The relationship between atmospheric carbon dioxide (CO2) and climate in the Quaternary period has been extensively investigated, but the role of CO2 in temperature changes during the rest of Earth’s history is less clear1. The range of geological evidence for cool periods during the high CO2 Mesozoic ‘greenhouse world’2,3 of high atmospheric CO2 concentrations, indicated by models4 and fossil soils5, has been particularly difficult to interpret. Here, we present high-resolution records of Mesozoic and early Cenozoic atmospheric CO2 concentrations from a combination of carbon-isotope analyses of non-vascular plant (bryophyte) fossils and theoretical modelling6,7. These records indicate that atmospheric CO2 rose from ∼420 p.p.m.v. in the Triassic period (about 200 million years ago) to a peak of ∼1,130 p.p.m.v. in the Middle Cretaceous (about 100 million years ago). Atmospheric CO2 levels then declined to ∼680 p.p.m.v. by 60 million years ago. Time-series comparisons show that these variations coincide with large Mesozoic climate shifts8,9,10, in contrast to earlier suggestions of climate–CO2 decoupling during this interval1. These reconstructed atmospheric CO2 concentrations drop below the simulated threshold for the initiation of glaciations11 on several occasions and therefore help explain the occurrence of cold intervals in a ‘greenhouse world’3.
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Veizer, J., Godderis, Y. & François, L. M. Evidence for decoupling of atmospheric CO2 and global climate during the Phanerozoic eon. Nature 408, 698–701 (2000).
Royer, D. L., Berner, R. A., Montanez, I., Tabor, N. J. & Beerling, D. J. CO2 as a primary driver of Phanerozoic climate change. GSA Today 14, 4–10 (2004).
Royer, D. L. CO2-forced climate thresholds during the Phanerozoic. Geochim. Cosmochim. Acta 70, 5665–5675 (2006).
Berner, R. A. The Phanerozoic Carbon Cycle (Oxford Univ. Press, Oxford, 2004).
Ekart, D. D., Cerling, T. E., Montañez, I. P. & Tabor, N. J. A 400 million year carbon isotope record of pedogenic carbonate: implications for paleoatmospheric carbon dioxide. Am. J. Sci. 299, 805–827 (1999).
Fletcher, B. J., Beerling, D. J., Brentnall, S. J. & Royer, D. L. Fossil bryophytes as recorders of ancient CO2 levels: Experimental evidence and a Cretaceous case study. Global Biogeochem. Cycles 19, (2005) (doi:10.1029/2005GB002495).
Fletcher, B. J., Brentnall, S. J., Quick, W. P. & Beerling, D. J. BRYOCARB: A process-based model of thallose liverwort carbon isotope fractionation in response to CO2, O2, light and temperature. Geochim. Cosmochim. Acta 70, 5676–5691 (2006).
Dromart, G. et al. Ice age at the Middle-Late Jurassic transition? Earth Planet. Sci. Lett. 213, 205–220 (2003).
Wilson, P. A., Norris, R. D. & Cooper, M. J. Testing the Cretaceous greenhouse hypothesis using glassy foramineral calcite from the core of the Turonian tropics on Demerara Rise. Geology 30, 607–610 (2002).
Shouten, S. et al. Extremely high sea-surface temperatures at low latitudes during the middle Cretaceous as revealed by archeal membrane lipids. Geology 31, 1069–1072 (2003).
DeConto, R. M. & Pollard, D. Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2 . Nature 421, 245–249 (2003).
Retallack, G. J. A 300-million-year record of atmospheric carbon dioxide from fossil plant cuticles. Nature 411, 287–290 (2001).
Kump, L. R. Reducing uncertainty about carbon dioxide as a climate driver. Nature 419, 188–190 (2002).
Freeman, K. H. & Hayes, J. M. Fractionation of carbon isotopes by phytoplankton and estimates of ancient CO2 levels. Global Biogeochem. Cycles 6, 185–198 (1992).
