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Carbon dioxide forcing alone insufficient to explain Palaeocene–Eocene Thermal Maximum warming

Abstract

The Palaeocene–Eocene Thermal Maximum (about 55 Myr ago) represents a possible analogue for the future and thus may provide insight into climate system sensitivity and feedbacks1,2. The key feature of this event is the release of a large mass of 13C-depleted carbon into the carbon reservoirs at the Earth’s surface, although the source remains an open issue3,4. Concurrently, global surface temperatures rose by 5–9 C within a few thousand years5,6,7,8,9. Here we use published palaeorecords of deep-sea carbonate dissolution10,11,12,13,14 and stable carbon isotope composition10,15,16,17 along with a carbon cycle model to constrain the initial carbon pulse to a magnitude of 3,000 Pg C or less, with an isotopic composition lighter than −50‰. As a result, atmospheric carbon dioxide concentrations increased during the main event by less than about 70% compared with pre-event levels. At accepted values for the climate sensitivity to a doubling of the atmospheric CO2 concentration1, this rise in CO2 can explain only between 1 and 3.5 C of the warming inferred from proxy records. We conclude that in addition to direct CO2 forcing, other processes and/or feedbacks that are hitherto unknown must have caused a substantial portion of the warming during the Palaeocene–Eocene Thermal Maximum. Once these processes have been identified, their potential effect on future climate change needs to be taken into account.

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Figure 1: PETM model simulations and palaeorecords.
Figure 2: Simulated CCD shoaling.
Figure 3: Deep-sea carbonate ion basin gradient during the PETM.
Figure 4: Simulated atmospheric CO2 during the main event.

References

  1. IPCC. Climate Change 2007: The Physical Science Basis (eds Solomon, S., et al.) (Cambridge Univ. Press, 2007).

  2. Zachos, J. C., Dickens, G. R. & Zeebe, R. E. An early Cenozoic perspective on greenhouse warming and carbon-cycle dynamics. Nature 451, 279–283 (2008).

    Article  Google Scholar 

  3. Dickens, G. R. Methane oxidation during the late Palaeocene Thermal Maximum. Bull. Soc. Geol. Fr. 171, 37–49 (2000).

    Google Scholar 

  4. Pagani, M., Calderia, K., Archer, D. & Zachos, J. C. An ancient carbon mystery. Science 314, 1556–1557 (2006).

    Article  Google Scholar 

  5. Kennett, J. P. & Stott, L. D. Abrupt deep-sea warming, palaeoceanographic changes and benthic extinctions at the end of the Palaeocene. Nature 353, 225–229 (1991).

    Article  Google Scholar 

  6. Zachos, J. C. et al. A transient rise in tropical sea surface temperature during the Paleocene–Eocene Thermal Maximum. Science 302, 1551–1554 (2003).

    Article  Google Scholar 

  7. Tripati, A. & Elderfield, H. Deep-sea temperature and circulation changes at the Paleocene–Eocene Thermal Maximum. Science 308, 1894–1898 (2005).

    Article  Google Scholar 

  8. Zachos, J. C. et al. Extreme warming of mid-latitude coastal ocean during the Paleocene–Eocene Thermal Maximum: Inferences from TEX86 and isotope data. Geology 34, 737–740 (2006).

    Article  Google Scholar 

  9. Sluijs, A. et al. Subtropical Arctic Ocean temperatures during the Palaeocene/Eocene Thermal Maximum. Nature 441, 610–613 (2006).

    Article  Google Scholar 

  10. Zachos, J. C. et al. Rapid acidification of the ocean during the Paleocene–Eocene Thermal Maximum. Science 308, 1611–1615 (2005).

    Article  Google Scholar 

  11. Lyle, M., Wilson, P. A. & Janecek, T. R. Leg 199 summary. Proc. ODP Init. Rep. 199, 1–87 (2002).

    Google Scholar 

  12. Farley, K. A. & Eltgroth, S. F. An alternative age model for the Paleocene–Eocene Thermal Maximum using extraterrestrial 3He. Earth Planet Sci. Lett. 208, 135–148 (2003).

    Article  Google Scholar 

  13. Colosimo, A. B., Bralower, T. J. & Zachos, J. C. in Proc. ODP, Sci. Results Vol. 198 (eds Bralower, T. J., Premoli Silva, I. & Malone, M. J.) (Texas A&M Univ., 2005).

