Large-scale model reconstructions of the polar ice sheets during the glacial cycles
Glaciological models have an important role to integrate the various pieces of palaeoclimatic information, to interpret the glacial-geological record in terms of climatic and ice-dynamic processes and to establish the ice thickness distribution over time, which can usually not be derived directly fr...
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ftawi:oai:epic.awi.de:6985 2023-09-05T13:14:08+02:00 Large-scale model reconstructions of the polar ice sheets during the glacial cycles Huybrechts, Philippe 2000 https://epic.awi.de/id/eprint/6985/ https://hdl.handle.net/10013/epic.17530 unknown Huybrechts, P. (2000) Large-scale model reconstructions of the polar ice sheets during the glacial cycles , EPILOG symposium, Mount Hood, Oregon (USA)October 2000. . hdl:10013/epic.17530 EPIC3EPILOG symposium, Mount Hood, Oregon (USA)October 2000., 1 Conference notRev 2000 ftawi 2023-08-22T19:46:28Z Glaciological models have an important role to integrate the various pieces of palaeoclimatic information, to interpret the glacial-geological record in terms of climatic and ice-dynamic processes and to establish the ice thickness distribution over time, which can usually not be derived directly from observations. This talk will primarily review model simulations of the Antarctic and Greenland ice sheets during the last few glacial cycles obtained from three-dimensional thermomechanical models. These models freely generate ice-sheet volume and extent and are driven by changes of temperature, mass balance, and sea-level. The emphasis will be on reconstructions of the LGM and on a discussion of a series of sensitivity experiments dealing with (i) the temperature forcing as derived from ice cores, (ii) the treatment of accumulation changes, (iii) basal sliding, (iv) the speed of isostatic adjustment, (v) the role of thermomechanical coupling, and (vi) viscosity changes and the rate of basal melting below Antarctic ice shelves.For the Antarctic ice sheet, we generally find that changes in the ice shelf have an important control on the position of the grounding line at the LGM and that in most runs the deglaciation of the Ross and Weddell basins occurs after 10000 years BP to be nearly completed by the present time. The ice over central East Antarctica is generally thinner during glacial periods than today leading to an overall Antarctic contribution to sea-level lowering at the LGM of about 15-20 m, significantly less than the older CLIMAP reconstructions.Boundary conditions for modelling the Greenland ice sheet appear to be better constrained and the most sensitive period concerns the size of the ice sheet during the Eemian. For the LGM, almost all of the runs show a maximum extent close to the continental break together with a thinning of the central areas by up to several hunded meters. It is unlikely that the Greenland ice sheet has contributed more than 2-3 meters to the sea-level lowering at the ... Conference Object Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Ice Shelf Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic East Antarctica Greenland The Antarctic Weddell |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Glaciological models have an important role to integrate the various pieces of palaeoclimatic information, to interpret the glacial-geological record in terms of climatic and ice-dynamic processes and to establish the ice thickness distribution over time, which can usually not be derived directly from observations. This talk will primarily review model simulations of the Antarctic and Greenland ice sheets during the last few glacial cycles obtained from three-dimensional thermomechanical models. These models freely generate ice-sheet volume and extent and are driven by changes of temperature, mass balance, and sea-level. The emphasis will be on reconstructions of the LGM and on a discussion of a series of sensitivity experiments dealing with (i) the temperature forcing as derived from ice cores, (ii) the treatment of accumulation changes, (iii) basal sliding, (iv) the speed of isostatic adjustment, (v) the role of thermomechanical coupling, and (vi) viscosity changes and the rate of basal melting below Antarctic ice shelves.For the Antarctic ice sheet, we generally find that changes in the ice shelf have an important control on the position of the grounding line at the LGM and that in most runs the deglaciation of the Ross and Weddell basins occurs after 10000 years BP to be nearly completed by the present time. The ice over central East Antarctica is generally thinner during glacial periods than today leading to an overall Antarctic contribution to sea-level lowering at the LGM of about 15-20 m, significantly less than the older CLIMAP reconstructions.Boundary conditions for modelling the Greenland ice sheet appear to be better constrained and the most sensitive period concerns the size of the ice sheet during the Eemian. For the LGM, almost all of the runs show a maximum extent close to the continental break together with a thinning of the central areas by up to several hunded meters. It is unlikely that the Greenland ice sheet has contributed more than 2-3 meters to the sea-level lowering at the ... |
format |
Conference Object |
author |
Huybrechts, Philippe |
spellingShingle |
Huybrechts, Philippe Large-scale model reconstructions of the polar ice sheets during the glacial cycles |
author_facet |
Huybrechts, Philippe |
author_sort |
Huybrechts, Philippe |
title |
Large-scale model reconstructions of the polar ice sheets during the glacial cycles |
title_short |
Large-scale model reconstructions of the polar ice sheets during the glacial cycles |
title_full |
Large-scale model reconstructions of the polar ice sheets during the glacial cycles |
title_fullStr |
Large-scale model reconstructions of the polar ice sheets during the glacial cycles |
title_full_unstemmed |
Large-scale model reconstructions of the polar ice sheets during the glacial cycles |
title_sort |
large-scale model reconstructions of the polar ice sheets during the glacial cycles |
publishDate |
2000 |
url |
https://epic.awi.de/id/eprint/6985/ https://hdl.handle.net/10013/epic.17530 |
geographic |
Antarctic East Antarctica Greenland The Antarctic Weddell |
geographic_facet |
Antarctic East Antarctica Greenland The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Ice Shelf |
op_source |
EPIC3EPILOG symposium, Mount Hood, Oregon (USA)October 2000., 1 |
op_relation |
Huybrechts, P. (2000) Large-scale model reconstructions of the polar ice sheets during the glacial cycles , EPILOG symposium, Mount Hood, Oregon (USA)October 2000. . hdl:10013/epic.17530 |
_version_ |
1776205187326672896 |