Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise
We assess the effect of enhanced basal sliding on the flow and mass budget of the Greenland ice sheet, using a newly developed parameterization of the relation between meltwater runoff and ice flow. A wide range of observations suggest that water generated by melt at the surface of the ice sheet rea...
Published in: | Proceedings of the National Academy of Sciences |
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Main Authors: | , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2013
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Online Access: | https://hdl.handle.net/1983/a3181ceb-0c8a-4bc2-b05b-3dfeba647a6e https://research-information.bris.ac.uk/en/publications/a3181ceb-0c8a-4bc2-b05b-3dfeba647a6e https://doi.org/10.1073/pnas.1212647110 http://dbms.ilrt.bris.ac.uk/media/user/162431/Shannon_et_al_2013_PNAS.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/a3181ceb-0c8a-4bc2-b05b-3dfeba647a6e 2024-01-28T10:06:08+01:00 Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise Shannon, Sarah R Payne, A J Bartholomew, Ian van den Broeke, Michiel Edwards, Tamsin L Fettweis, Xavier Gagliardini, Olivier Gillet-Chaulet, Fabien Goelzer, Heiko Hoffman, Matthew Huybrechts, Philippe Mair, Douglas Nienow, Peter Perego, Mauro Price, Stephen Smeets, Paul Sole, Andrew van de Wal, Roderik Zwinger, Thomas 2013-08-27 https://hdl.handle.net/1983/a3181ceb-0c8a-4bc2-b05b-3dfeba647a6e https://research-information.bris.ac.uk/en/publications/a3181ceb-0c8a-4bc2-b05b-3dfeba647a6e https://doi.org/10.1073/pnas.1212647110 http://dbms.ilrt.bris.ac.uk/media/user/162431/Shannon_et_al_2013_PNAS.pdf eng eng info:eu-repo/semantics/restrictedAccess Shannon , S R , Payne , A J , Bartholomew , I , van den Broeke , M , Edwards , T L , Fettweis , X , Gagliardini , O , Gillet-Chaulet , F , Goelzer , H , Hoffman , M , Huybrechts , P , Mair , D , Nienow , P , Perego , M , Price , S , Smeets , P , Sole , A , van de Wal , R & Zwinger , T 2013 , ' Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 110 , no. 35 , pp. 14156-14161 . https://doi.org/10.1073/pnas.1212647110 article 2013 ftubristolcris https://doi.org/10.1073/pnas.1212647110 2024-01-04T23:40:10Z We assess the effect of enhanced basal sliding on the flow and mass budget of the Greenland ice sheet, using a newly developed parameterization of the relation between meltwater runoff and ice flow. A wide range of observations suggest that water generated by melt at the surface of the ice sheet reaches its bed by both fracture and drainage through moulins. Once at the bed, this water is likely to affect lubrication, although current observations are insufficient to determine whether changes in subglacial hydraulics will limit the potential for the speedup of flow. An uncertainty analysis based on our best-fit parameterization admits both possibilities: continuously increasing or bounded lubrication. We apply the parameterization to four higher-order ice-sheet models in a series of experiments forced by changes in both lubrication and surface mass budget and determine the additional mass loss brought about by lubrication in comparison with experiments forced only by changes in surface mass balance. We use forcing from a regional climate model, itself forced by output from the European Centre Hamburg Model (ECHAM5) global climate model run under scenario A1B. Although changes in lubrication generate widespread effects on the flow and form of the ice sheet, they do not affect substantial net mass loss; increase in the ice sheet’s contribution to sea-level rise from basal lubrication is projected by all models to be no more than 5% of the contribution from surface mass budget forcing alone. Article in Journal/Newspaper Greenland Ice Sheet University of Bristol: Bristol Research Greenland Proceedings of the National Academy of Sciences 110 35 14156 14161 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
