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Modeling Air Movement in the Firn at WAIS-D. Mark Battle Bowdoin College. WAIS-D meeting NICL July 16, 2006. Possible firn modeling strategies:. Forward model, diffusion only ( Schwander etc. ) Inverse model, diffusion only ( Butler et al.1999)

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Modeling air movement in the firn at wais d

Modeling Air Movementin the Firn at WAIS-D

Mark Battle

Bowdoin College

WAIS-D meeting

NICL

July 16, 2006


Possible firn modeling strategies
Possible firn modeling strategies:

  • Forward model, diffusion only (Schwander etc.)

  • Inverse model, diffusion only (Butler et al.1999)

  • Inverse model, diffusion only, a’la Rommelaire

  • Forward model, diffusion & heat (Severinghaus et al. 2000 )

  • Forward model, diffusion & close-off fractionation (Severinghaus & Battle, 2005 )

  • Other approaches?


Possible firn modeling strategies1
Possible firn modeling strategies:

  • Forward model, diffusion only(Schwander etc.)

  • Inverse model, diffusion only (Butler et al.1999)

  • Inverse model, diffusion only, a’la Rommelaire

  • Forward model, diffusion & heat (Severinghaus et al. 2000 )

  • Forward model, diffusion & close-off fractionation (Severinghaus & Battle, 2005 )

  • Other approaches?


Forward model diffusion only what are its virtues
Forward model, diffusion onlyWhat are its virtues?

  • Simple

  • Good reality check

  • Can determine age profile vs. depth


Forward model diffusion only overview
Forward model, diffusion onlyOverview

Measured density profile


Forward model diffusion only overview1
Forward model, diffusion onlyOverview

Measured density profile

Calculate porosity and diffusivity


Forward model diffusion only overview2
Forward model, diffusion onlyOverview

Measured density profile

Calculate porosity and diffusivity

Tune diffusivity until one species’ observations are reproduced


Forward model diffusion only overview3
Forward model, diffusion onlyOverview

Measured density profile

Calculate porosity and diffusivity

Tune diffusivity until one species’ observations are reproduced

Confirm(?) with other species


Forward model diffusion only overview4
Forward model, diffusion onlyOverview

Measured density profile

Calculate porosity and diffusivity

Tune diffusivity until one species’ observations are reproduced

Confirm(?) with other species

Use it
















Summary of basic forward model
Summary of basic forward model:

  • No big surprises!!!


Summary of basic forward model1
Summary of basic forward model:

  • No big surprises!!!

  • Density-based diffusivity requires only minor tweaking


Summary of basic forward model2
Summary of basic forward model:

  • No big surprises!!!

  • Density-based diffusivity requires only minor tweaking

  • XX vs. depth looks generally good for wide range of histories


Summary of basic forward model3
Summary of basic forward model:

  • No big surprises!!!

  • Density-based diffusivity requires only minor tweaking

  • XX vs. depth looks generally good for wide range of histories

  • “Gravitational” correction needs more data


Summary of basic forward model4
Summary of basic forward model:

  • No big surprises!!!

  • Density-based diffusivity requires only minor tweaking

  • XX vs. depth looks generally good for wide range of histories

  • “Gravitational” correction needs more data

  • DCH3CCl3/DCO2 consistent with SPO


Summary of basic forward model5
Summary of basic forward model:

  • No big surprises!!!

  • Density-based diffusivity requires only minor tweaking

  • XX vs. depth looks generally good for wide range of histories

  • “Gravitational” correction needs more data

  • DCH3CCl3/DCO2 consistent with SPO

  • DF11/DCO2 consistent with theory (and not SPO)


Summary of basic forward model6
Summary of basic forward model:

  • No big surprises!!!

  • Density-based diffusivity requires only minor tweaking

  • XX vs. depth looks generally good for wide range of histories

  • “Gravitational” correction needs more data

  • DCH3CCl3/DCO2 consistent with SPO

  • DF11/DCO2 consistent with theory (and not SPO)

  • Timing of forcing history crucial (e.g. HFC134a)


Summary of basic forward model7
Summary of basic forward model:

  • No big surprises!!!

  • Density-based diffusivity requires only minor tweaking

  • XX vs. depth looks generally good for wide range of histories

  • “Gravitational” correction needs more data

  • DCH3CCl3/DCO2 consistent with SPO

  • DF11/DCO2 consistent with theory (and not SPO)

  • Timing of forcing history crucial (e.g. HFC134a)

  • Ready to roll…


Where to next
Where to next?

  • Characterizing age spread by depth


Where to next1
Where to next?

  • Characterizing age spread by depth

  • You tell me…


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