Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing.
Measurements of ice temperature provide crucial constraints on ice viscosity and the thermodynamic processes occurring within a glacier. However, such measurements are presently limited by a small number of relatively coarse-spatial-resolution borehole records, especially for ice sheets. Here, we ad...
Main Authors: | , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Science advances
2021
|
Subjects: | |
Online Access: | https://doi.org/10.17863/CAM.71414 https://www.repository.cam.ac.uk/handle/1810/323952 |
id |
ftunivcam:oai:www.repository.cam.ac.uk:1810/323952 |
---|---|
record_format |
openpolar |
spelling |
ftunivcam:oai:www.repository.cam.ac.uk:1810/323952 2023-07-30T04:03:36+02:00 Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. Law, Robert Christoffersen, Poul Hubbard, Bryn Doyle, Samuel H Chudley, Thomas R Schoonman, Charlotte M Bougamont, Marion des Tombe, Bas Schilperoort, Bart Kechavarzi, Cedric Booth, Adam Young, Tun Jan 2021-06-17T11:00:55Z application/pdf https://doi.org/10.17863/CAM.71414 https://www.repository.cam.ac.uk/handle/1810/323952 eng eng Science advances doi:10.17863/CAM.71414 https://www.repository.cam.ac.uk/handle/1810/323952 Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ essn: 2375-2548 nlmid: 101653440 Article 2021 ftunivcam https://doi.org/10.17863/CAM.71414 2023-07-10T21:25:30Z Measurements of ice temperature provide crucial constraints on ice viscosity and the thermodynamic processes occurring within a glacier. However, such measurements are presently limited by a small number of relatively coarse-spatial-resolution borehole records, especially for ice sheets. Here, we advance our understanding of glacier thermodynamics with an exceptionally high-vertical-resolution (~0.65 m), distributed-fiber-optic temperature-sensing profile from a 1043-m borehole drilled to the base of Sermeq Kujalleq (Store Glacier), Greenland. We report substantial but isolated strain heating within interglacial-phase ice at 208 to 242 m depth together with strongly heterogeneous ice deformation in glacial-phase ice below 889 m. We also observe a high-strain interface between glacial- and interglacial-phase ice and a 73-m-thick temperate basal layer, interpreted as locally formed and important for the glacier's fast motion. These findings demonstrate notable spatial heterogeneity, both vertically and at the catchment scale, in the conditions facilitating the fast motion of marine-terminating glaciers in Greenland. Article in Journal/Newspaper glacier Greenland greenlandic Kujalleq Sermeq Kujalleq Apollo - University of Cambridge Repository Greenland Kujalleq ENVELOPE(-46.037,-46.037,60.719,60.719) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
description |
Measurements of ice temperature provide crucial constraints on ice viscosity and the thermodynamic processes occurring within a glacier. However, such measurements are presently limited by a small number of relatively coarse-spatial-resolution borehole records, especially for ice sheets. Here, we advance our understanding of glacier thermodynamics with an exceptionally high-vertical-resolution (~0.65 m), distributed-fiber-optic temperature-sensing profile from a 1043-m borehole drilled to the base of Sermeq Kujalleq (Store Glacier), Greenland. We report substantial but isolated strain heating within interglacial-phase ice at 208 to 242 m depth together with strongly heterogeneous ice deformation in glacial-phase ice below 889 m. We also observe a high-strain interface between glacial- and interglacial-phase ice and a 73-m-thick temperate basal layer, interpreted as locally formed and important for the glacier's fast motion. These findings demonstrate notable spatial heterogeneity, both vertically and at the catchment scale, in the conditions facilitating the fast motion of marine-terminating glaciers in Greenland. |
format |
Article in Journal/Newspaper |
author |
Law, Robert Christoffersen, Poul Hubbard, Bryn Doyle, Samuel H Chudley, Thomas R Schoonman, Charlotte M Bougamont, Marion des Tombe, Bas Schilperoort, Bart Kechavarzi, Cedric Booth, Adam Young, Tun Jan |
spellingShingle |
Law, Robert Christoffersen, Poul Hubbard, Bryn Doyle, Samuel H Chudley, Thomas R Schoonman, Charlotte M Bougamont, Marion des Tombe, Bas Schilperoort, Bart Kechavarzi, Cedric Booth, Adam Young, Tun Jan Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. |
author_facet |
Law, Robert Christoffersen, Poul Hubbard, Bryn Doyle, Samuel H Chudley, Thomas R Schoonman, Charlotte M Bougamont, Marion des Tombe, Bas Schilperoort, Bart Kechavarzi, Cedric Booth, Adam Young, Tun Jan |
author_sort |
Law, Robert |
title |
Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. |
title_short |
Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. |
title_full |
Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. |
title_fullStr |
Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. |
title_full_unstemmed |
Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. |
title_sort |
thermodynamics of a fast-moving greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing. |
publisher |
Science advances |
publishDate |
2021 |
url |
https://doi.org/10.17863/CAM.71414 https://www.repository.cam.ac.uk/handle/1810/323952 |
long_lat |
ENVELOPE(-46.037,-46.037,60.719,60.719) |
geographic |
Greenland Kujalleq |
geographic_facet |
Greenland Kujalleq |
genre |
glacier Greenland greenlandic Kujalleq Sermeq Kujalleq |
genre_facet |
glacier Greenland greenlandic Kujalleq Sermeq Kujalleq |
op_source |
essn: 2375-2548 nlmid: 101653440 |
op_relation |
doi:10.17863/CAM.71414 https://www.repository.cam.ac.uk/handle/1810/323952 |
op_rights |
Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.71414 |
_version_ |
1772814634876665856 |