Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet

International audience A nested ice flow model was developed for eastern Dronning Maud Land to assist with the dating and interpretation of the EDML deep ice core. The model consists of a high-resolution higher-order ice dynamic flow model that was nested into a comprehensive 3-D thermomechanical mo...

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Main Authors: Huybrechts, P., Rybak, O., Pattyn, F., Ruth, U., Steinhage, D.
Other Authors: Departement Geografie, Vrije Universiteit Brussel (VUB), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Scientific Research Centre, Russian Academy of Sciences Moscow (RAS), Laboratoire de Glaciologie Polaire, Département des Sciences de la Terre et de l'Environnement (DSTE)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2007
Subjects:
Online Access:https://hal.archives-ouvertes.fr/hal-00298090
https://hal.archives-ouvertes.fr/hal-00298090/document
https://hal.archives-ouvertes.fr/hal-00298090/file/cp-3-577-2007.pdf
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spelling ftccsdartic:oai:HAL:hal-00298090v1 2023-05-15T13:51:27+02:00 Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet Huybrechts, P. Rybak, O. Pattyn, F. Ruth, U. Steinhage, D. Departement Geografie Vrije Universiteit Brussel (VUB) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI) Scientific Research Centre Russian Academy of Sciences Moscow (RAS) Laboratoire de Glaciologie Polaire Département des Sciences de la Terre et de l'Environnement (DSTE) 2007-10-02 https://hal.archives-ouvertes.fr/hal-00298090 https://hal.archives-ouvertes.fr/hal-00298090/document https://hal.archives-ouvertes.fr/hal-00298090/file/cp-3-577-2007.pdf en eng HAL CCSD European Geosciences Union (EGU) hal-00298090 https://hal.archives-ouvertes.fr/hal-00298090 https://hal.archives-ouvertes.fr/hal-00298090/document https://hal.archives-ouvertes.fr/hal-00298090/file/cp-3-577-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.archives-ouvertes.fr/hal-00298090 Climate of the Past, European Geosciences Union (EGU), 2007, 3 (4), pp.577-589 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2021-10-24T20:58:41Z International audience A nested ice flow model was developed for eastern Dronning Maud Land to assist with the dating and interpretation of the EDML deep ice core. The model consists of a high-resolution higher-order ice dynamic flow model that was nested into a comprehensive 3-D thermomechanical model of the whole Antarctic ice sheet. As the drill site is on a flank position the calculations specifically take into account the effects of horizontal advection as deeper ice in the core originated from higher inland. First the regional velocity field and ice sheet geometry is obtained from a forward experiment over the last 8 glacial cycles. The result is subsequently employed in a Lagrangian backtracing algorithm to provide particle paths back to their time and place of deposition. The procedure directly yields the depth-age distribution, surface conditions at particle origin, and a suite of relevant parameters such as initial annual layer thickness. This paper discusses the method and the main results of the experiment, including the ice core chronology, the non-climatic corrections needed to extract the climatic part of the signal, and the thinning function. The focus is on the upper 89% of the ice core (appr. 170 kyears) as the dating below that is increasingly less robust owing to the unknown value of the geothermal heat flux. It is found that the temperature biases resulting from variations of surface elevation are up to half of the magnitude of the climatic changes themselves. Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land ice core Ice Sheet Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Dronning Maud Land
institution Open Polar
collection Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
op_collection_id ftccsdartic
language English
topic [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
spellingShingle [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Huybrechts, P.
Rybak, O.
Pattyn, F.
Ruth, U.
Steinhage, D.
Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet
topic_facet [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
description International audience A nested ice flow model was developed for eastern Dronning Maud Land to assist with the dating and interpretation of the EDML deep ice core. The model consists of a high-resolution higher-order ice dynamic flow model that was nested into a comprehensive 3-D thermomechanical model of the whole Antarctic ice sheet. As the drill site is on a flank position the calculations specifically take into account the effects of horizontal advection as deeper ice in the core originated from higher inland. First the regional velocity field and ice sheet geometry is obtained from a forward experiment over the last 8 glacial cycles. The result is subsequently employed in a Lagrangian backtracing algorithm to provide particle paths back to their time and place of deposition. The procedure directly yields the depth-age distribution, surface conditions at particle origin, and a suite of relevant parameters such as initial annual layer thickness. This paper discusses the method and the main results of the experiment, including the ice core chronology, the non-climatic corrections needed to extract the climatic part of the signal, and the thinning function. The focus is on the upper 89% of the ice core (appr. 170 kyears) as the dating below that is increasingly less robust owing to the unknown value of the geothermal heat flux. It is found that the temperature biases resulting from variations of surface elevation are up to half of the magnitude of the climatic changes themselves.
author2 Departement Geografie
Vrije Universiteit Brussel (VUB)
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI)
Scientific Research Centre
Russian Academy of Sciences Moscow (RAS)
Laboratoire de Glaciologie Polaire
Département des Sciences de la Terre et de l'Environnement (DSTE)
format Article in Journal/Newspaper
author Huybrechts, P.
Rybak, O.
Pattyn, F.
Ruth, U.
Steinhage, D.
author_facet Huybrechts, P.
Rybak, O.
Pattyn, F.
Ruth, U.
Steinhage, D.
author_sort Huybrechts, P.
title Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet
title_short Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet
title_full Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet
title_fullStr Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet
title_full_unstemmed Ice thinning, upstream advection, and non-climatic biases for the upper 89% of the EDML ice core from a nested model of the Antarctic ice sheet
title_sort ice thinning, upstream advection, and non-climatic biases for the upper 89% of the edml ice core from a nested model of the antarctic ice sheet
publisher HAL CCSD
publishDate 2007
url https://hal.archives-ouvertes.fr/hal-00298090
https://hal.archives-ouvertes.fr/hal-00298090/document
https://hal.archives-ouvertes.fr/hal-00298090/file/cp-3-577-2007.pdf
geographic Antarctic
The Antarctic
Dronning Maud Land
geographic_facet Antarctic
The Antarctic
Dronning Maud Land
genre Antarc*
Antarctic
Dronning Maud Land
ice core
Ice Sheet
genre_facet Antarc*
Antarctic
Dronning Maud Land
ice core
Ice Sheet
op_source ISSN: 1814-9324
EISSN: 1814-9332
Climate of the Past
https://hal.archives-ouvertes.fr/hal-00298090
Climate of the Past, European Geosciences Union (EGU), 2007, 3 (4), pp.577-589
op_relation hal-00298090
https://hal.archives-ouvertes.fr/hal-00298090
https://hal.archives-ouvertes.fr/hal-00298090/document
https://hal.archives-ouvertes.fr/hal-00298090/file/cp-3-577-2007.pdf
op_rights info:eu-repo/semantics/OpenAccess
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