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Redfield revisited: 2. What regulates the oxygen content of the atmosphere?
Open accessAbstract
The continuous charcoal record, interpreted with the aid of the results of combustion experiments, indicates that the mixing ratio of atmospheric oxygen has varied remarkably little over the past 350 Myr. We develop a dynamic feedback model of the coupled P, N, C, and O 2 cycles and use perturbation analysis and a case study of the past 40 Myr to test various feedback mechanisms that have been proposed to stabilize atmospheric oxygen. These mechanisms involve alterations in nutrient driven productivity and the subsequent burial flux of organic carbon, which provides the main source of atmospheric oxygen. Suppression of the burial of phosphorus sorbed to iron minerals under anoxic conditions in ocean bottom waters tends to increase the ocean nutrient inventory and provide negative feedback against declining oxygen [Holland, 1994]. However, denitrification is enhanced by anoxia, tending to reduce the nutrient inventory and amplify declining oxygen [Lenton and Watson, this issue]. If organic phosphorus removal from the ocean is also suppressed under anoxic conditions, this improves oxygen regulation [Van Cappellen and Ingall, 1994], as does direct enhancement of organic carbon burial due to reduced oxygen concentration in bottom waters [Betts and Holland, 1991]. However, all of the ocean‐based feedback mechanisms cease to operate under increases in oxygen that remove anoxia from the ocean. Fire frequency is extremely sensitive to increases in oxygen above 21% of the atmosphere, readily suppressing vegetation on the land surface. This should transfer phosphorus from the land to the ocean, causing less carbon to be buried per unit of phosphorus and providing a weak negative feedback on oxygen [Kump, 1988]. However, a new proposal that increases in oxygen suppress the biological amplification of rock weathering and hence the input of phosphorus to the Earth system provides the most effective oxygen regulation of all the mechanisms considered. A range of proxies suggests that the input of available phosphorus to the ocean may have been significantly reduced 40 Myr ago, suppressing new production and organic carbon burial in the model. With only ocean‐based feedback, the atmospheric oxygen reservoir is predicted to have shrunk from ∼26% of the atmosphere 40 Myr ago. However, when land plant mediated negative feedback on phosphorus weathering is added, oxygen is regulated within 19–21% of the atmosphere throughout the past 40 Myr, in a manner more consistent with paleorecords.
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“Models for Phanerozoic oxygen regulation1128 tend to focus on strong negative feedbacks on organic carbon burial29 (that is, that the production rate of oxygen decreases as oxygen rises), and any negative feedback on oxidative weathering is estimated to be relatively weak3031 (or non-existent2832).”
From Atmospheric oxygen regulation at low Proterozoic levels by incomplete oxidative weathering of sedimentary organic carbon (2017) · cites this paper as [29]
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“However, plants and their associated mycorrhizal fungi can increase phosphorus weathering (20 -22), and this could be sustained on longer timescales if they preferentially weather phosphorus relative to alkalinity.”
From Earliest land plants created modern levels of atmospheric oxygen (2016) · cites this paper as [22]
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“new fire-mediated negative feedbacks on O2 were instigated that have played a key role in stabilizing atmospheric O2 concentration up to the present day (22, 43).”
From Earliest land plants created modern levels of atmospheric oxygen (2016) · cites this paper as [22]
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Citations
Cites
A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species
Farquhar, G. D., von Caemmerer, S., & Berry, J. A. (1980) · Planta · doi:10.1007/bf00386231 · Cited by 8,796
The biological control of chemical factors in the environment.
Ac, R. (1960) · PubMed · Cited by 3,989
Climatological Atlas of the World Ocean
Levitus, S. (1983) · Eos, Transactions American Geophysical Union · doi:10.1029/eo064i049p00962-02 · Cited by 3,078
Sedimentary organic matter preservation: an assessment and speculative synthesis
Hedges, J. I., & Keil, R. G. (1995) · Marine Chemistry · doi:10.1016/0304-4203(95)00008-f · Cited by 2,546
Tectonic forcing of late cenozoic climate.
