inductively Coupled Mass Spectrometry (SF-ICP-MS). These measurements will provide an understanding of the seasonal distribution and potential sources of iron and manganese in this ocean basin and improve biogeochemical model parameterization.