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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2014-07-01
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| Series: | The Cryosphere |
| Online Access: | http://www.the-cryosphere.net/8/1347/2014/tc-8-1347-2014.pdf |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-23T20:25:33Z |
| format | Article |
| id | doaj.art-9a72275088174ad1bd59394581a8c2eb |
| institution | Directory Open Access Journal |
| issn | 1994-0416 1994-0424 |
| language | English |
| last_indexed | 2024-12-23T20:25:33Z |
| publishDate | 2014-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The Cryosphere |
| spelling | doaj.art-9a72275088174ad1bd59394581a8c2eb2022-12-21T17:32:23ZengCopernicus PublicationsThe Cryosphere1994-04161994-04242014-07-01841347136010.5194/tc-8-1347-2014Modelling the evolution of the Antarctic ice sheet since the last interglacialM. N. A. Maris0B. de Boer1S. R. M. Ligtenberg2M. Crucifix3W. J. van de Berg4J. Oerlemans5Institute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80005, 3508 TA Utrecht, the NetherlandsInstitute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80005, 3508 TA Utrecht, the NetherlandsInstitute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80005, 3508 TA Utrecht, the NetherlandsEarth and Life Institute (ELI), Georges Lemaître Centre for Earth and Climate Research (TECLIM), Place Louis Pasteur 3, SC10 – L4.03.08, 1348 Louvain-la-Neuve, BelgiumInstitute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80005, 3508 TA Utrecht, the NetherlandsInstitute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80005, 3508 TA Utrecht, the NetherlandsWe 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.http://www.the-cryosphere.net/8/1347/2014/tc-8-1347-2014.pdf |
| spellingShingle | 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 The Cryosphere |
| title | 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_short | 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 |
| url | http://www.the-cryosphere.net/8/1347/2014/tc-8-1347-2014.pdf |
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