Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model
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 Antarc...
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.693828 https://doi.org/10.1594/PANGAEA.693828 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.693828 2023-05-15T13:42:09+02:00 Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model Huybrechts, Philippe Rybak, Oleg Pattyn, Frank Ruth, Urs Steinhage, Daniel MEDIAN LATITUDE: -75.138621 * MEDIAN LONGITUDE: 2.829546 * SOUTH-BOUND LATITUDE: -75.282059 * WEST-BOUND LONGITUDE: 0.070343 * NORTH-BOUND LATITUDE: -75.002892 * EAST-BOUND LONGITUDE: 6.470206 2007-05-20 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.693828 https://doi.org/10.1594/PANGAEA.693828 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.693828 https://doi.org/10.1594/PANGAEA.693828 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Huybrechts, Philippe; Rybak, Oleg; Pattyn, Frank; Ruth, Urs; Steinhage, Daniel (2007): 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. Climate of the Past, 3(4), 577-589, https://doi.org/10.5194/cp-3-577-2007 AWI_Glac AWI_stations AWI Antarctic Land Expedition Dronning Maud Land Antarctica Glaciology @ AWI Kohnen Research station RS Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.693828 https://doi.org/10.5194/cp-3-577-2007 2023-01-20T07:31:11Z 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. Dataset Antarc* Antarctic Antarctica Dronning Maud Land ice core Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Dronning Maud Land Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Kohnen Station ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.070343,6.470206,-75.002892,-75.282059) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Glac AWI_stations AWI Antarctic Land Expedition Dronning Maud Land Antarctica Glaciology @ AWI Kohnen Research station RS |
spellingShingle |
AWI_Glac AWI_stations AWI Antarctic Land Expedition Dronning Maud Land Antarctica Glaciology @ AWI Kohnen Research station RS Huybrechts, Philippe Rybak, Oleg Pattyn, Frank Ruth, Urs Steinhage, Daniel Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model |
topic_facet |
AWI_Glac AWI_stations AWI Antarctic Land Expedition Dronning Maud Land Antarctica Glaciology @ AWI Kohnen Research station RS |
description |
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. |
format |
Dataset |
author |
Huybrechts, Philippe Rybak, Oleg Pattyn, Frank Ruth, Urs Steinhage, Daniel |
author_facet |
Huybrechts, Philippe Rybak, Oleg Pattyn, Frank Ruth, Urs Steinhage, Daniel |
author_sort |
Huybrechts, Philippe |
title |
Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model |
title_short |
Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model |
title_full |
Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model |
title_fullStr |
Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model |
title_full_unstemmed |
Lagrangian back-tracing results for Kohnen station; output of time dependent numerical experiment with a 3D nested Antarctic ice sheet model |
title_sort |
lagrangian back-tracing results for kohnen station; output of time dependent numerical experiment with a 3d nested antarctic ice sheet model |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.693828 https://doi.org/10.1594/PANGAEA.693828 |
op_coverage |
MEDIAN LATITUDE: -75.138621 * MEDIAN LONGITUDE: 2.829546 * SOUTH-BOUND LATITUDE: -75.282059 * WEST-BOUND LONGITUDE: 0.070343 * NORTH-BOUND LATITUDE: -75.002892 * EAST-BOUND LONGITUDE: 6.470206 |
long_lat |
ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.070343,6.470206,-75.002892,-75.282059) |
geographic |
Antarctic Dronning Maud Land Kohnen Kohnen Station |
geographic_facet |
Antarctic Dronning Maud Land Kohnen Kohnen Station |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land ice core Ice Sheet |
op_source |
Supplement to: Huybrechts, Philippe; Rybak, Oleg; Pattyn, Frank; Ruth, Urs; Steinhage, Daniel (2007): 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. Climate of the Past, 3(4), 577-589, https://doi.org/10.5194/cp-3-577-2007 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.693828 https://doi.org/10.1594/PANGAEA.693828 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.693828 https://doi.org/10.5194/cp-3-577-2007 |
_version_ |
1766163333329715200 |