Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model
Due to the lack of direct observations, subglacial hydrology is still marginally considered in Antarctic ice sheet modelling studies, albeit that several approaches exist (e.g. LeBrocq, Bueler and Van Pelt). Subglacial hydrology impacts basal friction through a reduction in effective pressure and th...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/353959 2023-05-15T13:37:12+02:00 Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model Kazmierczak, Elise Coulon, Violaine Zipf, Lars Pattyn, Frank EGU General Assembly Sharing Geosciences (4-8 May 2020: Online) 2020-05-08 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/353959 https://dipot.ulb.ac.be/dspace/bitstream/2013/353959/3/EGU2020-7540_presentation.pdf en eng https://dipot.ulb.ac.be/dspace/bitstream/2013/353959/3/EGU2020-7540_presentation.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/353959 1 full-text file(s): info:eu-repo/semantics/openAccess Glaciologie Climatologie info:eu-repo/semantics/conferenceContribution info:ulb-repo/semantics/conferenceContribution info:ulb-repo/semantics/openurl/document 2020 ftunivbruxelles 2023-01-18T23:21:34Z Due to the lack of direct observations, subglacial hydrology is still marginally considered in Antarctic ice sheet modelling studies, albeit that several approaches exist (e.g. LeBrocq, Bueler and Van Pelt). Subglacial hydrology impacts basal friction through a reduction in effective pressure and through changing properties of subglacial sediments, both factors influencing the lubrication at the bottom of the ice sheet. Several approaches exist to represent subglacial hydrology in ice sheet models (Bueler and Brown, 2009, Goeller et al. 2013) and are generally coupled to either a Coulomb or a Weertman friction law. However, the type of subglacial process determines to a large extent the sensitivity of Antarctic mass change (Sun et al, submitted).In this study we investigate the sensitivity of subglacial dynamics on the behaviour of the Antarctic ice sheet on centennial time scales. For this purpose we employ a subglacial hydrology model for subglacial water routing (Lebrocq et al. 2009) coupled to a thermomechanical ice-sheet model (f.ETISh; Pattyn, 2017). We consider different parametrizations and representations of effective pressure and till water content at the base. We also consider the combination of different friction laws and hydrological models (sheet flow, till deformation) depending on estimates of the subglacial conditions of the Antarctic ice sheet. Results show that the way of coupling subglacial hydrology influences the sensitivity of the ice-sheet system on centennial time scales. However, the type and power of the friction law (Coulomb versus Weertman) has the most dominant impact on ice sheet sensitivity. info:eu-repo/semantics/nonPublished Conference Object Antarc* Antarctic Ice Sheet DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic The Antarctic Weertman ENVELOPE(-67.753,-67.753,-66.972,-66.972) Van Pelt ENVELOPE(35.717,35.717,-71.250,-71.250) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Glaciologie Climatologie |
spellingShingle |
Glaciologie Climatologie Kazmierczak, Elise Coulon, Violaine Zipf, Lars Pattyn, Frank Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model |
topic_facet |
Glaciologie Climatologie |
description |
Due to the lack of direct observations, subglacial hydrology is still marginally considered in Antarctic ice sheet modelling studies, albeit that several approaches exist (e.g. LeBrocq, Bueler and Van Pelt). Subglacial hydrology impacts basal friction through a reduction in effective pressure and through changing properties of subglacial sediments, both factors influencing the lubrication at the bottom of the ice sheet. Several approaches exist to represent subglacial hydrology in ice sheet models (Bueler and Brown, 2009, Goeller et al. 2013) and are generally coupled to either a Coulomb or a Weertman friction law. However, the type of subglacial process determines to a large extent the sensitivity of Antarctic mass change (Sun et al, submitted).In this study we investigate the sensitivity of subglacial dynamics on the behaviour of the Antarctic ice sheet on centennial time scales. For this purpose we employ a subglacial hydrology model for subglacial water routing (Lebrocq et al. 2009) coupled to a thermomechanical ice-sheet model (f.ETISh; Pattyn, 2017). We consider different parametrizations and representations of effective pressure and till water content at the base. We also consider the combination of different friction laws and hydrological models (sheet flow, till deformation) depending on estimates of the subglacial conditions of the Antarctic ice sheet. Results show that the way of coupling subglacial hydrology influences the sensitivity of the ice-sheet system on centennial time scales. However, the type and power of the friction law (Coulomb versus Weertman) has the most dominant impact on ice sheet sensitivity. info:eu-repo/semantics/nonPublished |
author2 |
EGU General Assembly Sharing Geosciences (4-8 May 2020: Online) |
format |
Conference Object |
author |
Kazmierczak, Elise Coulon, Violaine Zipf, Lars Pattyn, Frank |
author_facet |
Kazmierczak, Elise Coulon, Violaine Zipf, Lars Pattyn, Frank |
author_sort |
Kazmierczak, Elise |
title |
Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model |
title_short |
Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model |
title_full |
Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model |
title_fullStr |
Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model |
title_full_unstemmed |
Coupling subglacial hydrology to basal friction in an Antarctic ice sheet model |
title_sort |
coupling subglacial hydrology to basal friction in an antarctic ice sheet model |
publishDate |
2020 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/353959 https://dipot.ulb.ac.be/dspace/bitstream/2013/353959/3/EGU2020-7540_presentation.pdf |
long_lat |
ENVELOPE(-67.753,-67.753,-66.972,-66.972) ENVELOPE(35.717,35.717,-71.250,-71.250) |
geographic |
Antarctic The Antarctic Weertman Van Pelt |
geographic_facet |
Antarctic The Antarctic Weertman Van Pelt |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://dipot.ulb.ac.be/dspace/bitstream/2013/353959/3/EGU2020-7540_presentation.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/353959 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766089210709671936 |