"Through a coupling of measurements and modelling, we aim to determine the inter-related controls on oxygen and productivity along the west African margin, from the tip of South Africa to the equator, and to identify implications for natural resources. This margin hosts several socio-economically important ecosystems characterised by different oxygen conditions and levels of productivity. We seek to identify the organising principles underlying the margin’s oxygen dynamics to develop predictive capacity for the region – with regard to oxygen and productivity, and to the biogeochemical and ecosystem-level implications of changes in these parameters."