Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet
The papers of this thesis are not available in Munin: 1. Rüther, D.C., Bjarnadóttir, L.R., Junttila, J., Husum, K., Rasmussen, T.L., Lucchi, R.G. and Andreassen, K.: 'Pattern and timing of the north-western Barents Sea Ice Sheet deglaciation and indications of episodic Holocene deposition'...
Main Author: | |
---|---|
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
Universitetet i Tromsø
2012
|
Subjects: | |
Online Access: | https://hdl.handle.net/10037/5146 |
id |
ftunivtroemsoe:oai:munin.uit.no:10037/5146 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 deglaciation Barents Sea marine geophysics ice stream grounding zone tunnel valley ATB stagnation meltwater geomorphology stratigraphy seismic chirp multibeam swath bathymetry |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 deglaciation Barents Sea marine geophysics ice stream grounding zone tunnel valley ATB stagnation meltwater geomorphology stratigraphy seismic chirp multibeam swath bathymetry Bjarnadottir, Lilja Run Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 deglaciation Barents Sea marine geophysics ice stream grounding zone tunnel valley ATB stagnation meltwater geomorphology stratigraphy seismic chirp multibeam swath bathymetry |
description |
The papers of this thesis are not available in Munin: 1. Rüther, D.C., Bjarnadóttir, L.R., Junttila, J., Husum, K., Rasmussen, T.L., Lucchi, R.G. and Andreassen, K.: 'Pattern and timing of the north-western Barents Sea Ice Sheet deglaciation and indications of episodic Holocene deposition', Boreas (2012), vol. 41(3):494-512. Available at http://dx.doi.org/10.1111/j.1502-3885.2011.00244.x 2. Bjarnadóttir, L.R., Rüther, D.C., Winsborrow, M.C.M. and Andreassen, K.: 'Grounding line dynamics of the Kveithola ice stream, W Barents Sea, as identified from seabed geomorphology and shallow seismic stratigraphy', Boreas (2013), vol. 42(1):84–107. Available at http://dx.doi.org/10.1111/j.1502-3885.2012.00273.x 3. Bjarnadóttir, L.R., Winsborrow, M.C.M. and Andreassen, K.: 'Tunnel valleys in the Barents Sea' (manuscript) 4. Andreassen, K., Winsborrow, M.C.M., Bjarnadóttir, L.R. and Rüther, D.C.: 'Landform assemblage from the collapse of the Bjørnøyrenna palaeo-ice stream, northern Barents Sea' (manuscript) 5. Bjarnadóttir, L.R., Winsborrow, M.C. and Andreassen, K.: 'Deglaciation of the central Barents Sea' (manuscript) The main objective of this PhD thesis was to reconstruct the pattern and main processes of the last deglaciation of the Barents Sea Ice Sheet. The thesis consists of an introductory part and five papers. The conclusions presented in the papers were based on data acquired with a suite of marine geophysical and geological methods, including multibeam-swath bathymetry data, chirp data, airgun and sparker seismic data and sediment (gravity) cores. Bathymetric data were used for identification and mapping of main geomorphic features on the seafloor. The distribution, geometry, reflection signature and seismic/acoustic stratigraphy of seabed sediments, were assessed based on chirp and seismic data. Sediment core analyses provided information about the depositional environment and age constraints for deglaciation. The primary focus was on two main study areas. The first area is Kveithola, a small submarine trough on the western margin of the continental shelf (NW of Bjørnøya). Results from Kveithola are presented in papers 1-2. In the first paper, the sedimentary environment in the trough from the time it was deglaciated before ~14.2 cal ka ago until the last sign of glacimarine sedimentation in the trough ~10.3 cal ka ago, is reconstructed. The second paper summarises both the complex retreat history of the Kveithola Ice Stream and the following glacimarine sedimentation in a conceptual model. The second study area was the central Barents Sea, which is addressed in papers 3-5. The third paper includes a map showing the distribution of large tunnel valleys on the seafloor, along with descriptions and discussions of their attributes, genesis and relevance for glacial history. The fourth paper focuses on the seafloor of upper Bjørnøyrenna, where a landform assemblage related to ice stream stagnation is presented and a new model of ice stream retreat in meltwater-dominated areas is introduced. In the final paper a new reconstruction of the deglaciation of the central Barents Sea is presented. The reconstruction includes main ice flow patterns, prolonged ice margin positions and glacial dynamics during the retreat of the ice sheet, based on both new and old data. |
format |
Doctoral or Postdoctoral Thesis |
author |
Bjarnadottir, Lilja Run |
author_facet |
Bjarnadottir, Lilja Run |
author_sort |
Bjarnadottir, Lilja Run |
title |
Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet |
title_short |
Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet |
title_full |
Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet |
title_fullStr |
Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet |
title_full_unstemmed |
Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet |
title_sort |
processes and dynamics during deglaciation of a polar continental shelf. examples from the marine-based barents sea ice sheet |
