The South-East Pacific (SEP) plays a key role in the global carbon cycle. However, despite its importance, its ability to absorb anthropogenic carbon dioxide (CO 2 ) remains poorly constrained due to strong variability and spatial heterogeneity in the air-sea carbon flux (FCO 2 ). Uncertainties persist regarding the contrasting responses of the northern upwelling system and of the southern fjord-dominated region, as well as th...