Articles | Volume 5, issue 4
Geosci. Model Dev., 5, 963–974, 2012
https://doi.org/10.5194/gmd-5-963-2012

Special issue: PlioMIP: experimental design, mid-Pliocene boundary conditions...

Geosci. Model Dev., 5, 963–974, 2012
https://doi.org/10.5194/gmd-5-963-2012

Model experiment description paper 18 Jul 2012

Model experiment description paper | 18 Jul 2012


Pliocene Ice Sheet Modelling Intercomparison Project (PLISMIP) – experimental design

A. M. Dolan1,*, S. J. Koenig2,*, D. J. Hill1,3, A. M. Haywood1, and R. M. DeConto2 A. M. Dolan et al.
  • 1School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
  • 2Department of Geosciences, University of Massachusetts, Amherst, MA 01003, USA
  • 3British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK
  • *These authors contributed equally to this work.

Abstract. During the mid-Pliocene warm period (3.264 to 3.025 million years ago), global mean temperature was similar to that predicted for the next century and atmospheric carbon dioxide concentrations were slightly higher than today. Sea level was also higher than today, implying a reduction in the extent of the ice sheets. Thus, the mid-Pliocene warm period (mPWP) provides a unique testing ground to investigate the stability of the Earth's ice sheets and their contribution to sea level in a warmer-than-modern world. Climate models and ice sheet models can be used to enhance our understanding of ice sheet stability; however, uncertainties associated with different ice-sheet modelling frameworks mean that a rigorous comparison of numerical ice sheet model simulations for the Pliocene is essential. As an extension to the Pliocene Model Intercomparison Project (PlioMIP; Haywood et al., 2010, 2011a), the Pliocene Ice Sheet Modelling Intercomparison Project (PLISMIP) will provide the first assessment as to the ice sheet model dependency of ice sheet predictions for the mPWP. Here we outline the PLISMIP experimental design and initialisation conditions that have been adopted to simulate the Greenland and Antarctic ice sheets under present-day and warm mid-Pliocene conditions. Not only will this project provide a new benchmark in the simulation of ice sheets in a past warm period, but the analysis of model sensitivity to various uncertainties could directly inform future predictions of ice sheet and sea level change.