We assess the effect of enhanced basal sliding on the flow and mass budget of the Greenland ice sheet, using a newly developed parameterization of the relation between meltwater runoff and ice flow. A wide range of observations suggest that water generated by melt at the surface of the ice sheet reaches its bed by both fracture and drainage through moulins. Once at the bed, this water is likely to affect lubrication, although current observations are insufficient to determine whether changes in subglacial hydraulics will limit the potential for the speedup of flow. An uncertainty analysis based on our best-fit parameterization admits both possibilities: continuously increasing or bounded lubrication. We apply the parameterization to four higher-order ice-sheet models in a series of experiments forced by changes in both lubrication and surface mass budget and determine the additional mass loss brought about by lubrication in comparison with experiments forced only by changes in surface mass balance. We use forcing from a regional climate model, itself forced by output from the European Centre Hamburg Model (ECHAM5) global climate model run under scenario A1B. Although changes in lubrication generate widespread effects on the flow and form of the ice sheet, they do not affect substantial net mass loss; increase in the ice sheet’s contribution to sea-level rise from basal lubrication is projected by all models to be no more than 5% of the contribution from surface mass budget forcing alone. |
format |
Article in Journal/Newspaper |
author |
Shannon, Sarah R Payne, A J Bartholomew, Ian van den Broeke, Michiel Edwards, Tamsin L Fettweis, Xavier Gagliardini, Olivier Gillet-Chaulet, Fabien Goelzer, Heiko Hoffman, Matthew Huybrechts, Philippe Mair, Douglas Nienow, Peter Perego, Mauro Price, Stephen Smeets, Paul Sole, Andrew van de Wal, Roderik Zwinger, Thomas |
spellingShingle |
Shannon, Sarah R Payne, A J Bartholomew, Ian van den Broeke, Michiel Edwards, Tamsin L Fettweis, Xavier Gagliardini, Olivier Gillet-Chaulet, Fabien Goelzer, Heiko Hoffman, Matthew Huybrechts, Philippe Mair, Douglas Nienow, Peter Perego, Mauro Price, Stephen Smeets, Paul Sole, Andrew van de Wal, Roderik Zwinger, Thomas Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise |
author_facet |
Shannon, Sarah R Payne, A J Bartholomew, Ian van den Broeke, Michiel Edwards, Tamsin L Fettweis, Xavier Gagliardini, Olivier Gillet-Chaulet, Fabien Goelzer, Heiko Hoffman, Matthew Huybrechts, Philippe Mair, Douglas Nienow, Peter Perego, Mauro Price, Stephen Smeets, Paul Sole, Andrew van de Wal, Roderik Zwinger, Thomas |
author_sort |
Shannon, Sarah R |
title |
Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise |
title_short |
Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise |
title_full |
Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise |
title_fullStr |
Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise |
title_full_unstemmed |
Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise |
title_sort |
enhanced basal lubrication and the contribution of the greenland ice sheet to future sea-level rise |
publishDate |
2013 |
url |
https://hdl.handle.net/1983/a3181ceb-0c8a-4bc2-b05b-3dfeba647a6e https://research-information.bris.ac.uk/en/publications/a3181ceb-0c8a-4bc2-b05b-3dfeba647a6e https://doi.org/10.1073/pnas.1212647110 http://dbms.ilrt.bris.ac.uk/media/user/162431/Shannon_et_al_2013_PNAS.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Shannon , S R , Payne , A J , Bartholomew , I , van den Broeke , M , Edwards , T L , Fettweis , X , Gagliardini , O , Gillet-Chaulet , F , Goelzer , H , Hoffman , M , Huybrechts , P , Mair , D , Nienow , P , Perego , M , Price , S , Smeets , P , Sole , A , van de Wal , R & Zwinger , T 2013 , ' Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 110 , no. 35 , pp. 14156-14161 . https://doi.org/10.1073/pnas.1212647110 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1073/pnas.1212647110 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
110 |
container_issue |
35 |
container_start_page |
14156 |
op_container_end_page |
14161 |
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1789332817615781888 |