ISMIP-HEINO experiment revisited: effect of higher-order approximation and sensitivity study
Authors: Souček, Ondřej; Martinec, Zdeněk
Source: Journal of Glaciology, Volume 57, Number 206, December 2011 , pp. 1158-1170(13)
Publisher: International Glaciological Society
Abstract:We revisit the results of the ISMIP-HEINO benchmark by first analyzing the differences in various model outputs using a wavelet-based spectral technique. Second, the ISMIP-HEINO benchmark experiments are recomputed with a novel numerical ice-sheet model based on the SIA-I algorithm that enables both the shallow-ice and a higher-order approximation of the ice-flow equations to be performed. To assess the significance of the higher-order approximation in the ISMIP-HEINO experiment, a numerical sensitivity study for the shallow-ice approximation (SIA) simulations is also carried out. A high sensitivity of the SIA model response to surface temperature perturbations is found. We conclude that the variations in ISMIP-HEINO results are due to the differences in (1) simulated basal temperatures and (2) numerical treatment of the basal sliding condition.
Document Type: Research Article
Publication date: December 1, 2011
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