CDR Verification Framework Documentation
Docs: Component
Mineral dissolution (alkalinity release)
Uncertainty
Environmental conditions may result in different fractions of carbonate (CO₃⁻²) versus bicarbonate (HCO₃⁻). This fractionation impacts the total uptake of atmospheric CO₂. Overall CO₂ uptake efficiency can be estimated using seawater chemistry modeling software and the equation presented in Renforth & Henderson (2017). These estimates could also be validated by measurements of bicarbonate concentrations or total alkalinity in the water column. The conversion of alkalinity to CO₂ removal is estimated to be 70-95% on a mol to mol basis.
Applicable pathways
Pathway
VCL
Ocean Alkalinity Enhancement (Mineral)
1-3
Revision history
Apr 10 2023
Edited component text for clarity. Edited uncertainty range from Low-Medium to Low-Low to reflect more realistic uncertainties for model parameterization, and temperature and salinity variability. This edit was made as part of a broader update to the OAE-mineral pathway, described here.
Sep 19 2022
First release.
Mineral dissolution (alkalinity release)
Uncertainty
Environmental conditions may result in different fractions of carbonate (CO₃⁻²) versus bicarbonate (HCO₃⁻). This fractionation impacts the total uptake of atmospheric CO₂. Overall CO₂ uptake efficiency can be estimated using seawater chemistry modeling software and the equation presented in Renforth & Henderson (2017). These estimates could also be validated by measurements of bicarbonate concentrations or total alkalinity in the water column. The conversion of alkalinity to CO₂ removal is estimated to be 70-95% on a mol to mol basis.
Applicable pathways
Pathway
VCL
Ocean Alkalinity Enhancement (Mineral)
1-3
Revision history
Apr 10 2023
Edited component text for clarity. Edited uncertainty range from Low-Medium to Low-Low to reflect more realistic uncertainties for model parameterization, and temperature and salinity variability. This edit was made as part of a broader update to the OAE-mineral pathway, described here.
Sep 19 2022
First release.