Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate
An efficient numerical ice sheet model, including time dependence and full thermo-mechanical coupling, has been developed to investigatethe thermal regime and overall configuration of a polar ice sheet with respect to changing environmental conditions. From basic sensitivityexperiments, in which a s...
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ftawi:oai:epic.awi.de:3659 2024-09-15T17:39:58+00:00 Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate Huybrechts, Philippe Oerlemans, J. 1988 application/pdf https://epic.awi.de/id/eprint/3659/ https://epic.awi.de/id/eprint/3659/1/Huy1988a.pdf https://hdl.handle.net/10013/epic.14236 https://hdl.handle.net/10013/epic.14236.d001 unknown https://epic.awi.de/id/eprint/3659/1/Huy1988a.pdf https://hdl.handle.net/10013/epic.14236.d001 Huybrechts, P. and Oerlemans, J. (1988) Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate , Annals of Glaciology, 11 , pp. 52-59 . hdl:10013/epic.14236 EPIC3Annals of Glaciology, 11, pp. 52-59 Article isiRev 1988 ftawi 2024-06-24T03:54:11Z An efficient numerical ice sheet model, including time dependence and full thermo-mechanical coupling, has been developed to investigatethe thermal regime and overall configuration of a polar ice sheet with respect to changing environmental conditions. From basic sensitivityexperiments, in which a schematic East-Antarctic Ice Sheet is forced with a typical glacial-interglacial climatic shift, it is found that (i):themutual interaction of temperature and deformation has a stabilizing effect on its steady state configuration (ii) in the transient mode, thisclimatic transition initially leads to increased ice thickness due to enhanced accumulation, whereafter this trend is reversed due to a warmerbase. Time scales for this reversal are of the order of 103 years in marginal zones and of 104 years in interior parts. (iii): horizontal heatadvection plays a major role in damping possible runaway behaviour due to the dissipation-strain rate feedback, suggesting that creepinstability is a rather unlikely canditate to initiate surging of the East-Antarctic Ice Sheet.The model is then applied to 4 East-Antarctic flowlines. Only the flowline passing through Wilkes Land appears to be vulnerable towidespread basal melting due to enhanced basal warming following a climatic warming. Time-dependent modelling of the Vostokflowline, indicates that the Vostok Station area has risen about 95 m since the beginning of the present interglacial, which is of particularinterest in interpreting the palaeoclimatic signal of the obtained ice core there. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic ice core Ice Sheet Wilkes Land Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
An efficient numerical ice sheet model, including time dependence and full thermo-mechanical coupling, has been developed to investigatethe thermal regime and overall configuration of a polar ice sheet with respect to changing environmental conditions. From basic sensitivityexperiments, in which a schematic East-Antarctic Ice Sheet is forced with a typical glacial-interglacial climatic shift, it is found that (i):themutual interaction of temperature and deformation has a stabilizing effect on its steady state configuration (ii) in the transient mode, thisclimatic transition initially leads to increased ice thickness due to enhanced accumulation, whereafter this trend is reversed due to a warmerbase. Time scales for this reversal are of the order of 103 years in marginal zones and of 104 years in interior parts. (iii): horizontal heatadvection plays a major role in damping possible runaway behaviour due to the dissipation-strain rate feedback, suggesting that creepinstability is a rather unlikely canditate to initiate surging of the East-Antarctic Ice Sheet.The model is then applied to 4 East-Antarctic flowlines. Only the flowline passing through Wilkes Land appears to be vulnerable towidespread basal melting due to enhanced basal warming following a climatic warming. Time-dependent modelling of the Vostokflowline, indicates that the Vostok Station area has risen about 95 m since the beginning of the present interglacial, which is of particularinterest in interpreting the palaeoclimatic signal of the obtained ice core there. |
format |
Article in Journal/Newspaper |
author |
Huybrechts, Philippe Oerlemans, J. |
spellingShingle |
Huybrechts, Philippe Oerlemans, J. Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate |
author_facet |
Huybrechts, Philippe Oerlemans, J. |
author_sort |
Huybrechts, Philippe |
title |
Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate |
title_short |
Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate |
title_full |
Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate |
title_fullStr |
Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate |
title_full_unstemmed |
Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate |
title_sort |
evolution of the east antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate |
publishDate |
1988 |
url |
https://epic.awi.de/id/eprint/3659/ https://epic.awi.de/id/eprint/3659/1/Huy1988a.pdf https://hdl.handle.net/10013/epic.14236 https://hdl.handle.net/10013/epic.14236.d001 |
genre |
Annals of Glaciology Antarc* Antarctic ice core Ice Sheet Wilkes Land |
genre_facet |
Annals of Glaciology Antarc* Antarctic ice core Ice Sheet Wilkes Land |
op_source |
EPIC3Annals of Glaciology, 11, pp. 52-59 |
op_relation |
https://epic.awi.de/id/eprint/3659/1/Huy1988a.pdf https://hdl.handle.net/10013/epic.14236.d001 Huybrechts, P. and Oerlemans, J. (1988) Evolution of the East Antarctic ice sheet: a numerical study of thermo-mechanical response patterns with changing climate , Annals of Glaciology, 11 , pp. 52-59 . hdl:10013/epic.14236 |
_version_ |
1810483716400611328 |