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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ftinsu:oai:HAL:hal-00298184v1 2024-02-11T09:58:11+01:00 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 = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association Scientific Research Centre Russian Academy of Sciences Moscow (RAS) Laboratoire de Glaciologie Polaire Département des Sciences de la Terre et de l'Environnement (DSTE) 2007-05-07 https://hal.science/hal-00298184 https://hal.science/hal-00298184/document https://hal.science/hal-00298184/file/cpd-3-693-2007.pdf en eng HAL CCSD European Geosciences Union (EGU) hal-00298184 https://hal.science/hal-00298184 https://hal.science/hal-00298184/document https://hal.science/hal-00298184/file/cpd-3-693-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298184 Climate of the Past Discussions, 2007, 3 (3), pp.693-727 [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 ftinsu 2024-01-17T17:27:29Z 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 Institut national des sciences de l'Univers: HAL-INSU Antarctic Dronning Maud Land The Antarctic |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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 = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association 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.science/hal-00298184 https://hal.science/hal-00298184/document https://hal.science/hal-00298184/file/cpd-3-693-2007.pdf |
geographic |
Antarctic Dronning Maud Land The Antarctic |
geographic_facet |
Antarctic Dronning Maud Land The Antarctic |
genre |
Antarc* Antarctic Dronning Maud Land ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Dronning Maud Land ice core Ice Sheet |
op_source |
ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298184 Climate of the Past Discussions, 2007, 3 (3), pp.693-727 |
op_relation |
hal-00298184 https://hal.science/hal-00298184 https://hal.science/hal-00298184/document https://hal.science/hal-00298184/file/cpd-3-693-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790593788595404800 |