Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology
ABSTRACT 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 sedi...
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Online Access: | http://dx.doi.org/10.1017/jog.2017.21 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000211 |
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crcambridgeupr:10.1017/jog.2017.21 2024-03-03T08:45:22+00:00 Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology GUDLAUGSSON, EYTHOR HUMBERT, ANGELIKA ANDREASSEN, KARIN CLASON, CAROLINE C. KLEINER, THOMAS BEYER, SEBASTIAN 2017 http://dx.doi.org/10.1017/jog.2017.21 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000211 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 63, issue 239, page 556-564 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2017 crcambridgeupr https://doi.org/10.1017/jog.2017.21 2024-02-08T08:31:59Z ABSTRACT 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 Ice Sheet Journal of Glaciology Cambridge University Press Journal of Glaciology 63 239 556 564 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes GUDLAUGSSON, EYTHOR HUMBERT, ANGELIKA ANDREASSEN, KARIN CLASON, CAROLINE C. KLEINER, THOMAS BEYER, SEBASTIAN Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT 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 (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/jog.2017.21 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000211 |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 63, issue 239, page 556-564 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
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_ |
1792500918297559040 |