Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
Geosci. Model Dev., 9, 1673-1682, 2016
https://doi.org/10.5194/gmd-9-1673-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Model description paper
03 May 2016
ICESHEET 1.0: a program to produce paleo-ice sheet reconstructions with minimal assumptions
Evan J. Gowan1,2,3, Paul Tregoning3, Anthony Purcell3, James Lea4,1,2, Oscar J. Fransner5, Riko Noormets5, and J. A. Dowdeswell6 1Department of Physical Geography, Stockholm University, Stockholm, Sweden
2Bolin Center for Climate Research, Stockholm, Sweden
3Research School of Earth Science, The Australian National University, Canberra, Australia
4School of Environmental Sciences, University of Liverpool, Liverpool, UK
5Department of Arctic Geology, The University Center in Svalbard (UNIS), Longyearbyen, Norway
6Scott Polar Research Institute, Cambridge, UK
Abstract. We describe a program that produces paleo-ice sheet reconstructions using an assumption of steady-state, perfectly plastic ice flow behaviour. It incorporates three input parameters: ice margin, basal shear stress and basal topography. Though it is unlikely that paleo-ice sheets were ever in complete steady-state conditions, this method can produce an ice sheet without relying on complicated and unconstrained parameters such as climate and ice dynamics. This makes it advantageous to use in glacial-isostatic adjustment ice sheet modelling, which are often used as input parameters in global climate modelling simulations. We test this program by applying it to the modern Greenland Ice Sheet and Last Glacial Maximum Barents Sea Ice Sheet and demonstrate the optimal parameters that balance computational time and accuracy.

Citation: Gowan, E. J., Tregoning, P., Purcell, A., Lea, J., Fransner, O. J., Noormets, R., and Dowdeswell, J. A.: ICESHEET 1.0: a program to produce paleo-ice sheet reconstructions with minimal assumptions, Geosci. Model Dev., 9, 1673-1682, https://doi.org/10.5194/gmd-9-1673-2016, 2016.
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We present a program that can create paleo-ice sheet reconstructions, using an assumed basal shear stress, margin location and basal topography as input. This allows for the quick determination of relatively realistic past ice sheet configurations without reliance on highly uncertain factors such as climate and ice dynamics. This is ideal for modelling Earth deformation due to the loading of ice sheets. The subsequent ice sheet configurations can be used as an input for climate modelling.
We present a program that can create paleo-ice sheet reconstructions, using an assumed basal...
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