Raymo, M. E., & Ruddiman, W. F. (1992) · Nature · doi:10.1038/359117a0 · Cited by 2,341
The solubility of nitrogen, oxygen and argon in water and seawater
Weiss, R. F. (1970) · Deep Sea Research and Oceanographic Abstracts · doi:10.1016/0011-7471(70)90037-9 · Cited by 1,975
The Chemical Evolution of the Atmosphere and Oceans
Holland, H. D. (1984) · doi:10.1515/9780691220239 · Cited by 1,836
GEOCARB II; a Revised Model of Atmospheric CO 2 Over Phanerozoic Time
Berner, R. A. (1994) · American Journal of Science · doi:10.2475/ajs.294.1.56 · Cited by 1,713
Parton, W. J., Scurlock, J. M. O., Ojima, D. S., Gilmanov, T. G., Scholes, R. J., Schimel, D. S., Kirchner, T., Menaut, J., Seastedt, T., Garcia Moya, E., et al. (1993) · Global Biogeochemical Cycles · doi:10.1029/93gb02042 · Cited by 1,319
Redfield ratios of remineralization determined by nutrient data analysis
Anderson, L. A., & Sarmiento, J. L. (1994) · Global Biogeochemical Cycles · doi:10.1029/93gb03318 · Cited by 1,252
Pedersen, T. F., & Calvert, S. E. (1990) · AAPG Bulletin · doi:10.1306/0c9b232b-1710-11d7-8645000102c1865d · Cited by 1,180
Effects of climate on chemical_ weathering in watersheds
White, A. F., & Blum, A. E. (1995) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(95)00078-e · Cited by 1,150
The chemistry of the atmosphere and oceans
Sibley, D. F. (1979) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(79)90059-0 · Cited by 1,141
(1978) · Medical Entomology and Zoology · Cited by 1,073
Müller, P., & Suess, E. (1979) · Deep Sea Research Part A Oceanographic Research Papers · doi:10.1016/0198-0149(79)90003-7 · Cited by 1,057
C3, C4: Mechanisms and Cellular and Environmental Regulation of Photosynthesis
Edwards, G., & Walker, D. B. (1983) · Medical Entomology and Zoology · Cited by 916
Influence of oxygen exposure time on organic carbon preservation in continental margin sediments
Hartnett, H., Keil, R., Hedges, J., & Devol, A. (1998) · Nature · doi:10.1038/35351 · Cited by 896
The phosphorus cycle, phosphogenesis and marine phosphate-rich deposits
Föllmi, K. B. (1996) · Earth-Science Reviews · doi:10.1016/0012-8252(95)00049-6 · Cited by 893
A New Model for Atmospheric Oxygen Over Phanerozoic Time
Berner, R. A., & Canfield, D. E. (1989) · American Journal of Science · doi:10.2475/ajs.289.4.333 · Cited by 756
Expansion of C4 ecosystems as an indicator of global ecological change in the late Miocene
Cerling, T. E., Wang, Y., & Quade, J. (1993) · Nature · doi:10.1038/361344a0 · Cited by 713
Effects of climate on chemical weathering in watersheds
White, A. F., & Blum, A. E. (2021) · Routledge eBooks · doi:10.1201/9780203734049-13 · Cited by 639
The Rise of Plants and Their Effect on Weathering and Atmospheric CO 2
Berner, R. A. (1997) · Science · doi:10.1126/science.276.5312.544 · Cited by 546
The ages of Gaia: a biography of our living earth
Lovelock, J. (1989) · Choice Reviews Online · doi:10.5860/choice.27-0285 · Cited by 543
