Summary
The processes of warming, anthropogenic CO<sub>2</sub> (C<sub>anth</sub>) accumulation, decreasing pH<sub>T</sub> (increasing [H<sup>+</sup>]<sub>T</sub>; concentration in total scale) and calcium carbonate saturation in the subarctic zone of the North Atlantic are unequivocal in the time-series measurements of the Iceland (IS-TS, 1985-2003) and Irminger Sea (IRM-TS, 1983-2013) stations. Both stations show high rates of C<sub>anth</sub> accumulation with different rates of warming, salinification and stratification linked to regional circulation and dynamics. At the IS-TS, advected and stratified waters of Arctic origin drive a strong increase in [H<sup>+</sup>]<sub>T</sub>, in the surface layer, which is nearly halved in the deep layer (44.7 ± 3.6 and 25.5 ± 1.0 pmol kg<sup>-1</sup> yr<su
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