A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.

Antarctic subglacial conditions can be elucidated through several techniques. However, since direct measurements are only limited to a few deep drillings to the bed, there is always a substantial amount of ice sheet and thermodynamical modeling involved. This can either be done based on a fully coup...

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Main Authors: Van Liefferinge, Brice, Pattyn, Frank
Other Authors: Geologica Belgica 4th International Geologica Belgica Meeting 2012 (2012-09-11/14: Brussels (Belgium))
Format: Conference Object
Language:English
Published: 2012
Subjects:
Online Access:http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/151306
https://dipot.ulb.ac.be/dspace/bitstream/2013/151306/1/GB2012.pdf
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spelling ftunivbruxelles:oai:dipot.ulb.ac.be:2013/151306 2023-05-15T13:37:29+02:00 A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise. Van Liefferinge, Brice Pattyn, Frank Geologica Belgica 4th International Geologica Belgica Meeting 2012 (2012-09-11/14: Brussels (Belgium)) 2012-09-11 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/151306 https://dipot.ulb.ac.be/dspace/bitstream/2013/151306/1/GB2012.pdf en eng https://dipot.ulb.ac.be/dspace/bitstream/2013/151306/1/GB2012.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/151306 1 full-text file(s): info:eu-repo/semantics/openAccess Glaciologie info:eu-repo/semantics/conferencePoster info:ulb-repo/semantics/conferencePoster info:ulb-repo/semantics/openurl/document 2012 ftunivbruxelles 2022-06-12T22:09:17Z Antarctic subglacial conditions can be elucidated through several techniques. However, since direct measurements are only limited to a few deep drillings to the bed, there is always a substantial amount of ice sheet and thermodynamical modeling involved. This can either be done based on a fully coupled thermomechanical ice sheet model, or a thermodynamical model coupled to present-day ice sheet geometry and environmental conditions. The latter technique was recently employed by Pattyn (2010) in an attempt to determine the likelihood of basal temperate conditions of the Antarctic ice sheet using a series of existing datasets on mass balance and geothermal heat flux. Here, we made an update of this estimate using new data on bedrock elevation and ice thickness (ALBMAP; Le Brocq et Al. 2010) and observed surface velocities obtained from interferometric analysis (Rignot et Al. 2011). The latter were further constrained by a hybrid ice sheet/ice shelf model to correct for the interior ice flow (where error of observations are to high) and for correcting the ice flow across subglacial lakes. We coupled the model with a new lake inventory from Wright et Al. (in review) to improve the contribution of the geothermal heat flux to the temperature. This revised calculation of the temperature allows us to improve our knowledge of basal melting and its contribution to present-day sea-level rise.Le Brocq, A. Payne, A. Vieli, A. 2010, An improved Antarctic dataset for high resolution numerical ice sheet models (ALBMAP V1), Earth Syst. Sci. Data Discuss. 3, 195-230.Pattyn, F. 2010, Antarctic subglacial conditions inferred from a hybrid ice sheet/ice stream model, Earth Planet. Sci. Lett. 295, 451-461.Rignot, E. Mouginot, J. Scheuchl, B. 2011, Ice Flow of the Antarctic Ice Sheet, Science 333, 1427-1429.Wright, A. and Siegert, M. (in review), A fourth inventory of Antarctic subglacial lakes. info:eu-repo/semantics/nonPublished Conference Object Antarc* Antarctic Ice Sheet Ice Shelf DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic New Lake ENVELOPE(-109.468,-109.468,62.684,62.684) Payne ENVELOPE(167.867,167.867,-72.817,-72.817) The Antarctic
institution Open Polar
collection DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
op_collection_id ftunivbruxelles
language English
topic Glaciologie
spellingShingle Glaciologie
Van Liefferinge, Brice
Pattyn, Frank
A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.
topic_facet Glaciologie
description Antarctic subglacial conditions can be elucidated through several techniques. However, since direct measurements are only limited to a few deep drillings to the bed, there is always a substantial amount of ice sheet and thermodynamical modeling involved. This can either be done based on a fully coupled thermomechanical ice sheet model, or a thermodynamical model coupled to present-day ice sheet geometry and environmental conditions. The latter technique was recently employed by Pattyn (2010) in an attempt to determine the likelihood of basal temperate conditions of the Antarctic ice sheet using a series of existing datasets on mass balance and geothermal heat flux. Here, we made an update of this estimate using new data on bedrock elevation and ice thickness (ALBMAP; Le Brocq et Al. 2010) and observed surface velocities obtained from interferometric analysis (Rignot et Al. 2011). The latter were further constrained by a hybrid ice sheet/ice shelf model to correct for the interior ice flow (where error of observations are to high) and for correcting the ice flow across subglacial lakes. We coupled the model with a new lake inventory from Wright et Al. (in review) to improve the contribution of the geothermal heat flux to the temperature. This revised calculation of the temperature allows us to improve our knowledge of basal melting and its contribution to present-day sea-level rise.Le Brocq, A. Payne, A. Vieli, A. 2010, An improved Antarctic dataset for high resolution numerical ice sheet models (ALBMAP V1), Earth Syst. Sci. Data Discuss. 3, 195-230.Pattyn, F. 2010, Antarctic subglacial conditions inferred from a hybrid ice sheet/ice stream model, Earth Planet. Sci. Lett. 295, 451-461.Rignot, E. Mouginot, J. Scheuchl, B. 2011, Ice Flow of the Antarctic Ice Sheet, Science 333, 1427-1429.Wright, A. and Siegert, M. (in review), A fourth inventory of Antarctic subglacial lakes. info:eu-repo/semantics/nonPublished
author2 Geologica Belgica 4th International Geologica Belgica Meeting 2012 (2012-09-11/14: Brussels (Belgium))
format Conference Object
author Van Liefferinge, Brice
Pattyn, Frank
author_facet Van Liefferinge, Brice
Pattyn, Frank
author_sort Van Liefferinge, Brice
title A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.
title_short A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.
title_full A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.
title_fullStr A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.
title_full_unstemmed A revised evaluation of Antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.
title_sort revised evaluation of antarctic subglacial conditions and the contribution of basal melt to present day sea-level rise.
publishDate 2012
url http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/151306
https://dipot.ulb.ac.be/dspace/bitstream/2013/151306/1/GB2012.pdf
long_lat ENVELOPE(-109.468,-109.468,62.684,62.684)
ENVELOPE(167.867,167.867,-72.817,-72.817)
geographic Antarctic
New Lake
Payne
The Antarctic
geographic_facet Antarctic
New Lake
Payne
The Antarctic
genre Antarc*
Antarctic
Ice Sheet
Ice Shelf
genre_facet Antarc*
Antarctic
Ice Sheet
Ice Shelf
op_relation https://dipot.ulb.ac.be/dspace/bitstream/2013/151306/1/GB2012.pdf
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/151306
op_rights 1 full-text file(s): info:eu-repo/semantics/openAccess
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