Froelich, P. N., Bender, M. L., Luedtke, N. A., Heath, G. R., & DeVries, T. (1982) · American Journal of Science · doi:10.2475/ajs.282.4.474 · Cited by 541
Henrichs, S. M., & Reeburgh, W. S. (1987) · Geomicrobiology Journal · doi:10.1080/01490458709385971 · Cited by 531
Ingall, E., & Jahnke, R. (1994) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(94)90033-7 · Cited by 527
Sr isotope evolution of seawater: the role of tectonics
Richter, F. M., Rowley, D. B., & DePaolo, D. J. (1992) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(92)90070-c · Cited by 524
Nitrification, denitrification and nitrous oxide cycling in the eastern tropical South Pacific ocean
Codispoti, L. A., & Christensen, J. P. (1985) · Marine Chemistry · doi:10.1016/0304-4203(85)90051-9 · Cited by 518
Cappellen, P. V., & Ingall, E. (1994) · Paleoceanography · doi:10.1029/94pa01455 · Cited by 512
Ingall, E., Bustin, R., & Cappellen, P. V. (1993) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(93)90433-w · Cited by 486
Biotic enhancement of weathering and the habitability of Earth
SCHWARTZMAN, D. W., & Volk, T. (1989) · Nature · doi:10.1038/340457a0 · Cited by 443
Organic carbon burial forcing of the carbon cycle from Himalayan erosion
France‐Lanord, C., & Derry, L. A. (1997) · Nature · doi:10.1038/36324 · Cited by 442
Himalayan Tectonics, Weathering Processes, and the Strontium Isotope Record in Marine Limestones
Edmond, J. M. (1992) · Science · doi:10.1126/science.258.5088.1594 · Cited by 429
Redox Stabilization of the Atmosphere and Oceans by Phosphorus-Limited Marine Productivity
Van Cappellen, P., & Ingall, E. D. (1996) · Science · doi:10.1126/science.271.5248.493 · Cited by 412
Climates throughout geologic time
Chandler, T. J. (1980) · Sedimentary Geology · doi:10.1016/0037-0738(80)90020-2 · Cited by 373
The National fire-danger rating system /
Deeming, J. E., & Rocky Mountain Forest and Range Experiment Station (Fort Collins, C. ). (1974) · doi:10.5962/bhl.title.98707 · Cited by 348
Ingall, E., & Cappellen, P. V. (1990) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(90)90326-g · Cited by 319
The carbon cycle and carbon dioxide over Phanerozoic time: the role of land plants
Berner, R. A. (1998) · Philosophical Transactions of the Royal Society B Biological Sciences · doi:10.1098/rstb.1998.0192 · Cited by 301
Lenton, T. M. (1998) · Nature · doi:10.1038/28792 · Cited by 300
Self-citationChemical weathering of silicate rocks as a function of elevation in the southern Swiss Alps
Drever, J. I., & Zobrist, J. (1992) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(92)90298-w · Cited by 277
Redfield revisited: 1. Regulation of nitrate, phosphate, and oxygen in the ocean
Lenton, T. M., & Watson, A. J. (2000) · Global Biogeochemical Cycles · doi:10.1029/1999gb900065 · Cited by 248
Self-citationGeological Factors and the Evolution of Plants.
