The Southern Ocean is the largest carbon sink of the global ocean, responsible for approximately one-quarter of oceanic carbon dioxide uptake. Its central role in the global carbon cycle stems from its unique circulation, deep water formation, and ability to sequester atmospheric CO₂ on long timescales. However, this region remains one of the most challenging to observe and predict, and our understanding of its carbon dynamics-particularly in the face of rapid climate change-is constrained by limited in situ data and model limitations. This session will explore the mechanisms driving carbon cycling in the Southern Ocean, with a focus on changing conditions impact on both organic and inorganic carbon processes. We invite studies examining these dynamics across various spatio-temporal scales, from Antarctic continental shelves to the open ocean. We welcome contributions that span observational, experimental, and modelling approaches, particularly those that leverage or advance novel platforms and tools (e.g., autonomous vehicles, biogeochemical floats, e-DNA, citizen science). Emphasis will be placed on studies addressing carbonate chemistry, biological carbon cycling, air-sea gas exchange, and the solubility and biological pumps. We also encourage work on data integration, predictive modelling, and observing system. We encourage contributions from researchers at all career stages.

• Climate and Ocean Change -
• High Latitude Environments -
• Ocean Biology and Biogeochemistry -