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The Arctic Ocean is acidifying from absorption of man-made CO 2 . Current predictive models of that acidification focus on surface waters, and their results argue that deep waters will acidify by downward penetration from the surface. Here we show, with an alternative model, the rapid, near simultaneous, acidification of both surface and deep waters, a prediction supported by current, but limited, saturation data. Whereas Arctic surface water responds directly by atmospheric CO 2  uptake, deeper waters will be influenced strongly by intrusion of mid-depth, pre-acidified, Atlantic Ocean water. With unabated CO 2  emissions, surface waters will become undersaturated with respect to aragonite by 2105  AD  and could remain so for ∼600 years. In deep waters, the aragonite saturation horizon will rise, reaching the base of the surface mixed layer by 2140  AD  and likely remaining there for over a millennium. The survival of aragonite-secreting organisms is consequently threatened on long timescales.

Disparate acidification and calcium carbonate desaturation of deep and shallow waters of the Arctic Ocean