Matten, L. C., & Tiffney, B. H. (1986) · Bulletin of the Torrey Botanical Club · doi:10.2307/2996244 · Cited by 234
National Fire-Danger Rating System /
Deeming, J. E. (1972) · doi:10.5962/bhl.title.98933 · Cited by 205
Methanogenesis, fires and the regulation of atmospheric oxygen
Watson, A. J., Lovelock, J. E., & Margulis, L. (1978) · Biosystems · doi:10.1016/0303-2647(78)90012-6 · Cited by 202
Self-citationClimatological atlas of the world ocean
Levitus, S. (1982) · Medical Entomology and Zoology · Cited by 201
Lovelock, J. E., & Whitfield, M. (1982) · Nature · doi:10.1038/296561a0 · Cited by 186
The Himalayas, organic carbon burial, and climate in the Miocene
Raymo, M. E. (1994) · Paleoceanography · doi:10.1029/94pa00289 · Cited by 184
Reassessment of the oceanic residence time of phosphorus
Ruttenberg, K. C. (1993) · Chemical Geology · doi:10.1016/0009-2541(93)90220-d · Cited by 182
The Late Neogene 87 Sr/ 86 Sr Record of Lowland Himalayan Rivers
Quade, J., Roe, L. J., DeCelles, P. G., & Ojha, T. P. (1997) · Science · doi:10.1126/science.276.5320.1828 · Cited by 173
The record of sea water 187Os/186Os variation through the Cenozoic
Pegram, W. J., Krishnaswami, S., Ravizza, G., et al. (1992) · Earth and Planetary Science Letters · doi:10.1016/0012-821x(92)90132-f · Cited by 169
Betts, J. N., & Holland, H. D. (1991) · Global and Planetary Change · doi:10.1016/0921-8181(91)90123-e · Cited by 169
Control theory and physiological feedback mechanisms
Riggs, D. S. (1970) · Medical Entomology and Zoology · Cited by 168
Strontium-calcium ratios in Cenozoic planktonic foraminifera
Graham, D., Bender, M., Williams, D. F., & Keigwin, L. (1982) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(82)90012-6 · Cited by 160
Rapid, plant-induced weathering in an aggrading experimental ecosystem
Bormann, B. T., Wang, D., Snyder, M. C., Bormann, F., Benoit, G. J., & April, R. (1998) · Biogeochemistry · doi:10.1023/a:1006065620344 · Cited by 152
Shackleton, N. J. (1987) · Geological Society, London, Special Publications · doi:10.1144/gsl.sp.1987.026.01.27 · Cited by 147
Betts, J. N., & Holland, H. D. (1991) · Palaeogeography Palaeoclimatology Palaeoecology · doi:10.1016/0031-0182(91)90178-t · Cited by 142
Colman, A. S., & Holland, H. D. (2000) · SEPM (Society for Sedimentary Geology) eBooks · doi:10.2110/pec.00.66.0053 · Cited by 141
Neogene growth of the sedimentary organic carbon reservoir
Derry, L. A., & France‐Lanord, C. (1996) · Paleoceanography · doi:10.1029/95pa03839 · Cited by 121
Terrestrial feedback in atmospheric oxygen regulation by fire and phosphorus
Kump, L. R. (1988) · Nature · doi:10.1038/335152a0 · Cited by 115
Promotion of chemical weathering by higher plants: field observations on Hawaiian basalts
Cochran, M. F., & Berner, R. A. (1996) · Chemical Geology · doi:10.1016/s0009-2541(96)00042-3 · Cited by 106
Seasonal variability and geochemical significance of organic matter in the River Ganges, Bangladesh
Ittekkot, V., Safiullah, S., Mycke, B., et al. (1985) · Nature · doi:10.1038/317800a0 · Cited by 103
Fridovich, I. (1977) · BioScience · doi:10.2307/1297527 · Cited by 103
Charcoal Fluxes into Sediments of the North Pacific Ocean: The Cenozoic Record of Burning
Herring, J. R. (2011) · Geophysical monograph · doi:10.1029/gm032p0419 · Cited by 99
