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Reconstructing middle Miocene tectonic boundary conditions

Reconstructing middle Miocene tectonic boundary conditions. Nicholas Herold, Seton, M., Müller , R. D. and You., J. University of Cambridge 11 th August, 2008. This talk. Part 1. Reconstructing the oceans Part 2. Reconstructing topography

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Reconstructing middle Miocene tectonic boundary conditions

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  1. Reconstructing middle Miocene tectonic boundary conditions Nicholas Herold, Seton, M., Müller, R. D. and You., J. University of Cambridge 11th August, 2008

  2. This talk... Part 1. Reconstructing the oceans Part 2. Reconstructing topography Part 3. Reconstructing middle Miocene palaeogeography – is it worth it? Part 4. Combining palaeogeography with other model boundary conditions

  3. Why the Miocene? Miocene Climatic Optimum (MCO) TIME (Ma) Zachos et al. (2001)

  4. Reconstructing the oceans

  5. Age distribution at 15 Ma

  6. Age converted to depth

  7. Depth error based on age

  8. Sediment thickness Global modern sediment thickness: http://www.ngdc.noaa.gov/mgg/sedthick/sedthick.html

  9. Predicted sediment thickness 15 Ma

  10. Large igneous provinces (LIPs) With surrounding seafloor Without surrounding seafloor

  11. Bathymetric reconstruction Age converted depth Age Sediment thickness LIPS

  12. Topography/bathymetry MIOCENE MODERN

  13. Adjustments for climate models Narrow gateways Marginal seas

  14. Mediterranean

  15. Reconstructing Miocene palaeogeography – is it worth it? ?

  16. General Circulation Model • NCAR Community Atmosphere Model and Community Land Model. • ~3.75° x 3.75° horizontal resolution, 26 atmospheric layers. atm lnd ice cpl ocn

  17. Combining palaeogeography with other boundary conditions • Other boundary conditions • - Greenhouse gases • - Orbital parameters • Solar constant • River Transport

  18. Mean annual surface temperature

  19. Model-data temperature discrepancies Mean discrepancy: -1.7°C

  20. Model-data precipitation discrepancies Mean discrepancy: -172 mm/year

  21. In summary • New Miocene palaeogeography. • Preliminary results of a Miocene climate simulation: too cool and arid compared to proxy data. • Need to run coupled climate simulations using new palaeogeography in order to better resolve and understand proxy-model discrepancies.

  22. Thanks... • Müller, R.D., Sdrolias, M., Gaina, C. and Roest, W.R., 2008. Age, spreading rates and spreading asymmetry of the world's ocean crust. Geochemistry, Geophysics, Geosystems.: Q04006. • Müller, R.D., Sdrolias, M., Gaina C., Steinberger B. and C., H., 2008. Long-Term Sea-Level Fluctuations Driven by Ocean Basin Dynamics. Science, 319(5868): 1357-1362.

  23. Kearey and Vine, 1996

  24. Annual zonal mean sea surface temperature

  25. References • Stampfli, G.M. and Borel, G.D., 2002. A plate tectonic model for the Paleozoic and Mesozoic constrained by dynamic plate boundaries and restored synthetic oceanic isochrons. Earth and Planetary Science Letters, 196(1-2): 17-33.

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