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Departures from eustasy in Pliocene sea-level records

Abstract

Proxy data suggest that atmospheric CO2 levels during the middle of the Pliocene epoch (about 3 Myr ago) were similar to today, leading to the use of this interval as a potential analogue for future climate change. Estimates for mid-Pliocene sea levels range from 10 to 40 m above present, and a value of +25 m is often adopted in numerical climate model simulations. A eustatic change of such magnitude implies the complete deglaciation of the West Antarctic and Greenland ice sheets, and significant loss of mass in the East Antarctic ice sheet. However, the effects of glacial isostatic adjustments have not been accounted for in Pliocene sea-level reconstructions. Here we numerically model these effects on Pliocene shoreline features using a gravitationally self-consistent treatment of post-glacial sea-level change. We find that the predicted modern elevation of Pliocene shoreline features can deviate significantly from the eustatic signal, even in the absence of subsequent tectonically-driven movements of the Earth’s surface. In our simulations, this non-eustatic sea-level change, at individual locations, is caused primarily by residual isostatic adjustments associated with late Pleistocene glaciation. We conclude that a combination of model results and field observations can help to better constrain sea level in the past, and hence lend insight into the stability of ice sheets under varying climate conditions.

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Figure 1: Stack of globally distributed benthic δ18O records21 showing pattern of climate variability over past 5 Myr.
Figure 2: Elevation (m), relative to modern SL, of a shoreline indicator deposited at 2.95 Myr predicted using the VM2 Earth model.
Figure 3: Elevation (m), relative to modern SL, of a shoreline indicator deposited at 2.95 Myr predicted using the LM Earth model.
Figure 4: Elevation (m) predictions for the east coast of the US and Mexico as in Figs 2a and 3a.
Figure 5: Elevation (m), relative to modern SL, of a shoreline indicator deposited at 2.95 Myr, highlighting those regions where palaeoshorelines would lie within ±4 m of the predicted eustatic SL, as in Figs 2a and 3a.

References

  1. Intergovernmental Panel on Climate Change Fourth Assessment Report available at: http://www.ipcc.ch/ipccreports/ar4-syr.htm (2007).

  2. Haywood, A. M., Valdes, P. J. & Sellwood, B. W. Global scale palaeoclimate reconstruction of the middle Pliocene climate using the UKMO GCM: Initial results. Glob. Planet. Change 25, 239–256 (2000).

    Article  Google Scholar 

  3. Haywood, A. M. & Valdes, P. J. Modelling Middle Pliocene warmth: Contribution of atmosphere, oceans and cryosphere. Earth Planet. Sci. Lett. 218, 363–377 (2004).

    Article  Google Scholar 

  4. Chandler, M., Rind, D. & Thompson, R. Joint investigations of the Middle Pliocene climate II: GISS GCM Northern Hemisphere results. Glob. Planet. Change 9, 197–219 (1994).

    Article  Google Scholar 

  5. Sloan, L. C., Crowley, T. J. & Pollard, D. Modelling of Middle Pliocene climate with the NCAR GENESIS general circulation model. Mar. Micropaleontol. 27, 51–61 (1996).

    Article  Google Scholar 

  6. Pagani, M., Liu, Z., LaRiveire, J. & Ravelo, A. C. High Earth-system climate sensitivity determined from Pliocene carbon dioxide concentrations. Nature Geosci. 3, 27–30 (2010).

    Article  Google Scholar 

  7. Dowsett, H. J. in Deep-time Perspectives on Climate Change: Marrying the Signal from Computer Models and Biological Proxies (eds Williams, M., Haywood, A. M., Gregory, J. & Schmidt, D.) 459–480 (The Micropalaeontological Society Special Publications The Geological Society of London, 2007).

    Book  Google Scholar 

  8. Pollard, D. & De Conto, R. M. Modelling West Antarctic ice sheet growth and collapse through the past five million years. Nature 458, 329–332 (2009).

    Article  Google Scholar 

  9. Moucha, R., Forte, A. M., Mitrovica, J. X., Rowley, D. B & Quéré, S. Dynamic topography and long-term sea-level variations: There is no such thing as a stable continental platform. Earth Planet. Sci. Lett. 271, 101–108 (2008).

    Article  Google Scholar 

  10. Farrell, W. E. & Clark, J. A. On postglacial sea level. Geophys. J. R. Astron. Soc. 46, 647–667 (1976).

    Article  Google Scholar 

  11. Mitrovica, J. X. & Milne, G. A. On post-glacial sea level. I. General theory. Geophys. J. Int. 154, 253–267 (2003).

    Article  Google Scholar 

  12. Kendall, R. A., Mitrovica, J. X. & Milne, G. A. On post-glacial sea level: II. Numerical formulation and comparative results on spherically symmetric models. Geophys. J. Int. 161, 679–706 (2005).

    Article  Google Scholar 

  13. Mitrovica, J. X., Wahr, J., Matsuyama, I. & Paulson, A. The rotational stability of an ice age Earth. Geophys. J. Int. 161, 491–506 (2005).

