Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics
© The Author(s) 2016. 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...
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ftcdlib:qt7wt941j9 2023-05-15T13:29:44+02:00 Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics Cornford, SL Martin, DF Lee, V Payne, AJ Ng, EG 1 - 9 2016-09-01 application/pdf http://www.escholarship.org/uc/item/7wt941j9 english eng eScholarship, University of California qt7wt941j9 http://www.escholarship.org/uc/item/7wt941j9 public Cornford, SL; Martin, DF; Lee, V; Payne, AJ; & Ng, EG. (2016). Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics. Annals of Glaciology, 57(73), 1 - 9. doi:10.1017/aog.2016.13. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/7wt941j9 article 2016 ftcdlib https://doi.org/10.1017/aog.2016.13 2019-04-12T22:51:49Z © The Author(s) 2016. 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 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 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. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Ice Sheet Thwaites Glacier University of California: eScholarship 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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University of California: eScholarship |
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English |
description |
© The Author(s) 2016. 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 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 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. |
format |
Article in Journal/Newspaper |
author |
Cornford, SL Martin, DF Lee, V Payne, AJ Ng, EG |
spellingShingle |
Cornford, SL Martin, DF Lee, V Payne, AJ Ng, EG Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics |
author_facet |
Cornford, SL Martin, DF Lee, V Payne, AJ Ng, EG |
author_sort |
Cornford, SL |
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 |
publisher |
eScholarship, University of California |
publishDate |
2016 |
url |
http://www.escholarship.org/uc/item/7wt941j9 |
op_coverage |
1 - 9 |
long_lat |
ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
Antarctic Thwaites Glacier |
geographic_facet |
Antarctic Thwaites Glacier |
genre |
Annals of Glaciology Antarc* Antarctic Ice Sheet Thwaites Glacier |
genre_facet |
Annals of Glaciology Antarc* Antarctic Ice Sheet Thwaites Glacier |
op_source |
Cornford, SL; Martin, DF; Lee, V; Payne, AJ; & Ng, EG. (2016). Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics. Annals of Glaciology, 57(73), 1 - 9. doi:10.1017/aog.2016.13. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/7wt941j9 |
op_relation |
qt7wt941j9 http://www.escholarship.org/uc/item/7wt941j9 |
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public |
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 |
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1766002480652484608 |