Dynamic response of Antarctic ice shelves to bedrock uncertainty
Accurate and extensive bedrock geometry data is essential in ice sheet modelling. The shape of the bedrock on fine scales can influence ice sheet evolution, for example through the formation of pinning points that alter grounding line dynamics. Here we test the sensitivity of the BISICLES adaptive m...
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ftdoajarticles:oai:doaj.org/article:f7fe20768c3f4e43b7ea40ca41590026 2023-05-15T13:22:03+02:00 Dynamic response of Antarctic ice shelves to bedrock uncertainty S. Sun S. L. Cornford Y. Liu J. C. Moore 2014-08-01T00:00:00Z https://doi.org/10.5194/tc-8-1561-2014 https://doaj.org/article/f7fe20768c3f4e43b7ea40ca41590026 EN eng Copernicus Publications http://www.the-cryosphere.net/8/1561/2014/tc-8-1561-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1561-2014 https://doaj.org/article/f7fe20768c3f4e43b7ea40ca41590026 The Cryosphere, Vol 8, Iss 4, Pp 1561-1576 (2014) Environmental sciences GE1-350 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/tc-8-1561-2014 2022-12-31T10:34:33Z Accurate and extensive bedrock geometry data is essential in ice sheet modelling. The shape of the bedrock on fine scales can influence ice sheet evolution, for example through the formation of pinning points that alter grounding line dynamics. Here we test the sensitivity of the BISICLES adaptive mesh ice sheet model to small-amplitude height fluctuations on different spatial scales in the bedrock topography provided by Bedmap2 in the catchments of Pine Island Glacier, the Amery Ice shelf and a region of East Antarctica including the Aurora Basin, Law Dome and Totten Glacier. We generate an ensemble of bedrock topographies by adding random noise to the Bedmap2 data with amplitude determined by the accompanying estimates of bedrock uncertainty. We find that the small-amplitude fluctuations result in only minor changes in the way these glaciers evolve. However, lower-frequency noise, with a broad spatial scale (over tens of kilometres) is more important than higher-frequency noise even when the features have the same height amplitudes and the total noise power is maintained. This is cause for optimism regarding credible sea level rise estimates with presently achievable density of thickness measurements. Pine Island Glacier and the region around Totten Glacier and Law Dome undergo substantial retreat and appear to be more sensitive to errors in bed topography than the Amery Ice shelf region which remains stable under the present-day observational data uncertainty. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Glacier The Cryosphere Totten Glacier Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) The Cryosphere 8 4 1561 1576 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 S. Sun S. L. Cornford Y. Liu J. C. Moore Dynamic response of Antarctic ice shelves to bedrock uncertainty |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Accurate and extensive bedrock geometry data is essential in ice sheet modelling. The shape of the bedrock on fine scales can influence ice sheet evolution, for example through the formation of pinning points that alter grounding line dynamics. Here we test the sensitivity of the BISICLES adaptive mesh ice sheet model to small-amplitude height fluctuations on different spatial scales in the bedrock topography provided by Bedmap2 in the catchments of Pine Island Glacier, the Amery Ice shelf and a region of East Antarctica including the Aurora Basin, Law Dome and Totten Glacier. We generate an ensemble of bedrock topographies by adding random noise to the Bedmap2 data with amplitude determined by the accompanying estimates of bedrock uncertainty. We find that the small-amplitude fluctuations result in only minor changes in the way these glaciers evolve. However, lower-frequency noise, with a broad spatial scale (over tens of kilometres) is more important than higher-frequency noise even when the features have the same height amplitudes and the total noise power is maintained. This is cause for optimism regarding credible sea level rise estimates with presently achievable density of thickness measurements. Pine Island Glacier and the region around Totten Glacier and Law Dome undergo substantial retreat and appear to be more sensitive to errors in bed topography than the Amery Ice shelf region which remains stable under the present-day observational data uncertainty. |
format |
Article in Journal/Newspaper |
author |
S. Sun S. L. Cornford Y. Liu J. C. Moore |
author_facet |
S. Sun S. L. Cornford Y. Liu J. C. Moore |
author_sort |
S. Sun |
title |
Dynamic response of Antarctic ice shelves to bedrock uncertainty |
title_short |
Dynamic response of Antarctic ice shelves to bedrock uncertainty |
title_full |
Dynamic response of Antarctic ice shelves to bedrock uncertainty |
title_fullStr |
Dynamic response of Antarctic ice shelves to bedrock uncertainty |
title_full_unstemmed |
Dynamic response of Antarctic ice shelves to bedrock uncertainty |
title_sort |
dynamic response of antarctic ice shelves to bedrock uncertainty |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1561-2014 https://doaj.org/article/f7fe20768c3f4e43b7ea40ca41590026 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(112.833,112.833,-66.733,-66.733) ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
Antarctic East Antarctica Amery Amery Ice Shelf Pine Island Glacier Law Dome Totten Glacier |
geographic_facet |
Antarctic East Antarctica Amery Amery Ice Shelf Pine Island Glacier Law Dome Totten Glacier |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Glacier The Cryosphere Totten Glacier |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Pine Island Pine Island Glacier The Cryosphere Totten Glacier |
op_source |
The Cryosphere, Vol 8, Iss 4, Pp 1561-1576 (2014) |
op_relation |
http://www.the-cryosphere.net/8/1561/2014/tc-8-1561-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1561-2014 https://doaj.org/article/f7fe20768c3f4e43b7ea40ca41590026 |
op_doi |
https://doi.org/10.5194/tc-8-1561-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1561 |
op_container_end_page |
1576 |
_version_ |
1766363067673739264 |