Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula
In this study, the flow and rheology of pre-collapse Larsen B ice shelf are investigated by using a combination of flow modelling and data assimilation. Observed shelf velocities from satellite interferometry are used to constrain an ice shelf model by using a data assimilation technique based on th...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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crroyalsociety:10.1098/rsta.2006.1800 2024-09-15T17:48:14+00:00 Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula Vieli, Andreas Payne, Antony J Du, Zhijun Shepherd, Andrew 2006 http://dx.doi.org/10.1098/rsta.2006.1800 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2006.1800 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2006.1800 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 364, issue 1844, page 1815-1839 ISSN 1364-503X 1471-2962 journal-article 2006 crroyalsociety https://doi.org/10.1098/rsta.2006.1800 2024-08-26T04:21:02Z In this study, the flow and rheology of pre-collapse Larsen B ice shelf are investigated by using a combination of flow modelling and data assimilation. Observed shelf velocities from satellite interferometry are used to constrain an ice shelf model by using a data assimilation technique based on the control method. In particular, the ice rheology field and the velocities at the inland shelf boundary are simultaneously optimized to get a modelled flow and stress field that is consistent with the observed flow. The application to the Larsen B ice shelf shows that a strong weakening of the ice in the shear zones, mostly along the margins, is necessary to fit the observed shelf flow. This pattern of bands with weak ice is a very robust feature of the inversion, whereas the ice rheology within the main shelf body is found to be not well constrained. This suggests that these weak zones play a major role in the control of the flow of the Larsen B ice shelf and may be the key to understanding the observed pre-collapse thinning and acceleration of Larsen B. Regarding the sensitivity of the stress field to rheology, the consistency of the model with the observed flow seems crucial for any further analysis such as the application of fracture mechanics or perturbation model experiments. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Shelf The Royal Society Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364 1844 1815 1839 |
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Open Polar |
collection |
The Royal Society |
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crroyalsociety |
language |
English |
description |
In this study, the flow and rheology of pre-collapse Larsen B ice shelf are investigated by using a combination of flow modelling and data assimilation. Observed shelf velocities from satellite interferometry are used to constrain an ice shelf model by using a data assimilation technique based on the control method. In particular, the ice rheology field and the velocities at the inland shelf boundary are simultaneously optimized to get a modelled flow and stress field that is consistent with the observed flow. The application to the Larsen B ice shelf shows that a strong weakening of the ice in the shear zones, mostly along the margins, is necessary to fit the observed shelf flow. This pattern of bands with weak ice is a very robust feature of the inversion, whereas the ice rheology within the main shelf body is found to be not well constrained. This suggests that these weak zones play a major role in the control of the flow of the Larsen B ice shelf and may be the key to understanding the observed pre-collapse thinning and acceleration of Larsen B. Regarding the sensitivity of the stress field to rheology, the consistency of the model with the observed flow seems crucial for any further analysis such as the application of fracture mechanics or perturbation model experiments. |
format |
Article in Journal/Newspaper |
author |
Vieli, Andreas Payne, Antony J Du, Zhijun Shepherd, Andrew |
spellingShingle |
Vieli, Andreas Payne, Antony J Du, Zhijun Shepherd, Andrew Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula |
author_facet |
Vieli, Andreas Payne, Antony J Du, Zhijun Shepherd, Andrew |
author_sort |
Vieli, Andreas |
title |
Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula |
title_short |
Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula |
title_full |
Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula |
title_fullStr |
Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula |
title_full_unstemmed |
Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula |
title_sort |
numerical modelling and data assimilation of the larsen b ice shelf, antarctic peninsula |
publisher |
The Royal Society |
publishDate |
2006 |
url |
http://dx.doi.org/10.1098/rsta.2006.1800 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2006.1800 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2006.1800 |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Shelf |
op_source |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 364, issue 1844, page 1815-1839 ISSN 1364-503X 1471-2962 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsta.2006.1800 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
364 |
container_issue |
1844 |
container_start_page |
1815 |
op_container_end_page |
1839 |
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1810289393993252864 |