Tertiary paleoceanic chemical variability: Unintended consequences of simple geochemical models
Delaney, M. L., & Boyle, E. A. (1988) · Paleoceanography · doi:10.1029/pa003i002p00137 · Cited by 86
Berner, R. A., & Maasch, K. A. (1996) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(96)00104-4 · Cited by 79
Shemesh, A., Mortlock, R. A., & Froelich, P. N. (1989) · Paleoceanography · doi:10.1029/pa004i003p00221 · Cited by 78
Tolbert, N. E., Benker, C., & Beck, E. (1995) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.92.24.11230 · Cited by 77
Self‐beneficial effects of vegetation on climate in an ocean‐atmosphere general circulation model
Betts, R. (1999) · Geophysical Research Letters · doi:10.1029/1999gl900283 · Cited by 77
Beerling, D. J., Woodward, F. I., Lomas, M. R., Wills, M. A., Quick, W. P., & Valdes, P. J. (1998) · Philosophical Transactions of the Royal Society B Biological Sciences · doi:10.1098/rstb.1998.0196 · Cited by 67
Organic phosphorus and carbon in marine sediments
Mach, D., Ramirez, A., & Holland, H. D. (1987) · American Journal of Science · doi:10.2475/ajs.287.5.429 · Cited by 67
Stability of atmospheric oxygen
Walker, J. C. G. (1974) · American Journal of Science · doi:10.2475/ajs.274.3.193 · Cited by 65
Controls on Soil Solution Chemistry in a Subalpine Forest in North‐Central Colorado
Arthur, M. A., & Fahey, T. J. (1993) · Soil Science Society of America Journal · doi:10.2136/sssaj1993.03615995005700040040x · Cited by 62
Plant-induced weathering of Hawaiian basalts
Berner, R. A., & Cochran, M. F. (1998) · Journal of Sedimentary Research · doi:10.2110/jsr.68.723 · Cited by 59
Delaney, M. L., & Filippelli, G. M. (1994) · Paleoceanography · doi:10.1029/94pa00795 · Cited by 58
Haddad, R. I., & Martens, C. S. (1987) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(87)90372-3 · Cited by 56
Chemical Weathering in Central Iceland: An Analog of Pre-Silurian Weathering
Cawley, J. L., Burruss, R. C., & Holland, H. D. (1969) · Science · doi:10.1126/science.165.3891.391 · Cited by 55
Biotic enhancement of weathering and surface temperatures on earth since the origin of life
SCHWARTZMAN, D. W., & Volk, T. (1991) · Global and Planetary Change · doi:10.1016/0921-8181(91)90002-e · Cited by 47
Biotic enhancement of weathering and surface temperatures on earth since the origin of life
SCHWARTZMAN, D. W., & Volk, T. (1991) · Palaeogeography Palaeoclimatology Palaeoecology · doi:10.1016/s0031-0182(12)80035-6 · Cited by 47
Redox Stabilization of the Atmosphere and Oceans and Marine Productivity
Colman, A. S., Mackenzie, F. T., Holland, H. D., Cappellen, P. V., & Ingall, E. D. (1997) · Science · doi:10.1126/science.275.5298.406 · Cited by 44
Degradation of plant tissues in organic sediments
Barghoorn, E. S. (1952) · Journal of Sedimentary Research · doi:10.1306/d42694ae-2b26-11d7-8648000102c1865d · Cited by 36
The World Ocean Mechanism or Machination?
Whitfield, M. (1981) · Interdisciplinary Science Reviews · doi:10.1179/isr.1981.6.1.12 · Cited by 30
The Coupling of the Carbon and Sulfur Biogeochemical Cycles Over Phanerozoic Time
Kump, L. R. (1993) · Springer eBooks · doi:10.1007/978-3-642-76064-8_19 · Cited by 26
Caldeira, K., Arthur, M. A., Berner, R. A., et al. (1993) · Nature · doi:10.1038/361123b0 · Cited by 25
Carbon Cycle Models: How Strong Are the Constraints?
