Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland
Petermann Fjord is a deep ( > 1000 m) fjord that incises the coastline of north-west Greenland and was carved by an expanded Petermann Glacier, one of the six largest outlet glaciers draining the modern Greenland Ice Sheet (GrIS). Between 5 and 70m of unconsolidated glacigenic material infills in...
Published in: | The Cryosphere |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/01dd78e5-12e0-44ee-9c43-835f354fee62 2023-06-11T04:06:38+02:00 Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland Hogan, Kelly A. Jakobsson, Martin Mayer, Larry Reilly, Brendan T. Jennings, Anne E. Stoner, Joseph S. Nielsen, Tove Andresen, Katrine J. Nørmark, Egon Heirman, Katrien A. Kamla, Elina Jerram, Kevin Stranne, Christian Mix, Alan 2020 https://pure.au.dk/portal/da/publications/glacial-sedimentation-fluxes-and-erosion-rates-associated-with-ice-retreat-in-petermann-fjord-and-nares-strait-northwest-greenland(01dd78e5-12e0-44ee-9c43-835f354fee62).html https://doi.org/10.5194/tc-14-261-2020 http://www.scopus.com/inward/record.url?scp=85078798751&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Hogan , K A , Jakobsson , M , Mayer , L , Reilly , B T , Jennings , A E , Stoner , J S , Nielsen , T , Andresen , K J , Nørmark , E , Heirman , K A , Kamla , E , Jerram , K , Stranne , C & Mix , A 2020 , ' Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland ' , Cryosphere , vol. 14 , no. 1 , pp. 261-286 . https://doi.org/10.5194/tc-14-261-2020 article 2020 ftuniaarhuspubl https://doi.org/10.5194/tc-14-261-2020 2023-04-19T22:57:06Z Petermann Fjord is a deep ( > 1000 m) fjord that incises the coastline of north-west Greenland and was carved by an expanded Petermann Glacier, one of the six largest outlet glaciers draining the modern Greenland Ice Sheet (GrIS). Between 5 and 70m of unconsolidated glacigenic material infills in the fjord and adjacent Nares Strait, deposited as the Petermann and Nares Strait ice streams retreated through the area after the Last Glacial Maximum. We have investigated the deglacial deposits using seismic stratigraphic techniques and have correlated our results with high-resolution bathymetric data and core lithofacies. We identify six seismoacoustic facies in more than 3500 line kilometres of subbottom and seismic-reflection profiles throughout the fjord, Hall Basin and Kennedy Channel. Seismo-acoustic facies relate to bedrock or till surfaces (Facies I), subglacial deposition (Facies II), deposition from meltwater plumes and icebergs in quiescent glacimarine conditions (Facies III, IV), deposition at grounded ice margins during stillstands in retreat (grounding-zone wedges; Facies V) and the redeposition of material downslope (Facies IV). These sediment units represent the total volume of glacial sediment delivered to the mapped marine environment during retreat. We calculate a glacial sediment flux for the former Petermann ice stream as 1080-1420m3 a -1 per metre of ice stream width and an average deglacial erosion rate for the basin of 0.29-0.34mma -1 . Our deglacial erosion rates are consistent with results from Antarctic Peninsula fjord systems but are several times lower than values for other modern GrIS catchments. This difference is attributed to fact that large volumes of surface water do not access the bed in the Petermann system, and we conclude that glacial erosion is limited to areas overridden by streaming ice in this large outlet glacier setting. Erosion rates are also presented for two phases of ice retreat and confirm that there is significant variation in rates over a glacial- deglacial ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula glacier Greenland Hall Basin Ice Sheet Iceberg* Kennedy channel Nares strait Petermann Fjord Petermann glacier Aarhus University: Research Antarctic Antarctic Peninsula Greenland Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Kennedy Channel ENVELOPE(-66.139,-66.139,80.919,80.919) Petermann Fjord ENVELOPE(-61.500,-61.500,81.167,81.167) Hall Basin ENVELOPE(-62.992,-62.992,81.502,81.502) The Cryosphere 14 1 261 286 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
