Decadal acidification in the water masses of the Atlantic Ocean.

摘要: Global ocean acidification is caused primarily by the ocean’s uptake of CO2 as a consequence increasing atmospheric levels. We present observations oceanic decrease in pH at basin scale (50°S–36°N) for Atlantic Ocean over two decades (1993–2013). Changes associated with anthropogenic (ΔpHCant) and variations biological activity circulation (ΔpHNat) are evaluated different water masses. Output from an Institut Pierre Simon Laplace climate model used to place results into longer-term perspective elucidate mechanisms responsible change. The largest decreases (∆pH) were observed central, mode, intermediate waters, maximum ΔpH value South Central Waters −0.042 ± 0.003. trended toward zero deep bottom waters. Observations show that changes generally dominated component, which accounts rates between −0.0015 −0.0020/y central natural components same order magnitude reinforce one another mode waters time period. Large negative ΔpHNat values driven content consistent (i) poleward shift formation region during positive phase Southern Annular Mode (ii) increase rate mass North Atlantic.