Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets
The drainage of meltwater beneath ice sheets exerts a fundamental control on ice flow variability, by regulating the lubrication of the ice-bed interface, and determining subglacial sediment shear strengths. This thesis investigates meltwater drainage of the Fennoscandian and Barents Sea ice sheets...
Published in: | Quaternary Science Reviews |
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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UiT Norges arktiske universitet
2019
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Online Access: | https://hdl.handle.net/10037/15815 |
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ftunivtroemsoe:oai:munin.uit.no:10037/15815 2023-05-15T14:28:09+02:00 Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets Shackleton, Calvin 2019-06-11 https://hdl.handle.net/10037/15815 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway Paper I: Shackleton, C., Patton, H., Hubbard, A., Winsborrow, M.C.M., Kingslake, J., Esteves, M., Andreassen, K. & Greenwood, S.L. (2018). Subglacial water storage and drainage beneath the Fennoscandian and Barents Sea ice sheets. Quaternary Science Reviews, 201 , 13-28. Also available at https://doi.org/10.1016/j.quascirev.2018.10.007 . Accepted manuscript version available in Munin at https://hdl.handle.net/10037/14088 . Paper II: Shackleton, C., Winsborrow, M.C.M., Andreassen, K., Lucchi, R. & Bjarnadóttir, L.R. Ice margin retreat and grounding-zone dynamics during initial deglaciation of the Storfjordrenna Ice Stream, western Barents Sea. (Submitted manuscript). Paper III: Shackleton, C., Winsborrow, M.C.M., Patton, H., Esteves, M., Bjarnadóttir, L.R. & Andreassen, K. Transitions in subglacial drainage and influences on glacial dynamics in the central Barents Sea, reconstructed from assemblages of meltwater landforms. (Manuscript). Available in the file “thesis_entire.pdf”. info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ 978-82-8236-348-8 (trykt) 978-82-8236-349-5 (pdf) https://hdl.handle.net/10037/15815 openAccess Copyright 2019 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 DOKTOR-004 Doctoral thesis Doktorgradsavhandling 2019 ftunivtroemsoe 2021-06-25T17:56:42Z The drainage of meltwater beneath ice sheets exerts a fundamental control on ice flow variability, by regulating the lubrication of the ice-bed interface, and determining subglacial sediment shear strengths. This thesis investigates meltwater drainage of the Fennoscandian and Barents Sea ice sheets through the combined application of geomorphologically based reconstruction and modelling of subglacial hydraulic pressure potential. Meltwater processes at a wide range of spatial and temporal scales are studied, from drainage patterns at the ice sheet scale over an entire glaciation, to more focussed studies of meltwater and its impacts on ice dynamic behaviour at the ice sheet interior and margins. Hydraulic potential modelling reveals meltwater drainage routes and potential sites for water storage within palaeo-subglacial lakes over the Barents Sea and Fennoscandia. Also, migration paths of ice marginal drainage outlets are predicted throughout deglaciation, highlighting regions of focussed sediment and freshwater delivery to the ice margins. Geomorphological reconstructions reveal iceberg calving characteristics and meltwater dominated deposition at a retreating ice margin south of Svalbard and in the central Barents Sea, glacial and meltwater landforms document highly dynamic drainage systems operating at various stages of ice development. During ice maximum conditions large meltwater conduits supplied water to the beds of downstream ice streams, and evidence for upstream subglacial lakes indicates the potential for cyclic filling and draining, regulating meltwater supply and modulating local and regional ice dynamics. During the later stages of deglaciation when ice was retreating through the central Barents Sea, esker ridges indicate conduits incised into overlying ice, and their morphology and spatial distribution suggests that supraglacial water sources may have connected to the bed and fed basal drainage systems. Doctoral or Postdoctoral Thesis Arctic Barents Sea Fennoscandia Fennoscandian Ice Sheet Sea ice Svalbard University of Tromsø: Munin Open Research Archive Barents Sea Svalbard Quaternary Science Reviews 201 13 28 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 DOKTOR-004 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 DOKTOR-004 Shackleton, Calvin Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 DOKTOR-004 |
