An end to the “rain ratio” reign?
Open accessAbstract
One of the most elegant mechanisms forwarded for late Quaternary atmospheric CO 2 variability concerns the sensitivity of calcium carbonate preservation in deep ocean sediments to the relative delivery rates of calcium carbonate and particulate organic carbon (the CaCO 3:POC “rain ratio”). It was implicitly assumed that any change in the CaCO 3:POC rain ratio of biogenic material produced in the surface ocean will be communicated directly to the sediments. This would allow relatively subtle shifts in ecosystem composition to affect sedimentary CaCO 3 preservation (and thus atmospheric CO 2). However, recent research into the controls on the transport of POC to depth suggests that the rain ratio “seen” by the sediments may instead be buffered against any perturbation occurring at the surface. This casts doubt on the viability of hypotheses envisaging ecological changes as a means of accounting for the observed glacial‐interglacial CO 2 signal.
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The analysis has not included a possible dependence of carbonate rain fluxes on the efficiency of organic matter transport into the deep ocean, which would reduce the predicted impact of CO2-calcification feedback on the sediments.
“One caveat to this analysis it that we have not included a possible dependence of carbonate rain fluxes on the efficiency of organic matter transport into the deep ocean [Armstrong et al., 2002;Klaas and Archer, 2002], which would reduce our predicted impact of CO 2calcification feedback on the sediments [Ridgwell, 2003].”
From Regulation of atmospheric CO <sub>2</sub> by deep‐sea sediments in an Earth system model (2007) · cites this paper as Ridgwell, 2003
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References 24 · Cited by 52
- Authors
- Ridgwell, A. J.
- Affiliations
- University of California, Riverside (US)
- Corresponding author
- Ridgwell, Andy J.
- ORCID
- Ridgwell, Andy J.
- Venue
- Geochemistry, Geophysics, Geosystems
- Publisher
- American Geophysical Union (AGU)
- Published
- 2003-06
- Volume
- 4
- Issue
- 6
- ISSN
- 1525-2027 (ISSN-L)
- OpenAlex
- W1758831361
- Cited by
- 52
- References
- 24
- Citations by year
- 2025: 2 · 2024: 3 · 2023: 6 · 2022: 1 · 2021: 1 · 2019: 4 · 2016: 1 · 2013: 2 · 2012: 3
- FWCI
- 2.28
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geochemistry Geophysics Geosystems (publishedVersion)
- Bristol Research (University of Bristol) (publishedVersion)
- Funders
- University of East Anglia
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Keywords
- deep-sea sediments, particulate organic carbon, carbonate pump, biological carbon pump
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