publisher |
Universitetet i Tromsø |
publishDate |
2012 |
url |
https://hdl.handle.net/10037/5146 |
long_lat |
ENVELOPE(-57.769,-57.769,-63.899,-63.899) ENVELOPE(-67.250,-67.250,-68.151,-68.151) ENVELOPE(-3.933,-3.933,-71.300,-71.300) ENVELOPE(25.017,25.017,67.850,67.850) ENVELOPE(-64.084,-64.084,-65.248,-65.248) |
geographic |
Andreassen Barents Sea Bjørnøya Boreas Junttila Rasmussen |
geographic_facet |
Andreassen Barents Sea Bjørnøya Boreas Junttila Rasmussen |
genre |
Barents Sea Bjørnøya Ice Sheet Sea ice |
genre_facet |
Barents Sea Bjørnøya Ice Sheet Sea ice |
op_relation |
978-82-8236-081-4 978-82-8236-080-7 https://hdl.handle.net/10037/5146 URN:NBN:no-uit_munin_4859 |
op_rights |
openAccess Copyright 2012 The Author(s) |
_version_ |
1766369179643936768 |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/5146 2023-05-15T15:38:20+02:00 Processes and dynamics during deglaciation of a polar continental shelf. Examples from the marine-based Barents Sea Ice Sheet Bjarnadottir, Lilja Run 2012-12-20 https://hdl.handle.net/10037/5146 eng eng Universitetet i Tromsø University of Tromsø 978-82-8236-081-4 978-82-8236-080-7 https://hdl.handle.net/10037/5146 URN:NBN:no-uit_munin_4859 openAccess Copyright 2012 The Author(s) VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 deglaciation Barents Sea marine geophysics ice stream grounding zone tunnel valley ATB stagnation meltwater geomorphology stratigraphy seismic chirp multibeam swath bathymetry Doctoral thesis Doktorgradsavhandling 2012 ftunivtroemsoe 2021-06-25T17:53:34Z The papers of this thesis are not available in Munin: 1. Rüther, D.C., Bjarnadóttir, L.R., Junttila, J., Husum, K., Rasmussen, T.L., Lucchi, R.G. and Andreassen, K.: 'Pattern and timing of the north-western Barents Sea Ice Sheet deglaciation and indications of episodic Holocene deposition', Boreas (2012), vol. 41(3):494-512. Available at http://dx.doi.org/10.1111/j.1502-3885.2011.00244.x 2. Bjarnadóttir, L.R., Rüther, D.C., Winsborrow, M.C.M. and Andreassen, K.: 'Grounding line dynamics of the Kveithola ice stream, W Barents Sea, as identified from seabed geomorphology and shallow seismic stratigraphy', Boreas (2013), vol. 42(1):84–107. Available at http://dx.doi.org/10.1111/j.1502-3885.2012.00273.x 3. Bjarnadóttir, L.R., Winsborrow, M.C.M. and Andreassen, K.: 'Tunnel valleys in the Barents Sea' (manuscript) 4. Andreassen, K., Winsborrow, M.C.M., Bjarnadóttir, L.R. and Rüther, D.C.: 'Landform assemblage from the collapse of the Bjørnøyrenna palaeo-ice stream, northern Barents Sea' (manuscript) 5. Bjarnadóttir, L.R., Winsborrow, M.C. and Andreassen, K.: 'Deglaciation of the central Barents Sea' (manuscript) The main objective of this PhD thesis was to reconstruct the pattern and main processes of the last deglaciation of the Barents Sea Ice Sheet. The thesis consists of an introductory part and five papers. The conclusions presented in the papers were based on data acquired with a suite of marine geophysical and geological methods, including multibeam-swath bathymetry data, chirp data, airgun and sparker seismic data and sediment (gravity) cores. Bathymetric data were used for identification and mapping of main geomorphic features on the seafloor. The distribution, geometry, reflection signature and seismic/acoustic stratigraphy of seabed sediments, were assessed based on chirp and seismic data. Sediment core analyses provided information about the depositional environment and age constraints for deglaciation. The primary focus was on two main study areas. The first area is Kveithola, a small submarine trough on the western margin of the continental shelf (NW of Bjørnøya). Results from Kveithola are presented in papers 1-2. In the first paper, the sedimentary environment in the trough from the time it was deglaciated before ~14.2 cal ka ago until the last sign of glacimarine sedimentation in the trough ~10.3 cal ka ago, is reconstructed. The second paper summarises both the complex retreat history of the Kveithola Ice Stream and the following glacimarine sedimentation in a conceptual model. The second study area was the central Barents Sea, which is addressed in papers 3-5. The third paper includes a map showing the distribution of large tunnel valleys on the seafloor, along with descriptions and discussions of their attributes, genesis and relevance for glacial history. The fourth paper focuses on the seafloor of upper Bjørnøyrenna, where a landform assemblage related to ice stream stagnation is presented and a new model of ice stream retreat in meltwater-dominated areas is introduced. In the final paper a new reconstruction of the deglaciation of the central Barents Sea is presented. The reconstruction includes main ice flow patterns, prolonged ice margin positions and glacial dynamics during the retreat of the ice sheet, based on both new and old data. Doctoral or Postdoctoral Thesis Barents Sea Bjørnøya Ice Sheet Sea ice University of Tromsø: Munin Open Research Archive Andreassen ENVELOPE(-57.769,-57.769,-63.899,-63.899) Barents Sea Bjørnøya ENVELOPE(-67.250,-67.250,-68.151,-68.151) Boreas ENVELOPE(-3.933,-3.933,-71.300,-71.300) Junttila ENVELOPE(25.017,25.017,67.850,67.850) Rasmussen ENVELOPE(-64.084,-64.084,-65.248,-65.248) |