White, J. W. C., Ciais, P., Figge, R. A., Kenny, R. & Markgraf, V. A high-resolution record of atmospheric CO2 content from carbon isotopes in peat. Nature 367, 153–156 (1994).
Ridgwell, A. A mid Mesozoic revolution in the regulation of ocean chemistry. Mar. Geol. 217, 339–357 (2005).
Roche, D. M., Donnadieu, Y., Pucéat, E. & Paillard, D. Effects of changes in δ18O content of the surface ocean on estimated sea surface temperatures in past warm climates. Paleoceanography 21, (2006) (doi:10.1029/2005PA001220).
Berner, R. A. GEOCARBSULF: A combined model for Phanerozoic atmospheric O2 and CO2 . Geochim. Cosmochim. Acta 70, 5653–5664 (2006).
Dessert, C., Dupre, B., Gaillardet, J., Francios, L. M. & Allegre, C. J. Basalt weathering laws and the impact of basalt weathering on the global carbon. Chem. Geol. 202, 257–273 (2003).
Taylor, A. S. Chemical Weathering Rates and Sr Isotopes. Thesis, Yale Univ., New Haven (2000).
Berner, R. A. Inclusion of the weathering of volcanic rocks in the GEOCARBSULF model. Am. J. Sci. 306, 295–302 (2006).
Wallmann, K. Impact of atmospheric CO2 and galactic cosmic radiation on Phanerozoic climate change and the marine δ18O record. Geochem. Geophys. Geosyst. 5, (2004) (doi:10.1029/2003GC000683).
Siegenthaler, U. et al. Stable carbon cycle-climate relationship during the late Pleistocene. Science 310, 1313–1317 (2005).
Ramsay, J. O. & Silverman, B. W. Functional Data Analysis 2nd edn (Springer, New York, 2005).
Silverman, B. W. Density Estimation for Statistics and Data Analysis (Chapman & Hall, London, 1986).
Beerling, D. J. & Woodward, F. I. Vegetation and the Terrestrial Carbon Cycle. Modelling the First 400 Million Years (Cambridge Univ. Press, Cambridge, 2001).
Gradstein, F., Ogg, J. & Smith, A. A Geologic Timescale 2004 (Cambridge Univ. Press, Cambridge, 2004).
Oostendorp, C. The Bryophytes of the Palaeozoic and Mesozoic (J. Cramer, Berlin, 1987).
Veizer, J. et al. 87Sr/86Sr, δ13C and δ18O evolution of Phanerozoic seawater. Chem. Geol. 161, 59–88 (1999).
Katz, M. E. et al. Biological overprint of the geological carbon cycle. Mar. Geol. 217, 323–338 (2005).
We thank H. Elderfield, D. Royer, P. Wilson and I. Woodward for helpful comments, M. Katz for the δ13Ccarb data sets, A. Ridgwell for the pH-corrected δ18O data sets and H. Walker for stable-carbon-isotope analyses. We also thank the following for kindly providing fossil materials for isotopic analysis: A. Herman and V. Krassilov (Russian Academy of Sciences, Moscow), S. Wing and J. Wingerath (Smithsonian Institution, Washington), I. Daniel (University of Canterbury, Christchurch, New Zealand), A. Crame (British Antarctic Survey, Cambridge), P. Kenrick (Natural History Museum, London), W. G. Chaloner (University of London), D. Royer (Wesleyan University), J. McElwain (Trinity College, University of Dublin) and J. Francis (University of Leeds), who also provided Fig. 1d. We gratefully acknowledge financial support of this research through a University of Sheffield studentship to B.J.F., a University of Sheffield Divisional Directors award and a Leverhulme Trust award to D.J.B., and a DOE grant to R.A.B.
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Fletcher, B., Brentnall, S., Anderson, C. et al. Atmospheric carbon dioxide linked with Mesozoic and early Cenozoic climate change. Nature Geosci 1, 43–48 (2008). https://doi.org/10.1038/ngeo.2007.29
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