Reconstructing
This presentation is the property of its rightful owner.
Sponsored Links
1 / 25

Reconstructing middle Miocene tectonic boundary conditions PowerPoint PPT Presentation


  • 91 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

Reconstructing middle Miocene tectonic boundary conditions

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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)


Reconstructing the oceans

Reconstructing the oceans


Age distribution at 15 ma

Age distribution at 15 Ma


Age converted to depth

Age converted to depth


Depth error based on age

Depth error based on age


Sediment thickness

Sediment thickness

Global modern sediment thickness:

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


Predicted sediment thickness 15 ma

Predicted sediment thickness 15 Ma


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


Mediterranean

Mediterranean


Reconstructing miocene palaeogeography is it worth it

Reconstructing Miocene palaeogeography – is it worth it?

?


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


Mean annual surface temperature

Mean annual surface temperature


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.


Reconstructing middle miocene tectonic boundary conditions

Kearey and Vine, 1996


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.


  • Login