| Autor: |
Knapp, William J., Stevenson, Emily I., Renforth, Phil, Ascough, Philippa L., Knight, Alasdair C. G., Bridgestock, Luke, Bickle, Michael J., Lin, Yongjie, Riley, Alex L., Mayes, William M., Tipper, Edward T. |
| Přispěvatelé: |
NERC, EPSRC, University of St Andrews. School of Earth & Environmental Sciences |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Popis: |
Funding: W.J.K. acknowledges funding from NERC studentship NE/S007164/1. The radiocarbon analyses were supported by the National Environmental Isotope Facility (NEIF) under grant NE/S011587/1 (allocation number 2442.1021). E.T.T. acknowledges funding from NERC grants NE/T007214/1, NE/P011659/1, and NE/M001865/1. P.R. and W.M.M. acknowledge funding from UKRI greenhouse gas removal research programme (NE/P019943/1), and P.R. acknowledges funding from the Industrial Decarbonisation Research and Innovation Centre (EP/V027050/1). Enhanced weathering is a carbon dioxide (CO2) mitigation strategy that promises large scale atmospheric CO2 removal. The main challenge associated with enhanced weathering is monitoring, reporting, and verifying (MRV) the amount of carbon removed as a result of enhanced weathering reactions. Here, we study a CO2 mineralization site in Consett, Co. Durham, UK, where steel slags have been weathered in a landscaped deposit for over 40 years. We provide new radiocarbon, δ13C, 87Sr/86Sr, and major element data in waters, calcite precipitates, and soils to quantify the rate of carbon removal. We demonstrate that measuring the radiocarbon activity of CaCO3 deposited in waters draining the slag deposit provides a robust constraint on the carbon source being sequestered (80% from the atmosphere, 2σ = 8%) and use downstream alkalinity measurements to determine the proportion of carbon exported to the ocean. The main phases dissolving in the slag are hydroxide minerals (e.g., portlandite) with minor contributions ( |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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