Jeremy Bishop, Unsplash
Mapping the global variation in the efficiency of ocean alkalinity enhancement for carbon dioxide removal
Mengyang Zhou, et al., Nature Plastics & Pollution
One promising method for achieving CO2 removal at scale is ocean alkalinity enhancement (OAE), but there are challenges with incomplete air–sea CO2 equilibration, which reduces the efficiency of carbon removal. Here, we present global maps of OAE efficiency, and assess the seasonal variation in efficiency. We find that the equilibration kinetics have two characteristic timescales: rapid surface equilibration followed by a slower second phase, which represents the re-emergence of excess alkalinity that was initially subducted.
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