    Google Scholar 

  14. Murphy, B., Lyle, M. & Lyle, A. O. in Proc. ODP, Sci. Res. (eds Wilson, P. A., Lyle, M. & Firth, J. V.) 1–12 (Texas A&M Univ., 2006).

    Google Scholar 

  15. Thomas, D. J. et al. Warming the fuel for the fire: Evidence for the thermal dissociation of methane hydrate during the Paleocene–Eocene Thermal Maximum. Geology 30, 1067–1070 (2002).

    Article  Google Scholar 

  16. Nunes, F. & Norris, R. D. Abrupt reversal in ocean overturning during the Palaeocene/Eocene warm period. Nature 439, 60–63 (2006).

    Article  Google Scholar 

  17. Röhl, U., Westerhold, T., Bralower, T. J. & Zachos, J. C. On the duration of the Paleocene–Eocene Thermal Maximum (PETM). Geochem. Geophys. Geosyst. 8, Q12002 (2007).

    Article  Google Scholar 

  18. Zeebe, R. E. & Zachos, J. C. Reversed deep-sea carbonate ion basin-gradient during Paleocene–Eocene Thermal Maximum. Paleoceanography 22, PA3201 (2007).

    Article  Google Scholar 

  19. Dickens, G. R., O’Neil, J. R., Rea, D. K. & Owen, R. M. Dissociation of oceanic methane hydrate as a cause of the carbon isotope excursion at the end of the Paleocene. Paleoceanography 10, 965–971 (1995).

    Article  Google Scholar 

  20. Zeebe, R. E., Zachos, J. C., Caldeira, K. & Tyrrell, T. Oceans: Carbon emissions and acidification. Science 321, 51–52 (2008).

    Article  Google Scholar 

  21. Dickens, G. R. Carbon addition and removal during the Late Palaeocene Thermal Maximum: Basic theory with a preliminary treatment of the isotope record at ODP Site 1051, Blake Nose. Geol. Soc. Lond. Spec. Publ. 183, 293–305 (2001).

    Article  Google Scholar 

  22. Bowen, G. J. et al. A humid climate state during the Paleocene–Eocene Thermal Maximum. Nature 432, 495–499 (2004).

    Article  Google Scholar 

  23. van Andel, T. H. Mesozoic/Cenozoic calcite compensation depth and the global distribution of calcareous sediments. Earth Planet. Sci. Lett. 26, 187–194 (1975).

    Article  Google Scholar 

  24. Tyrrell, T. & Zeebe, R. E. History of carbonate ion concentration over the last 100 million years. Geochim. Cosmochim. Acta 68, 3521–3530 (2004).

    Article  Google Scholar 

  25. Panchuk, K., Ridgwell, A. & Kump, L. R. Sedimentary response to Paleocene–Eocene Thermal Maximum carbon release: A model-data comparison. Geology 36, 315–318 (2008).

    Article  Google Scholar 

  26. Bice, K. L. & Marotzke, J. Could changing ocean circulation have destabilized methane hydrate at the Paleocene/Eocene boundary? Paleoceanography 17, 1018 (2002).

    Google Scholar 

  27. Dickens, G. R. Rethinking the global carbon cycle with a large, dynamic and microbially mediated gas hydrate capacitor. Earth Planet. Sci. Lett. 213, 169–183 (2003).

    Article  Google Scholar 

  28. Sloan, L. C. et al. Possible methane-induced polar warming in the early Eocene. Nature 357, 320–322 (1992).

    Article  Google Scholar 

  29. Röhl, U., Bralower, T. J., Norris, R. D. & Wefer, G. New chronology for the late Paleocene thermal maximum and its environmental implications. Geology 28, 927–930 (2000).

    Article  Google Scholar 

  30. Marland, G., Boden, T. A. & Andres, R. J. Global, Regional, and National CO2 Emissions (CDIAC, ORNL, US DOE, 2007).

    Google Scholar 

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Acknowledgements

The research was supported by NSF grant EAR06-28719 to J.C.Z. and EAR06-28394 to R.E.Z.

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Correspondence to Richard E. Zeebe.

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Zeebe, R., Zachos, J. & Dickens, G. Carbon dioxide forcing alone insufficient to explain Palaeocene–Eocene Thermal Maximum warming. Nature Geosci 2, 576–580 (2009). https://doi.org/10.1038/ngeo578

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