Geoengineering potential of artificially enhanced silicate weathering of olivine
Open accessAbstract
Geoengineering is a proposed action to manipulate Earth’s climate in order to counteract global warming from anthropogenic greenhouse gas emissions. We investigate the potential of a specific geoengineering technique, carbon sequestration by artificially enhanced silicate weathering via the dissolution of olivine. This approach would not only operate against rising temperatures but would also oppose ocean acidification, because it influences the global climate via the carbon cycle. If important details of the marine chemistry are taken into consideration, a new mass ratio of CO 2 sequestration per olivine dissolution of about 1 is achieved, 20% smaller than previously assumed. We calculate that this approach has the potential to sequestrate up to 1 Pg of C per year directly, if olivine is distributed as fine powder over land areas of the humid tropics, but this rate is limited by the saturation concentration of silicic acid. In our calculations for the Amazon and Congo river catchments, a maximum annual dissolution of 1.8 and 0.4 Pg of olivine seems possible, corresponding to the sequestration of 0.5 and 0.1 Pg of C per year, but these upper limit sequestration rates come at the environmental cost of p H values in the rivers rising to 8.2. Open water dissolution of fine-grained olivine and an enhancement of the biological pump by the rising riverine input of silicic acid might increase our estimate of the carbon sequestration, but additional research is needed here. We finally calculate with a carbon cycle model the consequences of sequestration rates of 1–5 Pg of C per year for the 21st century by this technique.
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Ocean Alkalinity Enhancement (OAE) has been proposed as a promising marine carbon dioxide removal strategy.
“Ocean Alkalinity Enhancement (OAE) has been proposed as a promising marine carbon dioxide removal strategy.”
From Biogeochemical responses to ocean alkalinity enhancement in the North China Sea (2026) · cites this paper as Köhler et al., 2010
The measured SSA of a granular material is typically much higher than estimates of the surface area by geometric models of particle shapes, due to surface topography and porosity effects.
“The measured SSA of a granular material is typically much higher than estimates of the surface area by geometric models of particle shapes, due to surface topography and porosity effects 15 .”
From Potential for large-scale CO2 removal via enhanced rock weathering with croplands (2020) · cites this paper as [15]
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Biogeochemical responses to ocean alkalinity enhancement in the North China Sea
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- Authors
- Köhler, P., Hartmann, J., & Wolf-Gladrow, D. A.
- Affiliations
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (DE)
- Universität Hamburg (DE)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2010-11-08
- Volume
- 107
- Issue
- 47
- Pages
- 20228-20233
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC2996662
- OpenAlex
- W1608266851
- Cited by
- 384
- References
- 48
- Citations by year
- 2026: 30 · 2025: 31 · 2024: 62 · 2023: 61 · 2022: 48 · 2021: 24 · 2020: 15 · 2019: 18 · 2018: 13 · 2017: 22 · 2016: 7 · 2015: 14 · 2014: 12 · 2013: 12 · 2012: 11
- FWCI
- 7.46
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Helmholtz-Zentrum für Polar-und Meeresforschung (Alfred-Wegener-Institut) (acceptedVersion)
- Helmholtz-Zentrum für Polar-und Meeresforschung (Alfred-Wegener-Institut) (submittedVersion)
- Max Planck Digital Library (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate Change and Geoengineering
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Keywords
- geoengineering, olivine dissolution, carbon sequestration, ocean acidification, silicic acid, biological carbon pump, carbon cycle models, climate change mitigation
- MeSH terms
- Carbon Dioxide, Hydrogen-Ion Concentration, Models, Chemical, Magnesium Compounds, Silicates, Rivers, Climate Change, Carbon Sequestration, Iron Compounds
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