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...
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ftunivzuerich:oai:www.zora.uzh.ch:136409 2024-06-23T07:46:41+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 application/pdf https://www.zora.uzh.ch/id/eprint/136409/ https://www.zora.uzh.ch/id/eprint/136409/1/2006_Vieli_1815.full.pdf https://doi.org/10.5167/uzh-136409 https://doi.org/10.1098/rsta.2006.1800 eng eng Royal Society Publishing https://www.zora.uzh.ch/id/eprint/136409/1/2006_Vieli_1815.full.pdf doi:10.5167/uzh-136409 doi:10.1098/rsta.2006.1800 info:pmid/16782611 urn:issn:1364-503X info:eu-repo/semantics/closedAccess Vieli, Andreas; Payne, Antony J; Du, Zhijun; Shepherd, Andrew (2006). Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula. Philosophical Transactions of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 364(1844):1815-1839. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2006 ftunivzuerich https://doi.org/10.5167/uzh-13640910.1098/rsta.2006.1800 2024-05-29T00:39:00Z 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 University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Antarctic Antarctic Peninsula |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Vieli, Andreas Payne, Antony J Du, Zhijun Shepherd, Andrew Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula |
topic_facet |
Institute of Geography 910 Geography & travel |
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 |
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 |
Royal Society Publishing |
publishDate |
2006 |
url |
https://www.zora.uzh.ch/id/eprint/136409/ https://www.zora.uzh.ch/id/eprint/136409/1/2006_Vieli_1815.full.pdf https://doi.org/10.5167/uzh-136409 https://doi.org/10.1098/rsta.2006.1800 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Shelf |
op_source |
Vieli, Andreas; Payne, Antony J; Du, Zhijun; Shepherd, Andrew (2006). Numerical modelling and data assimilation of the Larsen B ice shelf, Antarctic Peninsula. Philosophical Transactions of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 364(1844):1815-1839. |
op_relation |
https://www.zora.uzh.ch/id/eprint/136409/1/2006_Vieli_1815.full.pdf doi:10.5167/uzh-136409 doi:10.1098/rsta.2006.1800 info:pmid/16782611 urn:issn:1364-503X |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.5167/uzh-13640910.1098/rsta.2006.1800 |
_version_ |
1802647488507674624 |