    Article  Google Scholar 

  14. Mitrovica, J. X. Recent controversies in predicting post-glacial sea-level change: A viewpoint. Quat. Sci. Rev. 22, 127–133 (2003).

    Article  Google Scholar 

  15. Lambeck, K. & Chappell, J. Sea level change through the last glacial cycle. Science 292, 679–686 (2001).

    Article  Google Scholar 

  16. Kopp, R. E., Frederik, S. J., Mitrovica, J. X., Maloof, A. C. & Oppenheimer, M. Probabilistic assessment of sea level during the last interglacial stage. Nature 462, 863–868 (2009).

    Article  Google Scholar 

  17. Dziewonski, A. M. & Anderson, D. L. Preliminary reference Earth model (PREM). Phys. Earth Planet. Int. 25, 297–356 (1981).

    Article  Google Scholar 

  18. Peltier, W. R. Global glacial isostasy and the surface of the ice-age Earth: The ICE-5G (VM2) model and GRACE. Annu. Rev. Earth Planet. Sci. 32, 111–149 (2004).

    Article  Google Scholar 

  19. Lambeck, K., Smither, C. & Johnston, P. Sea-level change, glacial rebound and mantle viscosity for northern Europe. Geophys. J. Int. 134, 102–144 (1998).

    Article  Google Scholar 

  20. Mitrovica, J. X. & Forte, A. M. A new inference of mantle viscosity based on a joint inversion of convection and glacial isostatic adjustment data. Earth Planet. Sci. Lett. 225, 177–189 (2004).

    Article  Google Scholar 

  21. Lisiecki, L. E. & Raymo, M. E. A Pliocene–Pleistocene stack of 57 globally distributed benthic δ18O records. Paleoceanography 20, PA1003 (2005).

    Google Scholar 

  22. Bamber, J. L., Layberry, R. L. & Gogineni, S. P. A new ice thickness and bed data set for the Greenland ice sheet; 1. Measurement, data reduction, and errors. J. Geophys. Res. 106, 33773–33780 (2001).

    Article  Google Scholar 

  23. Lythe, M. B. & Vaughan, D. G. The BEDMAP Consortium, BEDMAP: A new ice thickness and subglacial topographic model of Antarctica. J. Geophys. Res. 106, 11335–11351 (2001).

    Article  Google Scholar 

  24. Mitrovica, J. X. & Milne, G. A. On the origin of postglacial ocean syphoning. Quat. Sci. Rev. 21, 2179–2190 (2002).

    Article  Google Scholar 

  25. Kaufman, D. S. & Brigham-Grette, J. Aminostratigraphic correlations and paleotemperature implications, Pliocene–Pleistocene high-sea-level deposits, northwestern Alaska. Quat. Sci. Rev. 12, 21–33 (1993).

    Article  Google Scholar 

  26. Dowsett, H. J. & Cronin, T. M. High eustatic sea level during the middle Pliocene: Evidence from the southeastern US Atlantic Coastal Plain. Geology 18, 435–438 (1990).

    Article  Google Scholar 

  27. Krantz, D. E. A chronology of Pliocene sea-level fluctuations: The US Middle Atlantic coastal plain record. Quat. Sci. Rev. 10, 163–174 (1991).

    Article  Google Scholar 

  28. Wardlaw, B. R. & Quinn, T. M. The record of Pliocene sea-level change at Enewetak Atoll. Quat. Sci. Rev. 10, 247–258 (1991).

    Article  Google Scholar 

  29. James, N. P., Bone, Y., Carter, R. M. & Murray-Wallace, C. V. Origin of the late Neogene Roe Plains and their calcarenite veneer: Implications for sedimentology and tectonics in the Great Australian Bight. Aust. J. Earth Sci. 53, 407–419 (2006).

    Article  Google Scholar 

  30. Sandiford, M. & Quigley, M. TOPO-OZ: Insights into the various modes of intraplate deformation in the Australian continent. Tectonophysics 474, 405–416 (2009).

    Article  Google Scholar 

  31. Dahlen, F. A. The passive influence of the oceans on the rotation of the Earth. Geophys. J. R. Astron. Soc. 46, 363–406 (1976).

    Article  Google Scholar 

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Acknowledgements

Support for this research was provided by NSF-OCE0825293 to M.E.R. and by Harvard University and The Canadian Institute for Advanced Research to J.X.M. We thank T. Cronin and J. Brigham-Grette for discussions of field data and support from the USGS PRISM program that helped jump-start this investigation.

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M.E.R. and J.X.M. jointly conceived and designed the GIA model experiments and wrote first draft of paper; J.X.M. carried out the GIA experiments; R.M.D. provided ice sheet simulations; M.J.O. and P.J.H. contributed to analysis of geologic data; all authors contributed to discussions and revisions of the manuscript.

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Correspondence to Maureen E. Raymo.

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Raymo, M., Mitrovica, J., O’Leary, M. et al. Departures from eustasy in Pliocene sea-level records. Nature Geosci 4, 328–332 (2011). https://doi.org/10.1038/ngeo1118

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