Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history
International audience The climate history and dynamics of the Greenland Ice Sheet are studied using a coupled model of the depositional provenance and transport of glacier ice, allowing simultaneous prediction of the detailed isotopic stratigraphy of ice cores at all the major Greenland sites. Adop...
Published in: | Quaternary Science Reviews |
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Main Authors: | , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2005
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Online Access: | https://insu.hal.science/insu-00374862 https://doi.org/10.1016/j.quascirev.2004.08.020 |
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ftunivsavoie:oai:HAL:insu-00374862v1 |
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Open Polar |
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Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Lhomme, Nicolas Clarke, Garry K. C. Marshall, Shawn J. Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience The climate history and dynamics of the Greenland Ice Sheet are studied using a coupled model of the depositional provenance and transport of glacier ice, allowing simultaneous prediction of the detailed isotopic stratigraphy of ice cores at all the major Greenland sites. Adopting a novel method for reconstructing the age–depth relationship, we greatly improve the accuracy of semi-Lagrangian tracer tracking schemes and can readily incorporate an age-dependent ice rheology. The larger aim of our study is to impose new constraints on the glacial history of the Greenland Ice Sheet. Leading sources of uncertainty in the climate and dynamic history are encapsulated in a small number of parameters: the temperature and elevation isotopic sensitivities, the glacial–interglacial precipitation contrast and the effective viscosity of ice in the flow law. Comparing predicted and observed ice layering at ice core sites, we establish plausible ranges for the key model parameters, identify climate and dynamic histories that are mutually consistent and recover the past depositional elevation of ice cores to ease interpretation of their climatic records. With the coupled three-dimensional model of ice dynamics and provenance transport we propose a method to place all the ice core records on a common time scale and use discrepancies to adjust the reconstructed climate history. Analysis of simulated GRIP ice layering and borehole temperature profiles confirms that the GRIP record is sensitive to the dynamic as well as to the climatic history, but not enough to strongly limit speculation on the state of the Greenland Ice Sheet during the Eemian. In contrast, our study indicates that the Dye 3 and Camp Century ice cores are extremely sensitive to ice dynamics and greatly constrain Eemian ice sheet reconstructions. We suggest that the maximum Eemian sea-level contribution of the ice sheet was in the range of 3.5–4.5 m. |
author2 |
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) Earth and Ocean Sciences (EOS) University of British Columbia (UBC) Department of Geography Calgary University of Calgary |
format |
Article in Journal/Newspaper |
author |
Lhomme, Nicolas Clarke, Garry K. C. Marshall, Shawn J. |
author_facet |
Lhomme, Nicolas Clarke, Garry K. C. Marshall, Shawn J. |
author_sort |
Lhomme, Nicolas |
title |
Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history |
title_short |
Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history |
title_full |
Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history |
title_fullStr |
Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history |
title_full_unstemmed |
Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history |
title_sort |
tracer transport in the greenland ice sheet: constraints on ice cores and glacial history |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://insu.hal.science/insu-00374862 https://doi.org/10.1016/j.quascirev.2004.08.020 |
genre |
Dye 3 Dye-3 glacier Greenland GRIP ice core Ice Sheet |
genre_facet |
Dye 3 Dye-3 glacier Greenland GRIP ice core Ice Sheet |
op_source |
ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://insu.hal.science/insu-00374862 Quaternary Science Reviews, 2005, 24 (1-2), pp.173 à 194. ⟨10.1016/j.quascirev.2004.08.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2004.08.020 insu-00374862 https://insu.hal.science/insu-00374862 doi:10.1016/j.quascirev.2004.08.020 |
op_doi |
https://doi.org/10.1016/j.quascirev.2004.08.020 |
container_title |
Quaternary Science Reviews |
container_volume |
24 |
container_issue |
1-2 |
container_start_page |
173 |
op_container_end_page |
194 |
_version_ |
1797581971237371904 |
spelling |
ftunivsavoie:oai:HAL:insu-00374862v1 2024-04-28T08:17:17+00:00 Tracer transport in the Greenland Ice Sheet: constraints on ice cores and glacial history Lhomme, Nicolas Clarke, Garry K. C. Marshall, Shawn J. 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) Earth and Ocean Sciences (EOS) University of British Columbia (UBC) Department of Geography Calgary University of Calgary 2005 https://insu.hal.science/insu-00374862 https://doi.org/10.1016/j.quascirev.2004.08.020 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2004.08.020 insu-00374862 https://insu.hal.science/insu-00374862 doi:10.1016/j.quascirev.2004.08.020 ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://insu.hal.science/insu-00374862 Quaternary Science Reviews, 2005, 24 (1-2), pp.173 à 194. ⟨10.1016/j.quascirev.2004.08.020⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2005 ftunivsavoie https://doi.org/10.1016/j.quascirev.2004.08.020 2024-04-11T00:33:51Z International audience The climate history and dynamics of the Greenland Ice Sheet are studied using a coupled model of the depositional provenance and transport of glacier ice, allowing simultaneous prediction of the detailed isotopic stratigraphy of ice cores at all the major Greenland sites. Adopting a novel method for reconstructing the age–depth relationship, we greatly improve the accuracy of semi-Lagrangian tracer tracking schemes and can readily incorporate an age-dependent ice rheology. The larger aim of our study is to impose new constraints on the glacial history of the Greenland Ice Sheet. Leading sources of uncertainty in the climate and dynamic history are encapsulated in a small number of parameters: the temperature and elevation isotopic sensitivities, the glacial–interglacial precipitation contrast and the effective viscosity of ice in the flow law. Comparing predicted and observed ice layering at ice core sites, we establish plausible ranges for the key model parameters, identify climate and dynamic histories that are mutually consistent and recover the past depositional elevation of ice cores to ease interpretation of their climatic records. With the coupled three-dimensional model of ice dynamics and provenance transport we propose a method to place all the ice core records on a common time scale and use discrepancies to adjust the reconstructed climate history. Analysis of simulated GRIP ice layering and borehole temperature profiles confirms that the GRIP record is sensitive to the dynamic as well as to the climatic history, but not enough to strongly limit speculation on the state of the Greenland Ice Sheet during the Eemian. In contrast, our study indicates that the Dye 3 and Camp Century ice cores are extremely sensitive to ice dynamics and greatly constrain Eemian ice sheet reconstructions. We suggest that the maximum Eemian sea-level contribution of the ice sheet was in the range of 3.5–4.5 m. Article in Journal/Newspaper Dye 3 Dye-3 glacier Greenland GRIP ice core Ice Sheet Université Savoie Mont Blanc: HAL Quaternary Science Reviews 24 1-2 173 194 |