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Group E: Mixing aka

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Kari Cooper, UC Davis, Amber Harris, Rhode Island, Stan Hart, Woods Hole, Louise ... Understand the relationship between scales of convection and scales of mixing ... – PowerPoint PPT presentation

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Title: Group E: Mixing aka


1
Group E Mixing aka Progress towards Chaos
  • Kari Cooper, UC Davis, Amber Harris, Rhode
    Island, Stan Hart, Woods Hole, Louise Kellogg, UC
    Davis, Julie Prytulak, U. Bristol, Elizabeth
    Vanacore, Rice U.
  • With help from John Naliboff, UCDavis/U.
    Michigan, Natarajan Conjeepuram, UC Davis, Sujoy
    Mukhopadhyay, Harvard, Magali Billen, UCD
  • Goals
  • Understand the relationship between scales of
    convection and scales of mixing
  • Determine whether factors that produce layered
    structures influence mixing
  • Assess the influence of length scales on stirring
    and mixing
  • Methods Analyze previously calculated convection
    models with tracers and variable viscosity
  • Calculate the power spectra for temperature
    fields
  • Compare with rates of mixing of passive tracers
  • Examine effect of property change in lower mantle

2
The models
  • Temperature and pressure-dependent viscosity
  • 2-D, aspect ratio 10x1
  • Ra 1e7 (defined by reference properties)
  • Internal heating (about 2/3) and basal heating
    (about 1/3)
  • Models run past initial transient before
    particles introduced
  • Power spectra calculated using Matlab
  • Models previously calculated using ConMan
    particles
  • Unlayered Model No discontinuous change in
    properties across the mid-mantle
  • Layered Model Factor of 5 increase in
    viscosity thermal conductivity at the midpoint
    (depth).

3
Unlayered model
4
Similar results from spherical dynamical models
and seismic The power is concentrated in low
degrees and in the boundary layers
5
Unlayered model
6
Unlayered vs. layered
7
Unlayered 1D line
8
Layered 1 D line
9
Where do we go from here?
  • Quantitative analysis of the particles does the
    mixing depend on wavelength?
  • Interpretation for geochemistry

10
Particles illustrate mixing
Unlayered model
11
Unlayered model
12
Unlayered model
13
Unlayered model
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