Ocean Alkalinity Enhancement (OAE) is a marine-based carbon dioxide removal (CDR) strategy that aims to increase the ocean's capacity to absorb and store atmospheric CO2. This is achieved by adding alkaline minerals, such as olivine, limestone, or quicklime, to seawater, which reacts with CO2 to form stable bicarbonate ions, thereby reducing ocean acidity and enhancing CO2 uptake. Projects like the OAE Project by GEOMAR Helmholtz Centre for Ocean Research Kiel and the University of Exeter's Plymouth Marine Laboratory are key research entities. OAE is currently in the advanced research and small-scale experimental stage, with laboratory and mesocosm experiments characterizing reaction rates and potential ecosystem impacts. Unlike terrestrial carbon capture, OAE directly leverages the ocean's vast carbon sink capacity.
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Why It Matters
Ocean acidification, caused by excess CO2 absorption, threatens marine calcifiers (corals, shellfish) and marine food webs, impacting fisheries worth billions and the health of the entire ocean ecosystem. OAE could significantly reduce atmospheric CO2, combat ocean acidification, and restore marine biodiversity, leading to healthier oceans and more resilient coastal communities. Coastal communities and marine industries (fishing, aquaculture) would stand to gain, while unexpected ecological shifts or mineral supply chain issues could pose risks. Major technical hurdles include efficient, cost-effective, and environmentally safe methods for mineral dissolution and dispersion at scale, along with comprehensive monitoring of ecological impacts. Initial pilot deployments are anticipated in the 2030s, with scalable solutions potentially by 2050, dependent on robust environmental impact assessments. Germany, the UK, and the US are actively funding OAE research. A second-order consequence could be unintended changes in trace metal availability or nutrient cycling in marine ecosystems, potentially altering phytoplankton blooms and broader food web dynamics.
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