The efficacy of enhancing carbonate weathering for carbon dioxide sequestration ...
Enhanced weathering is a geoengineering strategy aiming to remove atmospheric CO2 by increasing continental weathering rates, thereby increasing the delivery of atmospheric carbon (chiefly present as HCO3- in natural waters) to the oceans. Most enhanced weathering studies have focused on the capacit...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Frontiers Media
2022
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.17863/cam.85785 https://www.repository.cam.ac.uk/handle/1810/338373 |
| Summary: | Enhanced weathering is a geoengineering strategy aiming to remove atmospheric CO2 by increasing continental weathering rates, thereby increasing the delivery of atmospheric carbon (chiefly present as HCO3- in natural waters) to the oceans. Most enhanced weathering studies have focused on the capacity of silicate rocks (e.g. basalt) and minerals (e.g. olivine, Mg2SiO4 or wollastonite CaSiO3) have to remove atmospheric CO2. However, carbonate minerals (e.g. calcite, CaCO3) could additionally provide a rapid way to increase HCO3- export to the oceans on timescales relevant to human induced increases in atmospheric CO2. Recent work suggests 0.84 Gt C/yr (~15% of annual increases in atmospheric carbon) could be removed from the atmosphere through enhanced dissolution of calcite in high pCO2 soil waters, provided carbonic acid is the main dissolution agent. However, it is not clear whether the atmospheric CO2 dissolved in soil environments can be transported in solution to the oceans via rivers, which typically ... |
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