Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics
Abstract
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.
- Authors:
-
- Univ. of Bristol, Bristol (United Kingdom)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1378355
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Annals of Glaciology
- Additional Journal Information:
- Journal Volume: 57; Journal Issue: 73; Journal ID: ISSN 0260-3055
- Publisher:
- International Glaciological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; ice dynamics; ice streams; ice-sheet modelling
Citation Formats
Cornford, S. L., Martin, D. F., Lee, V., Payne, A. J., and Ng, E. G. Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics. United States: N. p., 2016.
Web. doi:10.1017/aog.2016.13.
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. United States. https://doi.org/10.1017/aog.2016.13
Cornford, S. L., Martin, D. F., Lee, V., Payne, A. J., and Ng, E. G. Fri .
"Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics". United States. https://doi.org/10.1017/aog.2016.13. https://www.osti.gov/servlets/purl/1378355.
@article{osti_1378355,
title = {Adaptive mesh refinement versus subgrid friction interpolation in simulations of Antarctic ice dynamics},
author = {Cornford, S. L. and Martin, D. F. and Lee, V. and Payne, A. J. and Ng, E. G.},
abstractNote = {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.},
doi = {10.1017/aog.2016.13},
journal = {Annals of Glaciology},
number = 73,
volume = 57,
place = {United States},
year = {Fri May 13 00:00:00 EDT 2016},
month = {Fri May 13 00:00:00 EDT 2016}
}
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