description |
The drainage of meltwater beneath ice sheets exerts a fundamental control on ice flow variability, by regulating the lubrication of the ice-bed interface, and determining subglacial sediment shear strengths. This thesis investigates meltwater drainage of the Fennoscandian and Barents Sea ice sheets through the combined application of geomorphologically based reconstruction and modelling of subglacial hydraulic pressure potential. Meltwater processes at a wide range of spatial and temporal scales are studied, from drainage patterns at the ice sheet scale over an entire glaciation, to more focussed studies of meltwater and its impacts on ice dynamic behaviour at the ice sheet interior and margins. Hydraulic potential modelling reveals meltwater drainage routes and potential sites for water storage within palaeo-subglacial lakes over the Barents Sea and Fennoscandia. Also, migration paths of ice marginal drainage outlets are predicted throughout deglaciation, highlighting regions of focussed sediment and freshwater delivery to the ice margins. Geomorphological reconstructions reveal iceberg calving characteristics and meltwater dominated deposition at a retreating ice margin south of Svalbard and in the central Barents Sea, glacial and meltwater landforms document highly dynamic drainage systems operating at various stages of ice development. During ice maximum conditions large meltwater conduits supplied water to the beds of downstream ice streams, and evidence for upstream subglacial lakes indicates the potential for cyclic filling and draining, regulating meltwater supply and modulating local and regional ice dynamics. During the later stages of deglaciation when ice was retreating through the central Barents Sea, esker ridges indicate conduits incised into overlying ice, and their morphology and spatial distribution suggests that supraglacial water sources may have connected to the bed and fed basal drainage systems. |
format |
Doctoral or Postdoctoral Thesis |
author |
Shackleton, Calvin |
author_facet |
Shackleton, Calvin |
author_sort |
Shackleton, Calvin |
title |
Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets |
title_short |
Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets |
title_full |
Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets |
title_fullStr |
Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets |
title_full_unstemmed |
Subglacial hydrology of the Fennoscandian and Barents Sea ice sheets |
title_sort |
subglacial hydrology of the fennoscandian and barents sea ice sheets |
publisher |
UiT Norges arktiske universitet |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/15815 |
geographic |
Barents Sea Svalbard |
geographic_facet |
Barents Sea Svalbard |
genre |
Arctic Barents Sea Fennoscandia Fennoscandian Ice Sheet Sea ice Svalbard |
genre_facet |
Arctic Barents Sea Fennoscandia Fennoscandian Ice Sheet Sea ice Svalbard |
op_relation |
Paper I: Shackleton, C., Patton, H., Hubbard, A., Winsborrow, M.C.M., Kingslake, J., Esteves, M., Andreassen, K. & Greenwood, S.L. (2018). Subglacial water storage and drainage beneath the Fennoscandian and Barents Sea ice sheets. Quaternary Science Reviews, 201 , 13-28. Also available at https://doi.org/10.1016/j.quascirev.2018.10.007 . Accepted manuscript version available in Munin at https://hdl.handle.net/10037/14088 . Paper II: Shackleton, C., Winsborrow, M.C.M., Andreassen, K., Lucchi, R. & Bjarnadóttir, L.R. Ice margin retreat and grounding-zone dynamics during initial deglaciation of the Storfjordrenna Ice Stream, western Barents Sea. (Submitted manuscript). Paper III: Shackleton, C., Winsborrow, M.C.M., Patton, H., Esteves, M., Bjarnadóttir, L.R. & Andreassen, K. Transitions in subglacial drainage and influences on glacial dynamics in the central Barents Sea, reconstructed from assemblages of meltwater landforms. (Manuscript). Available in the file “thesis_entire.pdf”. info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ 978-82-8236-348-8 (trykt) 978-82-8236-349-5 (pdf) https://hdl.handle.net/10037/15815 |
op_rights |
openAccess Copyright 2019 The Author(s) |
container_title |
Quaternary Science Reviews |
container_volume |
201 |
container_start_page |
13 |
op_container_end_page |
28 |
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1766302317629407232 |