An assessment of CO2 storage and sea-air fluxes for the Atlantic Ocean and Mediterranean Sea between 1985 and 2018

From 1985 to 2018, pCO2 products suggest a lower mean CO2 uptake (0.36±0.06 PgC yr -1 ) than ocean models (0.47±0.15 PgC yr -1 )• Since 2000, the CO2 uptake is increasing twice as fast in the pCO2 products compared to the models.• Major differences between models and pCO2 products are attributed to the outgassing of riverine carbon and the seasonal cycle of pCO2.