Last Deglaciation Ice Sheets

Contacts: Ruža Ivanović, Lauren Gregoire, Didier Roche

Go back to the main core experiment design page.
Go back to the main working group page.
Please note, this page is a work in progress and is not ready for discussion yet.
Please use the Discussion section below to specifically comment on the choice of ice sheet reconstructions for the core experiment.

Foreword

For the core experiment, there is a choice of two global ice sheet reconstructions:

ICE6G_C, provided by Dick Peltier, Rosmarie Drummond and co-authors

Lev Tarasov's reconstruction, provided by Lev Tarasov and co-authors.

Please one of these reconstructions for your Last Glacial Maximum (LGM) experiment, as per the LGM working group requirements, and continue to use the same reconstruction through the transient last deglaciation core simulation.
Those groups that are able may wish to carry out two simulations; one with each ice sheet reconstruction.

ICE6G_C Reconstruction

Key references:

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).

Ice Evolution, 21-0 ka

The ice mask in this reconstruction is fractional. For the purpose of the animations (below), we have used > 80 % ice cover per grid cell.1) Animations produced by Ruza Ivanovic, Feb 2015
ICE6G_C Northern Hemisphere ICE6G_C Southern Hemisphere

Sea Level Equivalent

The information in this section was provided directly by Dick Peltier et al., October 2014:

ICE6G_C Ice Sheets

Time dependent ice-equivalent contribution to eustatic sea level rise [relatice to present day] from each of the primary geographical regions from which grounded ice loss occurred during the [last] deglaciation process. 2) Plot provided by Dick Peltier, October 2014 ICE6G_C Eustatic Sea Level Equivalent of ice volume

ICE6G_C compared to previous versions

Ice-equivalent contribution to eustatic sea level rise (m) 3) relative to present day and assuming ocean area = 360,768,600 km2
Final ICE-4G	ICE-5G v1.2	ICE6G_C
26 ka
N. America (incl. Inuit area)	54.92	83.71	87.01
Greenland & Iceland	5.43	2.45	2.39
Fennoscandia	8.91	11.79	11.95
Barents/Kara Seas	12.26	9.29	10.61
U.K.	0.35	1.65	0.83
Patagonia	0.47	0.55	0.87
W. Antarctica	8.33	9.68	7.37
E. Antarctica	7.12	8.36	6.21
TOTAL	97.79	127.48	127.25
21 ka
N. America (incl. Innuit area)	64.24	81.47	78.82
Greenland & Iceland	6.38	2.49	2.41
Fennoscandia	10.39	11.19	10.10
Barents/Kara Seas	14.05	8.43	7.34
U.K.	0.42	1.48	0.57
Patagonia	0.55	0.55	0.82
W. Antarctica	9.74	9.68	7.37
E. Antarctica	8.35	8.36	6.21
TOTAL	114.12	123.65	113.68

Lev Tarasov's Reconstruction

Key references:

To be updated.

Ice Evolution, 21-0 ka

The ice mask in this reconstruction is based on 100 % ice or 0 % ice.1)
Lev Tarasov's Northern Hemisphere ice Lev Tarasov's Southern Hemisphere ice

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

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).

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