Shallow Calcium Carbonate Cycling in the North Pacific Ocean
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The cycling of biologically produced calcium carbonate (CaCO 3) in the ocean is a fundamental component of the global carbon cycle. Here, we present experimental determinations of in situ coccolith and foraminiferal calcite dissolution rates. We combine these rates with solid phase fluxes, dissolved tracers, and historical data to constrain the alkalinity cycle in the shallow North Pacific Ocean. The in situ dissolution rates of coccolithophores demonstrate a nonlinear dependence on saturation state. Dissolution rates of all three major calcifying groups (coccoliths, foraminifera, and aragonitic pteropods) are too slow to explain the patterns of both CaCO 3 sinking flux and alkalinity regeneration in the North Pacific. Using a combination of dissolved and solid‐phase tracers, we document a significant dissolution signal in seawater supersaturated for calcite. Driving CaCO 3 dissolution with a combination of ambient saturation state and oxygen consumption simultaneously explains solid‐phase CaCO 3 flux profiles and patterns of alkalinity regeneration across the entire N. Pacific basin. We do not need to invoke the presence of carbonate phases with higher solubilities. Instead, biomineralization and metabolic processes intimately associate the acid (CO 2) and the base (CaCO 3) in the same particles, driving the coupled shallow remineralization of organic carbon and CaCO 3. The linkage of these processes likely occurs through a combination of dissolution due to zooplankton grazing and microbial aerobic respiration within degrading particle aggregates. The coupling of these cycles acts as a major filter on the export of both organic and inorganic carbon to the deep ocean.
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Dissolution of biogenic CaCO3 has been shown to slow at higher Ω.
“Dissolution of biogenic CaCO3 has also been shown to slow at higher Ω . 75”
From A framework for understanding efficiency losses of Ocean Alkalinity Enhancement (2026) · cites this paper as [75]
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Cited by
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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
Self-citation
- Authors
- Subhas, A. V., Dong, S., Naviaux, J. D., Rollins, N. E., Ziveri, P., Gray, W., Rae, J. W. B., Liu, X., Byrne, R. H., Chen, S., Moore, C., Martell‐Bonet, L., Steiner, Z., Antler, G., Hu, H., Lunstrum, A., Hou, Y., Kemnitz, N., Stutsman, J., Pallacks, S., Dugenne, M., Quay, P. D., Berelson, W. M., & Adkins, J. F.
- Affiliations
- Woods Hole Oceanographic Institution (US)
- California Institute of Technology (US)
- Four Twenty Seven Inc. Sunnyvale CA USA
- University of Southern California (US)
- Institució Catalana de Recerca i Estudis Avançats (ES)
- Université Paris-Saclay (FR)
- University of St Andrews (GB)
- University of South Florida St. Petersburg (US)
- Shanghai Jiao Tong University (CN)
- GEOMAR Helmholtz Centre for Ocean Research Kiel (DE)
- Ben-Gurion University of the Negev (IL)
- Rice University (US)
- University of Washington (US)
- Universitat Autònoma de Barcelona (ES)
- University of Hawaiʻi at Mānoa (US)
- Corresponding author
- Subhas, Adam V.
- ORCID
- Subhas, Adam V.
- Dong, Sijia
- Naviaux, John D.
- Rollins, Nick E.
- Ziveri, Patrizia
- Gray, William
- Rae, James W. B.
- Liu, Xuewu
- Byrne, Robert H.
- Chen, Sang
- Moore, Christopher
- Martell‐Bonet, Loraine
- Steiner, Zvi
- Antler, Gilad
- Hu, Huanting
- Lunstrum, Abby
- Hou, Yi
- Kemnitz, Nathaniel
- Pallacks, Sven
- Dugenne, Mathilde
- Quay, Paul D.
- Berelson, William M.
- Adkins, Jess F.
- Venue
- Global Biogeochemical Cycles
- Publisher
- American Geophysical Union (AGU)
- Published
- 2022-05
- Volume
- 36
- Issue
- 5
- Pages
- e2022GB007388
- ISSN
- 0886-6236 (ISSN-L)
- 1944-9224
- OpenAlex
- W4229082883
- Cited by
- 82
- References
- 3
- Citations by year
- 2026: 9 · 2025: 14 · 2024: 17 · 2023: 38 · 2022: 4
- FWCI
- 9.01
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Global Biogeochemical Cycles (publishedVersion)
- Helmholtz Centre for Ocean Research Kiel (GEOMAR) (acceptedVersion, other-oa)
- HAL (submittedVersion, other-oa)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Open Access Server of the Woods Hole Scientific Community (Woods Hole Scientific Community) (submittedVersion)
- St Andrews Research Repository (St Andrews Research Repository) (submittedVersion)
- Funders
- National Science Foundation (NSF OCE‐1220301, NSF OCE‐1220600)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Keywords
- calcium carbonate dissolution, coccolithophores, foraminifera, pteropods, carbonate saturation state, calcite supersaturation, organic carbon remineralization, particle flux, zooplankton grazing, microbial respiration, North Pacific, carbon cycle
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