Anthropogenic carbon pathways towards the North Atlantic interior revealed by Argo-O, neural networks and back-calculations.

The subpolar North Atlantic (SPNA) is a region of high anthropogenic CO (C) storage per unit area. Although the average C distribution is well documented in this region, the C pathways towards the ocean interior remain largely unresolved. We used observations from three Argo-O floats spanning 2013-2018 within the SPNA, combined with existing neural networks and back-calculations, to determine the C evolution along the float pathways from a quasi-lagrangian perspective.

The Northeast Atlantic is running out of excess carbonate in the horizon of cold-water corals communities.

The oceanic uptake of atmospheric carbon dioxide (CO) emitted by human activities alters the seawater carbonate system. Here, the chemical status of the Northeast Atlantic is examined by means of a high-quality database of carbon variables based on the GO-SHIP A25 section (1997-2018). The increase of atmospheric CO leads to an increase in ocean anthropogenic carbon (C) and a decrease in carbonate that is unequivocal in the upper and mid-layers (0-2,500 m depth).