Seawater samples (500 mL) were taken during the PIRATA FR-32 cruise to measure surface inorganic carbon and alkalinity. The analyses were realised by potentiometric titration using a closed-cell at the SNAPO-CO2, LOCEAN in Paris.

The fugacity of CO2 (fCO2) was measured underway during the PIRATA FR-32 cruise in the Eastern Tropical Atlantic using an infrared detection technique.