Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology
Ice-stream dynamics are strongly controlled by processes taking place at the ice/bed interface where subglacial water both lubricates the base and saturates any existing, underlying sediment. Large parts of the former Eurasian ice sheet were underlain by thick sequences of soft, marine sediments and...
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Online Access: | https://hdl.handle.net/10037/12362 https://doi.org/10.1017/jog.2017.21 |
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ftunivtroemsoe:oai:munin.uit.no:10037/12362 2023-05-15T14:27:52+02:00 Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology Gudlaugsson, Eythor Humbert, Angelika Andreassen, Karin Clason, Caroline C. Kleiner, Thomas Beyer, Sebastian 2017-04-24 https://hdl.handle.net/10037/12362 https://doi.org/10.1017/jog.2017.21 eng eng Cambridge University Press Gudlaugsson, E. (2015). Modelling the subglacial hydrology of the former Barents Sea Ice Sheet. (Doctoral thesis). https://hdl.handle.net/10037/25064 Journal of Glaciology Norges forskningsråd: 223259 info:eu-repo/grantAgreement/RCN/PETROMAKS2/200672/Norway/Glaciations in the Barents Sea area// info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Gudlaugsson, E., Humbert, A., Andreassen, K., Clason, C.C., Kleiner, T. & Beyer, S. (2017). Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology. Journal of Glaciology, 63(239), 556-564. FRIDAID 1474377 doi:10.1017/jog.2017.21 0022-1430 1727-5652 https://hdl.handle.net/10037/12362 openAccess glacier hydrology ice dynamics ice-sheet modelling subglacial lakes VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.1017/jog.2017.21 2022-05-11T22:58:43Z Ice-stream dynamics are strongly controlled by processes taking place at the ice/bed interface where subglacial water both lubricates the base and saturates any existing, underlying sediment. Large parts of the former Eurasian ice sheet were underlain by thick sequences of soft, marine sediments and many areas are imprinted with geomorphological features indicative of fast flow and wet basal conditions. Here, we study the effect of subglacial water on past Eurasian ice-sheet dynamics by incorporating a thin-film model of basal water flow into the ice-sheet model SICOPOLIS and use it to better represent flow in temperate areas. The adjunction of subglacial hydrology results in a smaller ice-sheet building up over time and generally faster ice velocities, which consequently reduces the total area fraction of temperate basal ice and ice streaming areas. Minima in the hydraulic pressure potential, governing water flow, are used as indicators for potential locations of past subglacial lakes and a probability distribution of lake existence is presented based on estimated lake depth and longevity. Article in Journal/Newspaper Arctic Ice Sheet Journal of Glaciology University of Tromsø: Munin Open Research Archive Journal of Glaciology 63 239 556 564 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
glacier hydrology ice dynamics ice-sheet modelling subglacial lakes VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
spellingShingle |
glacier hydrology ice dynamics ice-sheet modelling subglacial lakes VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Gudlaugsson, Eythor Humbert, Angelika Andreassen, Karin Clason, Caroline C. Kleiner, Thomas Beyer, Sebastian Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
topic_facet |
glacier hydrology ice dynamics ice-sheet modelling subglacial lakes VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
Ice-stream dynamics are strongly controlled by processes taking place at the ice/bed interface where subglacial water both lubricates the base and saturates any existing, underlying sediment. Large parts of the former Eurasian ice sheet were underlain by thick sequences of soft, marine sediments and many areas are imprinted with geomorphological features indicative of fast flow and wet basal conditions. Here, we study the effect of subglacial water on past Eurasian ice-sheet dynamics by incorporating a thin-film model of basal water flow into the ice-sheet model SICOPOLIS and use it to better represent flow in temperate areas. The adjunction of subglacial hydrology results in a smaller ice-sheet building up over time and generally faster ice velocities, which consequently reduces the total area fraction of temperate basal ice and ice streaming areas. Minima in the hydraulic pressure potential, governing water flow, are used as indicators for potential locations of past subglacial lakes and a probability distribution of lake existence is presented based on estimated lake depth and longevity. |
format |
Article in Journal/Newspaper |
author |
Gudlaugsson, Eythor Humbert, Angelika Andreassen, Karin Clason, Caroline C. Kleiner, Thomas Beyer, Sebastian |
author_facet |
Gudlaugsson, Eythor Humbert, Angelika Andreassen, Karin Clason, Caroline C. Kleiner, Thomas Beyer, Sebastian |
author_sort |
Gudlaugsson, Eythor |
title |
Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
title_short |
Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
title_full |
Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
title_fullStr |
Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
title_full_unstemmed |
Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
title_sort |
eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
publisher |
Cambridge University Press |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/12362 https://doi.org/10.1017/jog.2017.21 |
genre |
Arctic Ice Sheet Journal of Glaciology |
genre_facet |
Arctic Ice Sheet Journal of Glaciology |
op_relation |
Gudlaugsson, E. (2015). Modelling the subglacial hydrology of the former Barents Sea Ice Sheet. (Doctoral thesis). https://hdl.handle.net/10037/25064 Journal of Glaciology Norges forskningsråd: 223259 info:eu-repo/grantAgreement/RCN/PETROMAKS2/200672/Norway/Glaciations in the Barents Sea area// info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Gudlaugsson, E., Humbert, A., Andreassen, K., Clason, C.C., Kleiner, T. & Beyer, S. (2017). Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology. Journal of Glaciology, 63(239), 556-564. FRIDAID 1474377 doi:10.1017/jog.2017.21 0022-1430 1727-5652 https://hdl.handle.net/10037/12362 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1017/jog.2017.21 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
239 |
container_start_page |
556 |
op_container_end_page |
564 |
_version_ |
1766301924340006912 |