Polythermal ice sheet in antarctica

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Title: Simulation of the Antarctic ice sheet with a three-dimensional polythermal ice-sheet model, in support of the EPICA project. II. Nested high-resolution treatment of Dronning Maud Land, Antarctica
 

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May 16, 2019 · ‘Extraordinary thinning’ of ice sheets revealed deep inside Antarctica ... The West Antarctic ice sheet was stable in 1992 but up to a quarter of its expanse is now thinning. More than 100 ... SICOPOLIS (SImulation COde for POLythermal Ice Sheets) is a 3-d dynamic/thermodynamic model that simulates the evolution of large ice sheets and ice caps. It was originally created by Greve (1997a,b) in a version for the Greenland ice sheet. Since then, SICOPOLIS has been developed continuously and applied to problems of past, present and future glaciation of Greenland, Antarctica, the entire northern hemisphere, the polar ice caps of the planet Mars and others.
 

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Polythermal conditions in ice sheets are found in both Greenland and Antarctica. Current ice sheet models can be divided into two groups: (1) "Cold-ice method" ice sheet models; and (2) truly polythermal ice sheet models. The only member of the second group uses a front-tracking method to handle the internal free cold- temperate transition surface. Apr 28, 2007 · The application of two different methods for the computation of the age of ice is discussed within the frame of numerical ice sheet modelling. The first method solves the purely advective equation for the age field in the Eulerian frame, which requires the addition of a numerical diffusion term to stabilize the solution and therefore produces ... May 16, 2019 · ‘Extraordinary thinning’ of ice sheets revealed deep inside Antarctica ... The West Antarctic ice sheet was stable in 1992 but up to a quarter of its expanse is now thinning. More than 100 ...

Ice sheets, ice shelves, ice caps and glaciers are active, dynamic components of the climate system of the Earth, and they deserve the same scientiflc at-tention as the atmosphere and the oceans. However, while the dynamics of the atmosphere and the oceans have been studied intensively and literature Aug 26, 2014 · Polythermal glaciers are glaciers that have a mixed basal thermal regime. These glaciers have warm ice (at 0°C) in their interior where the ice is thick and is warmed to the pressure melt point, and cold ice (below 0°C) around their margins where ice is thin and on their surface. Model skill is demonstrated by experiments with a simplified ice sheet geometry and by comparisons of simulated ice cores with data from Greenland (GRIP) and Antarctica (Vostok). The presented method is a valuable tool to investigate the transport of any kind of passive tracer inside the cold ice part of a polythermal ice sheet and is an ... Nov 08, 2017 · At a Glance. A NASA study has discovered new evidence of an ancient geothermal heat source beneath West Antarctica. The research could help scientists better estimate future ice loss in the area.

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A new NASA study says that an increase in Antarctic snow accumulation that began 10,000 years ago is currently adding enough ice to the continent to outweigh the increased losses from its thinning glaciers.