Anthropogenic CO2 changes in the Equatorial Atlantic Ocean

Fajar, N. M.; Guallart, E. F.; Steinfeldt, R.; Ríos, A. F.; Pelegrí, J. L.; Pelejero, C.; Calvo, E.; Pérez, F. F.
Progress in Oceanography
Methods based on CO2 and CFC data are used to describe and evaluate the anthropogenic CO2 (Cant) concentrations, Cant specific inventories and Cant storage rates in the Equatorial Atlantic Ocean. The Cant variability in the water masses is evaluated from the comparison of two hydrographic sections along 7.5ºN, carried out in 1993 and 2010. During both cruises, high Cant concentrations are detected in the upper layers, with values decreasing progressively towards the deep layers. Overall, the Cant concentrations increase from 1993 to 2010, with a large increment in the upper North Atlantic Deep Water layer, of about 0.18 ± 0.03 μmol*kg-1*y-1. In 2010, the Cant inventory along the whole section amounts to 58.9 ± 2.2 and 45.1 ± 2.0 mol*m-2 using CO2 and CFC based methods, respectively, with most Cant accumulating in the western basin. Considering the time elapsed between the two cruises, Cant storage rates of 1.01 ± 0.18 and 0.75 ± 0.17 mol*m-2*y-1 (CO2 and CFC based methods, respectively) are obtained. Below ~1000 m, these rates follow the pace expected from a progressive increase of Cant at steady state; above ~1000 m, Cant increases faster, mainly due to the retreat of the Antarctic Intermediate Waters.
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