Artificial ocean alkalinization (AOA) is one of the most promising marine carbon dioxide removal technologies, but the relevant influence on the marine carbon chemistry remain unclear. We applied the data from the 6th Coupled Model Intercomparison Project (CMIP6) to characterize the temporal and spatial variabilities of future marine carbon chemistry under the implementation of AOA. Our study shown the marine carbon system varied significantly under the implement of AOA, but some specific influence may be covered up by the forcing of high carbon emission scenario SSP5-8.5. Basing on the CMIP6 protocol, which added 0.14 Pmol alkalinity into the ocean annually, AOA promoted the increase of DIC, delayed the rise of pCO₂, and restrained the aggravation of pH and Ω, actually. The temperate oceans in both hemispheres were the most significant impacted basins, whereas the Southern Ocean was least affected. In the present century, the oceanic carbon sink would intensify rapidly until the year around 2080, and then weaken slowly. Implementation of AOA merely changed the relative strength of oceanic sink rather than its variation pattern. In the deep ocean, what’s more, the effect of AOA did exist, but was quite little for the mitigation of ocean acidification.
 

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