Petermann Fjord is a deep ( > 1000 m) fjord that incises the coastline of north-west Greenland and was carved by an expanded Petermann Glacier, one of the six largest outlet glaciers draining the modern Greenland Ice Sheet (GrIS). Between 5 and 70m of unconsolidated glacigenic material infills in the fjord and adjacent Nares Strait, deposited as the Petermann and Nares Strait ice streams retreated through the area after the Last Glacial Maximum. We have investigated the deglacial deposits using seismic stratigraphic techniques and have correlated our results with high-resolution bathymetric data and core lithofacies. We identify six seismoacoustic facies in more than 3500 line kilometres of subbottom and seismic-reflection profiles throughout the fjord, Hall Basin and Kennedy Channel. Seismo-acoustic facies relate to bedrock or till surfaces (Facies I), subglacial deposition (Facies II), deposition from meltwater plumes and icebergs in quiescent glacimarine conditions (Facies III, IV), deposition at grounded ice margins during stillstands in retreat (grounding-zone wedges; Facies V) and the redeposition of material downslope (Facies IV). These sediment units represent the total volume of glacial sediment delivered to the mapped marine environment during retreat. We calculate a glacial sediment flux for the former Petermann ice stream as 1080-1420m3 a -1 per metre of ice stream width and an average deglacial erosion rate for the basin of 0.29-0.34mma -1 . Our deglacial erosion rates are consistent with results from Antarctic Peninsula fjord systems but are several times lower than values for other modern GrIS catchments. This difference is attributed to fact that large volumes of surface water do not access the bed in the Petermann system, and we conclude that glacial erosion is limited to areas overridden by streaming ice in this large outlet glacier setting. Erosion rates are also presented for two phases of ice retreat and confirm that there is significant variation in rates over a glacial- deglacial ... |
format |
Article in Journal/Newspaper |
author |
Hogan, Kelly A. Jakobsson, Martin Mayer, Larry Reilly, Brendan T. Jennings, Anne E. Stoner, Joseph S. Nielsen, Tove Andresen, Katrine J. Nørmark, Egon Heirman, Katrien A. Kamla, Elina Jerram, Kevin Stranne, Christian Mix, Alan |
spellingShingle |
Hogan, Kelly A. Jakobsson, Martin Mayer, Larry Reilly, Brendan T. Jennings, Anne E. Stoner, Joseph S. Nielsen, Tove Andresen, Katrine J. Nørmark, Egon Heirman, Katrien A. Kamla, Elina Jerram, Kevin Stranne, Christian Mix, Alan Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland |
author_facet |
Hogan, Kelly A. Jakobsson, Martin Mayer, Larry Reilly, Brendan T. Jennings, Anne E. Stoner, Joseph S. Nielsen, Tove Andresen, Katrine J. Nørmark, Egon Heirman, Katrien A. Kamla, Elina Jerram, Kevin Stranne, Christian Mix, Alan |
author_sort |
Hogan, Kelly A. |
title |
Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland |
title_short |
Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland |
title_full |
Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland |
title_fullStr |
Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland |
title_full_unstemmed |
Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland |
title_sort |
glacial sedimentation, fluxes and erosion rates associated with ice retreat in petermann fjord and nares strait, north-west greenland |
publishDate |
2020 |
url |
https://pure.au.dk/portal/da/publications/glacial-sedimentation-fluxes-and-erosion-rates-associated-with-ice-retreat-in-petermann-fjord-and-nares-strait-northwest-greenland(01dd78e5-12e0-44ee-9c43-835f354fee62).html https://doi.org/10.5194/tc-14-261-2020 http://www.scopus.com/inward/record.url?scp=85078798751&partnerID=8YFLogxK |
long_lat |
ENVELOPE(158.167,158.167,-81.450,-81.450) ENVELOPE(-66.139,-66.139,80.919,80.919) ENVELOPE(-61.500,-61.500,81.167,81.167) ENVELOPE(-62.992,-62.992,81.502,81.502) |
geographic |
Antarctic Antarctic Peninsula Greenland Nares Kennedy Channel Petermann Fjord Hall Basin |
geographic_facet |
Antarctic Antarctic Peninsula Greenland Nares Kennedy Channel Petermann Fjord Hall Basin |
genre |
Antarc* Antarctic Antarctic Peninsula glacier Greenland Hall Basin Ice Sheet Iceberg* Kennedy channel Nares strait Petermann Fjord Petermann glacier |
genre_facet |
Antarc* Antarctic Antarctic Peninsula glacier Greenland Hall Basin Ice Sheet Iceberg* Kennedy channel Nares strait Petermann Fjord Petermann glacier |
op_source |
Hogan , K A , Jakobsson , M , Mayer , L , Reilly , B T , Jennings , A E , Stoner , J S , Nielsen , T , Andresen , K J , Nørmark , E , Heirman , K A , Kamla , E , Jerram , K , Stranne , C & Mix , A 2020 , ' Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland ' , Cryosphere , vol. 14 , no. 1 , pp. 261-286 . https://doi.org/10.5194/tc-14-261-2020 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-14-261-2020 |
container_title |
The Cryosphere |
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14 |
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261 |
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