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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

Reconstructing middle Miocene tectonic boundary conditions

Nicholas Herold, Seton, M., Müller, R. D. and You., J.

University of Cambridge

11th August, 2008


This talk
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


Why the miocene
Why the Miocene?

Miocene Climatic Optimum (MCO)

TIME (Ma)

Zachos et al. (2001)






Sediment thickness
Sediment thickness

Global modern sediment thickness:

http://www.ngdc.noaa.gov/mgg/sedthick/sedthick.html



Large igneous provinces lips
Large igneous provinces (LIPs)

With surrounding seafloor

Without surrounding seafloor


Bathymetric reconstruction
Bathymetric reconstruction

Age converted depth

Age

Sediment thickness

LIPS


Topography bathymetry
Topography/bathymetry

MIOCENE

MODERN


Adjustments for climate models
Adjustments for climate models

Narrow gateways

Marginal seas




General circulation model
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


Combining palaeogeography with other boundary conditions
Combining palaeogeography with other boundary conditions

  • Other boundary conditions

  • - Greenhouse gases

  • - Orbital parameters

  • Solar constant

  • River Transport



Model data temperature discrepancies
Model-data temperature discrepancies

Mean discrepancy: -1.7°C


Model data precipitation discrepancies
Model-data precipitation discrepancies

Mean discrepancy: -172 mm/year


In summary
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.


Thanks
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.



Annual zonal mean sea surface temperature
Annual zonal mean sea surface temperature


References
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.