This dataset contains the CARIOCA (Carbon Interface Ocean Atmosphere) buoy hourly measurements which was deployed at 00° 02.081 W, 53° 59.688 S, on the 23 January 2022, during the SO-CHIC (Southern Ocean Carbon and Heat Impact on Climate) cruise (December 2021/January 2022, S.A. Agulhas II). The buoy acquired 17 months of data and stopped functioning on the 24 June 2023. The drifting buoy monitored surface hourly fCO2 (fugacity of CO2), dissolved oxygen (O2), salinity (S), temperature (T), fluorescence, wind speed and atmospheric pressure. The cruise report is available at : https://doi.org/10.5281/zenodo.6948850