Last Deglaciation Core Experiment Design

Contacts: Ruža Ivanović, Lauren Gregoire, Didier Roche

Go back to the main working group page.
Please note, this page is a work in progress and is not ready for discussion yet.

Proposal

Following wide consultation over the past year, this is our first-draft proposal for the last deglaciation core simulation.
Please use the Discussion section below to comment on general aspects of the proposal and make suggestions for amendments.
For comments on specific boundary conditions, please use the Discussion sections on their dedicated pages:

orbital parameters page

greenhouse gases page

ice sheets page

ice meltwater fluxes [to the ocean] page

21-9 ka

All core simulations must span this time-period. Use:

A spun-up LGM climate simulation to initialise the simulation.
This should have been set up as per the Last Glacial Maximum (LGM) working group requirements and recommendations.

Orbital parameters as per Berger & Loutre (1991)[1].

Greenhouse gases:

CO2 from Lüthi et al. (2008)[2] on the AICC2012 timescale of Veres et al. (2013)[3]. 1) The high resolution Marcott et al. (2014)[4] record could be used for an alternative simulation to the core, but not for the core.

CH4 from Loulergue et al. (2008)[5] on the AICC2012 timescale of Veres et al. (2013)[3].

N2O from Schilt et al. (2010)[6] on the AICC2012 timescale of Veres et al. (2013)[3].

Ice sheets: Choice of either the ICE-6G_C[7-8] or Lev Tarasov's[9-12] global reconstruction of ice sheet evolution.
Whichever is chosen for the LGM should be kept for the whole simulation.
[See the last deglaciation ice sheets page for more information on the ice sheets.]

Meltwater: no meltwater in the core. 2) Global meltwater fluxes that are consistent with the ice sheet reconstructions will be provided for alternative simulations to the core, but must not be used for the core.

Other boundary conditions: keep as per the LGM.

26-21 ka

For those who wish to begin their simulation from before the PMIP LGM, use:

Orbit as per Berger & Loutre (1991)[1] for this time period.

All other boundary conditions as per the PMIP LGM Working Group.

Points to discuss

Please think about the following points and add any comments on these or any other aspects of the experiment design to the discussion section below: [Topics will be added here as they are raised below or by email.]

No specific points yet.

References

Berger, A. & Loutre, M. F. Insolation values for the climate of the last 10 million years. Quat. Sci. Rev. 10, 297–317 (1991).

Lüthi, D. et al. High-resolution carbon dioxide concentration record 650,000–800,000 years before present. Nature 453, 379–382 (2008).

Veres, D. et al. The Antarctic ice core chronology (AICC2012): an optimized multi-parameter and multi-site dating approach for the last 120 thousand years. Clim Past 9, 1733–1748 (2013).

Marcott, S. A. et al. Centennial-scale changes in the global carbon cycle during the last deglaciation. Nature 514, 616–619 (2014).

Loulergue, L. et al. Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years. Nature 453, 383–386 (2008).

Schilt, A. et al. Atmospheric nitrous oxide during the last 140,000 years. Earth Planet. Sci. Lett. 300, 33–43 (2010).

Argus, D. F., Peltier, W. R., Drummond, R. & Moore, A. W. The Antarctica component of postglacial rebound model ICE-6G_C (VM5a) based on GPS positioning, exposure age dating of ice thicknesses, and relative sea level histories. Geophys. J. Int. ggu140 (2014).

Peltier, W. R., Argus, D. F. & Drummond, R. Space geodesy constrains ice age terminal deglaciation: The global ICE-6G_C (VM5a) model. J. Geophys. Res. Solid Earth 2014JB011176 (2015).

Tarasov, L. & Peltier, W. R. Greenland glacial history and local geodynamic consequences. Geophys. J. Int. 150, 198–229 (2002).

Tarasov, L., Dyke, A. S., Neal, R. M. & Peltier, W. R. A data-calibrated distribution of deglacial chronologies for the North American ice complex from glaciological modeling. Earth Planet. Sci. Lett. 315–316, 30–40 (2012)

Briggs, R. D., Pollard, D. & Tarasov, L. A data-constrained large ensemble analysis of Antarctic evolution since the Eemian. Quat. Sci. Rev. 103, 91–115 (2014).

Tarasov et al. Eurasian ice sheet evolution (in prep.).

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