Last Deglaciation Core Experiment Design
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Proposal
Following wide consultation, this is our experiment design for the last deglaciation core simulation. It is currently in Geoscientific Model Development Discussions:
Ivanovic, R. F., L. J. Gregoire, M. Kageyama, D. M. Roche, P. J. Valdes, A. Burke, R. Drummond, W. R. Peltier, and L. Tarasov (2015), Transient climate simulations of the deglaciation 21–9 thousand years before present; PMIP4 Core experiment design and boundary conditions, Geosci Model Dev Discuss, 8(10), 9045–9102, doi:10.5194/gmdd-8-9045-2015
To make sure we incorporate your comments in the final, published experiment design, please use GMD's discussion facility for the manuscript, which will stay open until 16th December 2015.
The published version of the experiment design is/will be the definitive version and supersedes any differences on this wiki. Data will be available to download from this wiki when the manuscript is accepted in its final state.
Please use the Discussion section below and our mailing list for general discussion on the working group.
There are also the following dedicated pages:
Transient simulation 21-9 ka
All core simulations must span this time-period. Note that forcings provided will run 21-0 ka.
Please use:
An equilibrium-type LGM climate simulation to initialise the transient simulation, OR a transient 26-21 ka LGM simulation. See below.
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Ice sheets: Choice of either the
ICE-6G_C[7-8] or
GLAC-1D[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.]
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Other boundary conditions: keep as per the LGM. For example :
Equilibrium-type LGM 21 ka
In some cases, the following constraints may differ from other PMIP 21 ka experiments. If possible, please make sure you use the setup described here:
Orbital parameters:
Solar constant: same as for the preindustrial (e.g. 1365 W/m2)
Trace gases:
Ice sheets:
ICE-6G_C or
GLAC-1D - use whichever you will use for the ensuing transient simulation
Topography and coastlines: as per the chosen ice sheet. Please ensure that rivers reach the ocean.
Bathymetry: Optional. If possible, as per the chosen ice sheet. Otherwise, up to the user to decide.
Global ocean salinity: +1 psu
Freshwater budget: Please note the PMIP LGM advice to try to avoid unnecessary ocean salinity drifts. You may need to route excess snow to the ocean.
Other boundary conditions: consistent with the Core
26-21 ka LGM
For those who wish to begin their simulation from before the PMIP LGM, use the following transient data:
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.]
References
Berger, A. Long-Term Variations of Daily Insolation and Quaternary Climatic Changes. J. Atmospheric Sci. 35(12), 2362–2367 (1978).
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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