Modelling the evolution of the Antarctic ice sheet since the last interglacial
We present the effects of changing two sliding parameters, a deformational velocity parameter and two bedrock deflection parameters on the evolution of the Antarctic ice sheet over the period from the last interglacial until the present. These sensitivity experiments have been conducted by running t...
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ftdoajarticles:oai:doaj.org/article:9a72275088174ad1bd59394581a8c2eb 2023-05-15T13:49:32+02:00 Modelling the evolution of the Antarctic ice sheet since the last interglacial M. N. A. Maris B. de Boer S. R. M. Ligtenberg M. Crucifix W. J. van de Berg J. Oerlemans 2014-07-01T00:00:00Z https://doi.org/10.5194/tc-8-1347-2014 https://doaj.org/article/9a72275088174ad1bd59394581a8c2eb EN eng Copernicus Publications http://www.the-cryosphere.net/8/1347/2014/tc-8-1347-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1347-2014 https://doaj.org/article/9a72275088174ad1bd59394581a8c2eb The Cryosphere, Vol 8, Iss 4, Pp 1347-1360 (2014) Environmental sciences GE1-350 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/tc-8-1347-2014 2022-12-31T14:55:27Z We present the effects of changing two sliding parameters, a deformational velocity parameter and two bedrock deflection parameters on the evolution of the Antarctic ice sheet over the period from the last interglacial until the present. These sensitivity experiments have been conducted by running the dynamic ice model ANICE forward in time. The temporal climatological forcing is established by interpolating between two temporal climate states created with a regional climate model. The interpolation is done in such a way that both temperature and surface mass balance follow the European Project for Ice Coring in Antarctica (EPICA) Dome C ice-core proxy record for temperature. We have determined an optimal set of parameter values, for which a realistic grounding-line retreat history and present-day ice sheet can be simulated; the simulation with this set of parameter values is defined as the reference simulation. An increase of sliding with respect to this reference simulation leads to a decrease of the Antarctic ice volume due to enhanced ice velocities on mainly the West Antarctic ice sheet. The effect of changing the deformational velocity parameter mainly yields a change in east Antarctic ice volume. Furthermore, we have found a minimum in the Antarctic ice volume during the mid-Holocene, in accordance with observations. This is a robust feature in our model results, where the strength and the timing of this minimum are both dependent on the investigated parameters. More sliding and a slower responding bedrock lead to a stronger minimum which emerges at an earlier time. From the model results, we conclude that the Antarctic ice sheet has contributed 10.7 ± 1.3 m of eustatic sea level to the global ocean from the last glacial maximum (about 16 ka for the Antarctic ice sheet) until the present. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Ice Sheet The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic West Antarctic Ice Sheet The Cryosphere 8 4 1347 1360 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 M. N. A. Maris B. de Boer S. R. M. Ligtenberg M. Crucifix W. J. van de Berg J. Oerlemans Modelling the evolution of the Antarctic ice sheet since the last interglacial |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
We present the effects of changing two sliding parameters, a deformational velocity parameter and two bedrock deflection parameters on the evolution of the Antarctic ice sheet over the period from the last interglacial until the present. These sensitivity experiments have been conducted by running the dynamic ice model ANICE forward in time. The temporal climatological forcing is established by interpolating between two temporal climate states created with a regional climate model. The interpolation is done in such a way that both temperature and surface mass balance follow the European Project for Ice Coring in Antarctica (EPICA) Dome C ice-core proxy record for temperature. We have determined an optimal set of parameter values, for which a realistic grounding-line retreat history and present-day ice sheet can be simulated; the simulation with this set of parameter values is defined as the reference simulation. An increase of sliding with respect to this reference simulation leads to a decrease of the Antarctic ice volume due to enhanced ice velocities on mainly the West Antarctic ice sheet. The effect of changing the deformational velocity parameter mainly yields a change in east Antarctic ice volume. Furthermore, we have found a minimum in the Antarctic ice volume during the mid-Holocene, in accordance with observations. This is a robust feature in our model results, where the strength and the timing of this minimum are both dependent on the investigated parameters. More sliding and a slower responding bedrock lead to a stronger minimum which emerges at an earlier time. From the model results, we conclude that the Antarctic ice sheet has contributed 10.7 ± 1.3 m of eustatic sea level to the global ocean from the last glacial maximum (about 16 ka for the Antarctic ice sheet) until the present. |
format |
Article in Journal/Newspaper |
author |
M. N. A. Maris B. de Boer S. R. M. Ligtenberg M. Crucifix W. J. van de Berg J. Oerlemans |
author_facet |
M. N. A. Maris B. de Boer S. R. M. Ligtenberg M. Crucifix W. J. van de Berg J. Oerlemans |
author_sort |
M. N. A. Maris |
title |
Modelling the evolution of the Antarctic ice sheet since the last interglacial |
title_short |
Modelling the evolution of the Antarctic ice sheet since the last interglacial |
title_full |
Modelling the evolution of the Antarctic ice sheet since the last interglacial |
title_fullStr |
Modelling the evolution of the Antarctic ice sheet since the last interglacial |
title_full_unstemmed |
Modelling the evolution of the Antarctic ice sheet since the last interglacial |
title_sort |
modelling the evolution of the antarctic ice sheet since the last interglacial |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1347-2014 https://doaj.org/article/9a72275088174ad1bd59394581a8c2eb |
geographic |
Antarctic The Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic The Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica EPICA ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 4, Pp 1347-1360 (2014) |
op_relation |
http://www.the-cryosphere.net/8/1347/2014/tc-8-1347-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1347-2014 https://doaj.org/article/9a72275088174ad1bd59394581a8c2eb |
op_doi |
https://doi.org/10.5194/tc-8-1347-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1347 |
op_container_end_page |
1360 |
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1766251475503153152 |