Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1)
The use of a boundary-layer parameterization of buttressing and ice flux across grounding lines in a two-dimensional ice-sheet model is improved by allowing general orientations of the grounding line. This and another modification to the model's grounding-line parameterization are assessed in t...
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ftdoajarticles:oai:doaj.org/article:41534eca839b414e9fe0a87d314e73f2 2023-05-15T13:48:18+02:00 Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1) D. Pollard R. M. DeConto 2020-12-01T00:00:00Z https://doi.org/10.5194/gmd-13-6481-2020 https://doaj.org/article/41534eca839b414e9fe0a87d314e73f2 EN eng Copernicus Publications https://gmd.copernicus.org/articles/13/6481/2020/gmd-13-6481-2020.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-13-6481-2020 1991-959X 1991-9603 https://doaj.org/article/41534eca839b414e9fe0a87d314e73f2 Geoscientific Model Development, Vol 13, Pp 6481-6500 (2020) Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/gmd-13-6481-2020 2022-12-31T05:59:16Z The use of a boundary-layer parameterization of buttressing and ice flux across grounding lines in a two-dimensional ice-sheet model is improved by allowing general orientations of the grounding line. This and another modification to the model's grounding-line parameterization are assessed in three settings: rectangular fjord-like domains – the third Marine Ice Sheet Model Intercomparison Project (MISMIP + ) and Marine Ice Sheet Model Intercomparison Project for plan view models (MISMIP3d) – and future simulations of West Antarctic ice retreat under Representative Concentration Pathway (RCP)8.5-based climates. The new modifications are found to have significant effects on the fjord-like results, which are now within the envelopes of other models in the MISMIP + and MISMIP3d intercomparisons. In contrast, the modifications have little effect on West Antarctic retreat, presumably because dynamics in the wider major Antarctic basins are adequately represented by the model's previous simpler one-dimensional formulation. As future grounding lines retreat across very deep bedrock topography in the West Antarctic simulations, buttressing is weak and deviatoric stress measures exceed the ice yield stress, implying that structural failure at these grounding lines would occur. We suggest that these grounding-line quantities should be examined in similar projections by other ice models to better assess the potential for future structural failure. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic Geoscientific Model Development 13 12 6481 6500 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 D. Pollard R. M. DeConto Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1) |
topic_facet |
Geology QE1-996.5 |
description |
The use of a boundary-layer parameterization of buttressing and ice flux across grounding lines in a two-dimensional ice-sheet model is improved by allowing general orientations of the grounding line. This and another modification to the model's grounding-line parameterization are assessed in three settings: rectangular fjord-like domains – the third Marine Ice Sheet Model Intercomparison Project (MISMIP + ) and Marine Ice Sheet Model Intercomparison Project for plan view models (MISMIP3d) – and future simulations of West Antarctic ice retreat under Representative Concentration Pathway (RCP)8.5-based climates. The new modifications are found to have significant effects on the fjord-like results, which are now within the envelopes of other models in the MISMIP + and MISMIP3d intercomparisons. In contrast, the modifications have little effect on West Antarctic retreat, presumably because dynamics in the wider major Antarctic basins are adequately represented by the model's previous simpler one-dimensional formulation. As future grounding lines retreat across very deep bedrock topography in the West Antarctic simulations, buttressing is weak and deviatoric stress measures exceed the ice yield stress, implying that structural failure at these grounding lines would occur. We suggest that these grounding-line quantities should be examined in similar projections by other ice models to better assess the potential for future structural failure. |
format |
Article in Journal/Newspaper |
author |
D. Pollard R. M. DeConto |
author_facet |
D. Pollard R. M. DeConto |
author_sort |
D. Pollard |
title |
Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1) |
title_short |
Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1) |
title_full |
Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1) |
title_fullStr |
Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1) |
title_full_unstemmed |
Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (PSUICE3D v2.1) |
title_sort |
improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations (psuice3d v2.1) |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/gmd-13-6481-2020 https://doaj.org/article/41534eca839b414e9fe0a87d314e73f2 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Geoscientific Model Development, Vol 13, Pp 6481-6500 (2020) |
op_relation |
https://gmd.copernicus.org/articles/13/6481/2020/gmd-13-6481-2020.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-13-6481-2020 1991-959X 1991-9603 https://doaj.org/article/41534eca839b414e9fe0a87d314e73f2 |
op_doi |
https://doi.org/10.5194/gmd-13-6481-2020 |
container_title |
Geoscientific Model Development |
container_volume |
13 |
container_issue |
12 |
container_start_page |
6481 |
op_container_end_page |
6500 |
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1766249083897380864 |