Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics
At least in conventional hydrostatic ice-sheet models, the numerical error associated with grounding line dynamics can be reduced by modifications to the discretization scheme. These involve altering the integration formulae for the basal traction and/or driving stress close to the grounding line an...
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ftosti:oai:osti.gov:1378355 2023-07-30T03:58:37+02:00 Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics Cornford, S. L. Martin, D. F. Lee, V. Payne, A. J. Ng, E. G. 2023-06-26 application/pdf http://www.osti.gov/servlets/purl/1378355 https://www.osti.gov/biblio/1378355 https://doi.org/10.1017/aog.2016.13 unknown http://www.osti.gov/servlets/purl/1378355 https://www.osti.gov/biblio/1378355 https://doi.org/10.1017/aog.2016.13 doi:10.1017/aog.2016.13 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1017/aog.2016.13 2023-07-11T09:20:35Z At least in conventional hydrostatic ice-sheet models, the numerical error associated with grounding line dynamics can be reduced by modifications to the discretization scheme. These involve altering the integration formulae for the basal traction and/or driving stress close to the grounding line and exhibit lower – if still first-order – error in the MISMIP3d experiments. MISMIP3d may not represent the variety of real ice streams, in that it lacks strong lateral stresses, and imposes a large basal traction at the grounding line. We study resolution sensitivity in the context of extreme forcing simulations of the entire Antarctic ice sheet, using the BISICLES adaptive mesh ice-sheet model with two schemes: the original treatment, and a scheme, which modifies the discretization of the basal traction. The second scheme does indeed improve accuracy – by around a factor of two – for a given mesh spacing, but $\lesssim 1$ km resolution is still necessary. For example, in coarser resolution simulations Thwaites Glacier retreats so slowly that other ice streams divert its trunk. In contrast, with $\lesssim 1$ km meshes, the same glacier retreats far more quickly and triggers the final phase of West Antarctic collapse a century before any such diversion can take place. Other/Unknown Material Antarc* Antarctic Ice Sheet Thwaites Glacier SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Antarctic Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Annals of Glaciology 57 73 1 9 |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Cornford, S. L. Martin, D. F. Lee, V. Payne, A. J. Ng, E. G. Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
At least in conventional hydrostatic ice-sheet models, the numerical error associated with grounding line dynamics can be reduced by modifications to the discretization scheme. These involve altering the integration formulae for the basal traction and/or driving stress close to the grounding line and exhibit lower – if still first-order – error in the MISMIP3d experiments. MISMIP3d may not represent the variety of real ice streams, in that it lacks strong lateral stresses, and imposes a large basal traction at the grounding line. We study resolution sensitivity in the context of extreme forcing simulations of the entire Antarctic ice sheet, using the BISICLES adaptive mesh ice-sheet model with two schemes: the original treatment, and a scheme, which modifies the discretization of the basal traction. The second scheme does indeed improve accuracy – by around a factor of two – for a given mesh spacing, but $\lesssim 1$ km resolution is still necessary. For example, in coarser resolution simulations Thwaites Glacier retreats so slowly that other ice streams divert its trunk. In contrast, with $\lesssim 1$ km meshes, the same glacier retreats far more quickly and triggers the final phase of West Antarctic collapse a century before any such diversion can take place. |
author |
Cornford, S. L. Martin, D. F. Lee, V. Payne, A. J. Ng, E. G. |
author_facet |
Cornford, S. L. Martin, D. F. Lee, V. Payne, A. J. Ng, E. G. |
author_sort |
Cornford, S. L. |
title |
Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics |
title_short |
Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics |
title_full |
Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics |
title_fullStr |
Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics |
title_full_unstemmed |
Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics |
title_sort |
adaptive mesh refinement versus subgrid friction interpolation in simulations of antarctic ice dynamics |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1378355 https://www.osti.gov/biblio/1378355 https://doi.org/10.1017/aog.2016.13 |
long_lat |
ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
Antarctic Thwaites Glacier |
geographic_facet |
Antarctic Thwaites Glacier |
genre |
Antarc* Antarctic Ice Sheet Thwaites Glacier |
genre_facet |
Antarc* Antarctic Ice Sheet Thwaites Glacier |
op_relation |
http://www.osti.gov/servlets/purl/1378355 https://www.osti.gov/biblio/1378355 https://doi.org/10.1017/aog.2016.13 doi:10.1017/aog.2016.13 |
op_doi |
https://doi.org/10.1017/aog.2016.13 |
container_title |
Annals of Glaciology |
container_volume |
57 |
container_issue |
73 |
container_start_page |
1 |
op_container_end_page |
9 |
_version_ |
1772821377832714240 |