Grosselindemann et al. (2026): The efficiency and ocean acidification mitigation potential of ocean alkalinity enhancement on multi-centennial timescales
Hendrik Grosselindemann, Friedrich A. Burger, and Thomas L. Frölicher, IN: Biogeosciences, https://doi.org/10.5194/bg-23-3299-2026
Carbon dioxide removal (CDR) strategies such as ocean alkalinity enhancement (OAE) are likely required in addition to rapid emissions reductions to limit global warming to well below 2 °C. However, the long-term efficiency of OAE and its potential to mitigate climate change and ocean acidification remain uncertain. Here, the authors investigate efficiencies, climate and ocean acidification responses of idealized OAE using a fully coupled, emission-driven Earth system model across three global warming stabilization scenarios (1.5, 2, and 3 °C) spanning 1861–2500. OAE is implemented as a continuous global surface alkalinity addition of 0.14 Pmol yr−1 following the CDRMIP protocol from 2026 onward.