Results from the EISMINT model intercomparison: the effects of thermomechanical coupling

By Antony J. Payne, P. Huybrechts, A. Abe‐Ouchi, R. Calov, J. Fastook, Ralf Greve, S. Marshall, I. Marsiat, Catherine Ritz, L. Tarasov and 1 more. 2000

231 citations recorded by the source corpus.

This paper discusses results from the second phase of the European Ice sheet Modelling Initiative (EISMINT). It reports the intercompartison of ten operational ice-sheet models and uses a series of experiments to examine the implications of thermomechanical coupling for model behaviour. A schematic, circular ice sheet is used in the work which investigates both steady states and the response to stepped changes in climate. The major finding is that radial symmetry implied in the experimental design can, under certain circumstances, break down with the formation of distinct, regularly spaced spokes of cold ice which extended from the interior of the ice sheet outward to the surrounding zone of basal melt. These features also manifest themselves in the thickness and velocity distributions predicted by the models. They appear to be a common feature to all of the models which took part in the intercomparison, and may stem from interactions between ice temperature, flow and surface form. The exact nature of these features varies between models, and their existence appears to be controlled by the overall thermal regimne of the ice sheet. A second result is that there is considerable agreement between the models in their predictions of global-scale response to imposed climate change.

Subfields: Atmospheric Science, Management, Monitoring, Policy and Law, Pulmonary and Respiratory Medicine

View Paper: https://www.semanticscholar.org/paper/717dbe5cecbdfe5782447b5d1073a4c6d24eb7ac

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Citations in the corpus

Shallow shelf approximation as a “sliding law” in a thermomechanically coupled ice sheet model (2008, background): “The membrane stresses and the basal stress τb all appear on the left side as parts of the matrix A.”
The ISMIP-HOM benchmark experiments performed using the Finite-Element code Elmer (2008, methodology): “In Zwinger et al. (2007), we chose Nonuniform Rational B-Splines ( Les and Wayne, 1997) interpolation in order to get a smooth bedrock geometry, which enabled us to do the runs using linear elements.”
Physical Climate Processes and Feedbacks (2001, background): “In general, these models perform well in intercomparison exercises (Huybrechts et al., 1996; Payne et al., 2000), but there is uncertainty in the predicted thermal structure and bottom melting conditions.”
A geophysically constrained large ensemble analysis of the deglacial history of the North American ice-sheet complex (2004, methodology): “with the surface elevation of GRIP ðhGRIPðtÞÞ taken from the tuned model (GrB) of Tarasov and Peltier (2003). In order to better fit the inferred rate of glaciation during inception, we found it necessary to add 0.”