Calcium carbonate dissolution patterns in the ocean
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In the natural carbon cycle, the sinking of biogenic carbonate minerals exports an estimated 1 Gt of carbon from the surface ocean per year (equivalent to approximately 10 Mmol of alkalinity).
“In the natural C cycle, the sinking of biogenic carbonate minerals exports an estimated 1 Gt of C from the surface ocean per year (equivalent to approximately 10 Mmol of alkalinity). 68,73”
From A framework for understanding efficiency losses of Ocean Alkalinity Enhancement (2026) · cites this paper as [73]
The ‘reconstructed CaCO3 export and sinks’ section reports a global sinking CaCO3 flux of 76 ± 12 Tmol per year at 300 m, equivalent to about 0.9 Gt of carbon per year and consistent with the approximate 1 Gt claim. Our copy does not report an equivalent flux of approximately 10 Mmol of alkalinity; that part is unsupported. (LLM, conf=0.90)
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Cites
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A framework for understanding efficiency losses of Ocean Alkalinity Enhancement
Lunstrum, A., Keller, D., Hartmann, J., & Moras, C. (2026) · CDRxiv · doi:10.70212/cdrxiv.2026517.v1 · Cited by 1 · see citing works
- Authors
- Sulpis, O., Jeansson, E., Dinauer, A., Lauvset, S. K., & Middelburg, J. J.
- Affiliations
- Utrecht University (NL)
- Bjerknes Centre for Climate Research (NO)
- University of Bern (CH)
- Venue
- Nature Geoscience
- Published
- 2021-05-10
- Volume
- 14
- Issue
- 6
- Pages
- 423-428
- ISSN
- 1752-0894 (ISSN-L)
- 1752-0908
- OpenAlex
- W3160637205
- Cited by
- 177
- References
- 3
- Citations by year
- 2026: 27 · 2025: 27 · 2024: 42 · 2023: 58 · 2022: 20 · 2021: 3
- FWCI
- 14.43
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Nature Geoscience (publishedVersion)
- HAL (submittedVersion, cc-by)
- Utrecht University Repository (Utrecht University) (submittedVersion, other-oa)
- Utrecht University Repository (Utrecht University) (submittedVersion)
- Funders
- Netherlands Earth System Science Centre
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Universität Bern
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- calcium carbonate dissolution, seawater carbonate chemistry, deep ocean, ocean carbon cycle
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