Raymo, M. E. (1997) · Springer eBooks · doi:10.1007/978-1-4615-5935-1_16 · Cited by 24
Compton, J. S., & Mallinson, D. J. (1996) · Paleoceanography · doi:10.1029/96pa00785 · Cited by 20
Volk, T. (1993) · Nature · doi:10.1038/361123a0 · Cited by 17
Duursma, E. K., & Boisson, M. (1994) · Institutional Archive of Ifremer (French Research Institute for Exploitation of the Sea) · Cited by 15
Regulation of Atmospheric O 2 : Feedback in the Microbial Feedbag
Kump, L. R., & Mackenzie, F. T. (1996) · Science · doi:10.1126/science.271.5248.459 · Cited by 13
Raymo, M. E., & Ruddiman, W. F. (1993) · Nature · doi:10.1038/361124a0 · Cited by 12
Diagenetic replacement controlled by force of crystallization
Maliva, R. G., & Siever, R. (1988) · Geology · doi:10.1130/0091-7613(1988)016
High rates of arc consumption by subduction processes: Some consequences
Lallemand, S. (1995) · Geology · doi:10.1130/0091-7613(1995)023
Research works printed but not linked: 7
- Berner R. A., 1991, Scientists on Gaia, 161
- Colman A. S., 1999, Marine Authigenesis: From Microbial to Global
- Garrels R. M., 1974, The Sea, 303
- Holland H. D. Ocean water nutrients and atmospheric oxygen Proceedings of Symposium on Hydrogeochemistry and BiogeochemistryE.Ingerson 68–81Clarke Washington D.C. 1973.
- Holland H. D., 1994, The phosphate‐oxygen connection, Eos Trans. AGU, 75, 96
- Lenton T. M. Redfield's green ocean — A geophysiological model of marine nitrate phosphate and atmospheric oxygen regulation Ph.D. thesis Univ. of East Anglia Norwich 1998b.
- Watson A. J. Consequences for the biosphere of forest and grassland fires Ph.D. thesis University of Reading Reading 1978.
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“…O2 concentrations have apparently been stabilized by a variety of feedbacks that regulate, as functions of O2 concentration, the burial and weathering rates of organic carbon and pyrite (e.g., Berner & Canfield 1989, Berner et al. 2000, Lenton & Watson 2000; see review in Berner et al. 2003).”
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Algeo, T. J., & Ingall, E. (2007) · Palaeogeography, Palaeoclimatology, Palaeoecology · doi:10.1016/j.palaeo.2007.02.029 · Cited by 769
The long-term carbon cycle, fossil fuels and atmospheric composition
Berner, R. A. (2003) · Nature · doi:10.1038/nature02131 · Cited by 659
COPSE: A new model of biogeochemical cycling over Phanerozoic time
Bergman, N. M. (2004) · American Journal of Science · doi:10.2475/ajs.304.5.397 · Cited by 599
Ruttenberg, K. C. (2003) · Treatise on Geochemistry · doi:10.1016/b0-08-043751-6/08153-6 · Cited by 541
Metadata
- Authors
- Lenton, T. M., & Watson, A. J.
- Affiliations
- University of East Anglia (GB)
- Venue
- Global Biogeochemical Cycles
- Publisher
- American Geophysical Union (AGU)
- Published
- 2000-03
- Volume
- 14
- Issue
- 1
- Pages
- 249-268
- ISSN
- 0886-6236 (ISSN-L)
- 1944-9224
- OpenAlex
- W2103585008
- Semantic Scholar
- aad3de7f8e842bc1997d2ec2c1b20fda6c4135f3
- Cited by
- 192
- References
- 94
- Citations by year
- 2026: 6 · 2025: 7 · 2024: 9 · 2023: 23 · 2022: 9 · 2021: 11 · 2020: 7 · 2019: 5 · 2018: 11 · 2017: 10 · 2016: 7 · 2015: 5 · 2014: 4 · 2013: 6 · 2012: 4
- FWCI
- 8.62
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Global Biogeochemical Cycles (publishedVersion)
- UEA Digital Repository (University of East Anglia) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Environmental Science › Global and Planetary Change › Earth Systems and Cosmic Evolution
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Keywords
- Redfield ratio, oxygenation of Earth, phosphorus cycling, denitrification, organic carbon burial, anoxia, iron phosphate, rock weathering, fire frequency, nutrient limitation, paleo-oxygenation, feedback mechanisms
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