GEOCARB III: A revised model of atmospheric CO2 over Phanerozoic time
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Revision of the GEOCARB model (Berner, 1991, 1994) for paleolevels of atmospheric CO~2~, has been made with emphasis on factors affecting CO~2~ uptake by continental weathering. This includes: (1) new GCM (general circulation model) results for the dependence of global mean surface temperature and runoff on CO~2~, for both glaciated and non-glaciated periods, coupled with new results for the temperature response to changes in solar radiation; (2) demonstration that values for the weathering-uplift factor f~R~(t) based on Sr isotopes as was done in GEOCARB II are in general agreement with independent values calculated from the abundance of terrigenous sediments as a measure of global physical erosion rate over Phanerozoic time; (3) more accurate estimates of the timing and the quantitative effects on Ca-Mg silicate weathering of the rise of large vascular plants on the continents during the Devonian; (4) inclusion of the effects of changes in paleogeography alone (constant CO~2~ and solar radiation) on global mean land surface temperature as it affects the rate of weathering; (5) consideration of the effects of volcanic weathering, both in subduction zones and on the seafloor; (6) use of new data on the δ^13^C values for Phanerozoic limestones and organic matter; (7) consideration of the relative weather- ing enhancement by gymnosperms versus angiosperms; (8) revision of paleo land area based on more recent data and use of this data, along with GCM-based paleo-runoff results, to calculate global water discharge from the continents over time. Results show a similar overall pattern to those for GEOCARB II: very high CO~2~ values during the early Paleozoic, a large drop during the Devonian and Carbonifer- ous, high values during the early Mesozoic, and a gradual decrease from about 170 Ma to low values during the Cenozoic. However, the new results exhibit considerably higher CO~2~ values during the Mesozoic, and their downward trend with time agrees with the independent estimates of Ekart and others (1999). Sensitivity analysis shows that results for paleo-CO~2~ are especially sensitive to: the effects of CO~2~ fertilization and temperature on the acceleration of plant-mediated chemical weathering; the quantitative effects of plants on mineral dissolution rate for constant temperature and CO~2~; the relative roles of angiosperms and gymnosperms in accelerating rock weather- ing; and the response of paleo-temperature to the global climate model used. This emphasizes the need for further study of the role of plants in chemical weathering and the application of GCMs to study of paleo-CO~2~ and the long term carbon cycle.
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Precipitation of carbonate minerals as a consequence of silicate weathering contributes to stabilization of atmospheric CO2 over geological time periods and to formation of pedogenic carbonates in natural and artificial soils over shorter time scales.
“The precipitation of carbonate minerals as a consequence of silicate weathering contributes to the stabilization of atmospheric CO 2 over geological time periods 4,7 and also contributes to the formation of pedogenic carbonates in both natural 8 and artificial soils 9 over much shorter time scales.”
From Rapid Removal of Atmospheric CO2 by Urban Soils (2015) · cites this paper as [7]
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- Authors
- Berner, R. A.
- Affiliations
- Yale University (US)
- Corresponding author
- Berner, R. A.
- Venue
- American Journal of Science
- Publisher
- American Journal of Science (AJS)
- Published
- 2001-02-01
- Volume
- 301
- Issue
- 2
- Pages
- 182-204
- ISSN
- 0002-9599 (ISSN-L)
- OpenAlex
- W4245300726
- Cited by
- 1,323
- References
- 27
- Citations by year
- 2026: 57 · 2025: 42 · 2024: 61 · 2023: 49 · 2022: 61 · 2021: 52 · 2020: 62 · 2019: 62 · 2018: 56 · 2017: 54 · 2016: 60 · 2015: 58 · 2014: 40 · 2013: 56 · 2012: 60
- FWCI
- 32.22
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- American Journal of Science (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Earth Systems and Cosmic Evolution
- Keywords
- atmospheric CO2, continental weathering, silicate weathering, strontium isotopes, terrigenous sediments, volcanic weathering, subduction zone, paleogeography, global mean temperature, CO2 fertilization, gymnosperms, flowering plants, carbon isotope stratigraphy, limestone, organic matter, sensitivity analysis
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