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      Resolution of ice streams and outlet glaciers in large-scale simulations of the Greenland ice sheet

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      Annals of Glaciology
      Cambridge University Press (CUP)

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          Abstract

          The dynamic/thermodynamic shallow-ice model SICOPOLIS is applied to the Greenland ice sheet. Paleoclimatic spin-ups from 125 ka BP until today, as well as future-climate experiments 500 years into the future, are carried out with three different grid spacings, namely 20, 10 and 5 km. The scenarios are a subset of those specified by the SeaRISE (Sea-level Response to Ice Sheet Evolution) community effort. The bed topography includes improved troughs for Jakobshavn Isbræ, Helheim, Kangerdlugssuaq and Petermann glaciers, processed by an algorithm that preserves shape, orientation and continuity of the troughs on the 5 km scale. Comparison of simulated and observed present-day surface velocities shows that these ice streams and outlet glaciers are resolved with different accuracies, ranging from poor (20 km grid) to reasonably good (5 km grid). In the future-climate experiments, the simulated absolute ice volumes depend significantly on the resolution, while the sensitivities (ice volumes relative to the constant-climate control run) vary only by a few centimeters of sea-level equivalent.

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          Most cited references29

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          Heat flow from the Earth's interior: Analysis of the global data set

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            Greenland flow variability from ice-sheet-wide velocity mapping

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              Large-scale ice flow over a viscous basal sediment: Theory and application to ice stream B, Antarctica

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                Author and article information

                Journal
                applab
                Annals of Glaciology
                Ann. Glaciol.
                Cambridge University Press (CUP)
                0260-3055
                1727-5644
                2013
                July 26 2017
                2013
                : 54
                : 63
                : 209-220
                Article
                10.3189/2013AoG63A085
                b3edfbe9-f54f-42d5-9aa8-ff91954a85ae
                © 2013
                History

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