Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores
International audience Fabric (distribution of crystallographic orienta-tions) along the full NEEM ice core, Greenland was measured in the field by an automatic ice texture analyzer every 10 m, from 33 m down to 2461 m depth. The fabric evolves from a slightly anisotropic fabric at the top, toward a...
Published in: | The Cryosphere |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
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Subjects: | |
Online Access: | https://hal.science/hal-01745573 https://hal.science/hal-01745573/document https://hal.science/hal-01745573/file/Montagnat2014_NEEMFabrics.pdf https://doi.org/10.5194/tc-8-1129-2014 |
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Open Polar |
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Université Savoie Mont Blanc: HAL |
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English |
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[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
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[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Montagnat, M. Azuma, N. Dahl-Jensen, D. Eichler, J. Fujita, S. Gillet-Chaulet, F. Kipfstuhl, S. Samyn, D. Svensson, A. Weikusat, I. Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Fabric (distribution of crystallographic orienta-tions) along the full NEEM ice core, Greenland was measured in the field by an automatic ice texture analyzer every 10 m, from 33 m down to 2461 m depth. The fabric evolves from a slightly anisotropic fabric at the top, toward a strong single maximum at about 2300 m, which is typical of a deformation pattern mostly driven by uniaxial compression and simple shearing. A sharp increase in the fabric strengthening rate is observed at the Holocene to Wisconsin (HW) climatic transition. From a simple model we estimate that this depth is located at a transition from a state dominated by vertical compression to a state dominated by vertical shear. Comparisons are made to two others ice cores drilled along the same ridge; the GRIP ice core, drilled at the summit of the ice sheet, and the NGRIP ice core, drilled 325 km to the NNW of the summit along the ridge, and 365 km upstream from NEEM. This comparison tends to demonstrate that the ice viscosity change with the HW climatic transition must be associated with the shear-dominated state to induce the abrupt fabric strengthening observed at NEEM. This comparison therefore reflects the increasing role of shear deformation on the coring site when moving NW along the ridge from GRIP to NGRIP and NEEM. The difference in fabric profiles between NEEM and NGRIP also evidences a stronger lateral extension associated with a sharper ridge at NGRIP. Further along the core, centimeter scale abrupt texture (fabric and microstructure) variations are observed in the bottom part of the core. Their positions are in good agreement with the observed folding layers in Dahl-Jensen et al. (2013). |
author2 |
EDGe Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Nagaoka University of Technology Niels Bohr Institute Copenhagen (NBI) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association National Institute of Polar Research Tokyo (NiPR) |
format |
Article in Journal/Newspaper |
author |
Montagnat, M. Azuma, N. Dahl-Jensen, D. Eichler, J. Fujita, S. Gillet-Chaulet, F. Kipfstuhl, S. Samyn, D. Svensson, A. Weikusat, I. |
author_facet |
Montagnat, M. Azuma, N. Dahl-Jensen, D. Eichler, J. Fujita, S. Gillet-Chaulet, F. Kipfstuhl, S. Samyn, D. Svensson, A. Weikusat, I. |
author_sort |
Montagnat, M. |
title |
Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores |
title_short |
Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores |
title_full |
Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores |
title_fullStr |
Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores |
title_full_unstemmed |
Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores |
title_sort |
fabric along the neem ice core, greenland, and its comparison with grip and ngrip ice cores |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-01745573 https://hal.science/hal-01745573/document https://hal.science/hal-01745573/file/Montagnat2014_NEEMFabrics.pdf https://doi.org/10.5194/tc-8-1129-2014 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland GRIP ice core Ice Sheet NGRIP The Cryosphere |
genre_facet |
Greenland GRIP ice core Ice Sheet NGRIP The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-01745573 The Cryosphere, 2014, 8 (4), pp.1129-1138. ⟨10.5194/tc-8-1129-2014⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-8-1129-2014 hal-01745573 https://hal.science/hal-01745573 https://hal.science/hal-01745573/document https://hal.science/hal-01745573/file/Montagnat2014_NEEMFabrics.pdf doi:10.5194/tc-8-1129-2014 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-8-1129-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1129 |
op_container_end_page |
1138 |
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1798846752194822144 |
spelling |
ftunivsavoie:oai:HAL:hal-01745573v1 2024-05-12T08:04:32+00:00 Fabric along the NEEM ice core, Greenland, and its comparison with GRIP and NGRIP ice cores Montagnat, M. Azuma, N. Dahl-Jensen, D. Eichler, J. Fujita, S. Gillet-Chaulet, F. Kipfstuhl, S. Samyn, D. Svensson, A. Weikusat, I. EDGe Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Nagaoka University of Technology Niels Bohr Institute Copenhagen (NBI) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association National Institute of Polar Research Tokyo (NiPR) 2014 https://hal.science/hal-01745573 https://hal.science/hal-01745573/document https://hal.science/hal-01745573/file/Montagnat2014_NEEMFabrics.pdf https://doi.org/10.5194/tc-8-1129-2014 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-8-1129-2014 hal-01745573 https://hal.science/hal-01745573 https://hal.science/hal-01745573/document https://hal.science/hal-01745573/file/Montagnat2014_NEEMFabrics.pdf doi:10.5194/tc-8-1129-2014 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-01745573 The Cryosphere, 2014, 8 (4), pp.1129-1138. ⟨10.5194/tc-8-1129-2014⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2014 ftunivsavoie https://doi.org/10.5194/tc-8-1129-2014 2024-04-18T00:32:32Z International audience Fabric (distribution of crystallographic orienta-tions) along the full NEEM ice core, Greenland was measured in the field by an automatic ice texture analyzer every 10 m, from 33 m down to 2461 m depth. The fabric evolves from a slightly anisotropic fabric at the top, toward a strong single maximum at about 2300 m, which is typical of a deformation pattern mostly driven by uniaxial compression and simple shearing. A sharp increase in the fabric strengthening rate is observed at the Holocene to Wisconsin (HW) climatic transition. From a simple model we estimate that this depth is located at a transition from a state dominated by vertical compression to a state dominated by vertical shear. Comparisons are made to two others ice cores drilled along the same ridge; the GRIP ice core, drilled at the summit of the ice sheet, and the NGRIP ice core, drilled 325 km to the NNW of the summit along the ridge, and 365 km upstream from NEEM. This comparison tends to demonstrate that the ice viscosity change with the HW climatic transition must be associated with the shear-dominated state to induce the abrupt fabric strengthening observed at NEEM. This comparison therefore reflects the increasing role of shear deformation on the coring site when moving NW along the ridge from GRIP to NGRIP and NEEM. The difference in fabric profiles between NEEM and NGRIP also evidences a stronger lateral extension associated with a sharper ridge at NGRIP. Further along the core, centimeter scale abrupt texture (fabric and microstructure) variations are observed in the bottom part of the core. Their positions are in good agreement with the observed folding layers in Dahl-Jensen et al. (2013). Article in Journal/Newspaper Greenland GRIP ice core Ice Sheet NGRIP The Cryosphere Université Savoie Mont Blanc: HAL Greenland The Cryosphere 8 4 1129 1138 |