University Of Tasmania

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An update of anthropogenic CO2 storage rates in the western South Atlantic basin and the role of Antarctic Bottom Water

journal contribution
posted on 2023-05-18, 12:56 authored by Rios, AF, Velo, A, Pardo, PC, Hoppema, M, Perez, FF
The western basin of the South Atlantic from 10°N to 55°S and from the coast to the Mid-Atlantic Ridge is a region with large uncertainties as to the storage of anthropogenic CO2 (Cant). Our analysis of data of the last three decades provides a Cant storage rate of 0.92 ± 0.13 mol m− 2 y− 1, i.e., 13%–35% higher than previous estimates in this area. The low but significant Cant concentrations ([Cant]) in the large volume of relatively well ventilated Antarctic Bottom Water (AABW) may well be the underlying cause of this higher storage rate. In fact, the significant contribution in terms of Cant of this ventilated AABW that enters the western South Atlantic Ocean was calculated to be 0.055 ± 0.02 Pg C y− 1 or 0.20 mol m− 2 y− 1. Instead of being based on the annual trend, the Cant specific inventory (in mol m− 2) evolution is more consistently computed as a function of the atmospheric xCO2 perturbation in ppm, (0.64 mol m− 2 ppm− 1). This methodology allows improved projections of Cant storage rates over long periods.


Publication title

Journal of Marine Systems








Institute for Marine and Antarctic Studies


Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

Repository Status

  • Restricted

Socio-economic Objectives

Global effects of climate change (excl. Australia, New Zealand, Antarctica and the South Pacific) (excl. social impacts)