Saez Moreno et al. (2026): The role of temperature and salinity on ocean alkalinity enhancement performance

Matias Saez Moreno, Jens Hartmann, Janine Börker, Peggy Bartsch, and Charly Andre Moras, IN: EGUsphere, https://doi.org/10.5194/egusphere-2026-3277

Ocean alkalinity enhancement (OAE) is a promising carbon dioxide removal approach but its effectiveness is constrained by uncertainties in dissolution kinetics and carbonate precipitation under varying ocean conditions. Here, the authors systematically quantified the dissolution and net alkalinity delivery of three common OAE feedstocks, i.e., NaHCO₃, Ca(OH)₂, Mg(OH)₂, across 16 temperature–salinity combinations (T = 4, 12, 20, 28 °C and S = 24, 29, 34, 38). Each treatment targeted an alkalinity increase of 500 µmol kg⁻¹ and was monitored over 11 days to track changes in total alkalinity (TA) and dissolved inorganic carbon (DIC).

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