MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION
One of the main sources of our knowledge about past air temperature variations is the isotopic composition of the ice cores obtained during deep drilling of the ice sheets. During 2001–2006 deep drilling was carried out at Kohnen station in Dronning Maud Land, Antarcticawithin the frameworks of the...
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ftdoajarticles:oai:doaj.org/article:c9c36d91f817488caf7b3dab36146a0b 2023-05-15T13:58:57+02:00 MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION O. O. Rybak P. Huybrechts 2015-11-01T00:00:00Z https://doi.org/10.15356/2076-6734-2012-4-5-16 https://doaj.org/article/c9c36d91f817488caf7b3dab36146a0b RU rus Nauka https://ice-snow.igras.ru/jour/article/view/219 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2012-4-5-16 https://doaj.org/article/c9c36d91f817488caf7b3dab36146a0b Лëд и снег, Vol 52, Iss 3, Pp 5-16 (2015) вариации климата возраст льда изотопный состав льда ледниковый щит математическая модель поток геотермического тепла течение льда Science Q article 2015 ftdoajarticles https://doi.org/10.15356/2076-6734-2012-4-5-16 2023-03-19T01:40:13Z One of the main sources of our knowledge about past air temperature variations is the isotopic composition of the ice cores obtained during deep drilling of the ice sheets. During 2001–2006 deep drilling was carried out at Kohnen station in Dronning Maud Land, Antarcticawithin the frameworks of the European Project for Ice Coring in Antarctica (EPICA). As a result, an ice core of 2774 mlength was obtained. Variations of air temperature are linearly dependent on isotopic composition of an ice core, but the reconstructed temperature series contains besides the climatic signal, a topographic bias. Appearance of this bias is explained by the upstream advection from the elevated sites where the ice particles were originally deposited, and by the local vertical movements of the surface of the ice sheet through time. In order to calculate this non-climatic (topographic) bias in the isotopic and reconstructed air temperature record, we applied a methodology based on mathematical ice-flow modeling. In the lower part of the ice sheet ice chronology and non-climatic biases are strongly affected by unknown value of the geothermal heat flux (G). Melt water, which was found close to the bedrock suggests that that assumed G = 54.6 mWm-2 (the average value for Antarctica) was very likely underestimated in the surroundings of Kohnen. In order to estimate the range of possible values of ice age and of non-climatic bias in the lower part of the core we carried out a series of numerical experiment with G increased by 5–30%. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land EPICA ice core Ice Sheet Queen Maud Land Directory of Open Access Journals: DOAJ Articles Dronning Maud Land Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Kohnen Station ENVELOPE(0.000,0.000,-75.000,-75.000) Queen Maud Land ENVELOPE(12.000,12.000,-72.500,-72.500) Ice and Snow 52 3 5 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
вариации климата возраст льда изотопный состав льда ледниковый щит математическая модель поток геотермического тепла течение льда Science Q |
spellingShingle |
вариации климата возраст льда изотопный состав льда ледниковый щит математическая модель поток геотермического тепла течение льда Science Q O. O. Rybak P. Huybrechts MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION |
topic_facet |
вариации климата возраст льда изотопный состав льда ледниковый щит математическая модель поток геотермического тепла течение льда Science Q |
description |
One of the main sources of our knowledge about past air temperature variations is the isotopic composition of the ice cores obtained during deep drilling of the ice sheets. During 2001–2006 deep drilling was carried out at Kohnen station in Dronning Maud Land, Antarcticawithin the frameworks of the European Project for Ice Coring in Antarctica (EPICA). As a result, an ice core of 2774 mlength was obtained. Variations of air temperature are linearly dependent on isotopic composition of an ice core, but the reconstructed temperature series contains besides the climatic signal, a topographic bias. Appearance of this bias is explained by the upstream advection from the elevated sites where the ice particles were originally deposited, and by the local vertical movements of the surface of the ice sheet through time. In order to calculate this non-climatic (topographic) bias in the isotopic and reconstructed air temperature record, we applied a methodology based on mathematical ice-flow modeling. In the lower part of the ice sheet ice chronology and non-climatic biases are strongly affected by unknown value of the geothermal heat flux (G). Melt water, which was found close to the bedrock suggests that that assumed G = 54.6 mWm-2 (the average value for Antarctica) was very likely underestimated in the surroundings of Kohnen. In order to estimate the range of possible values of ice age and of non-climatic bias in the lower part of the core we carried out a series of numerical experiment with G increased by 5–30%. |
format |
Article in Journal/Newspaper |
author |
O. O. Rybak P. Huybrechts |
author_facet |
O. O. Rybak P. Huybrechts |
author_sort |
O. O. Rybak |
title |
MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION |
title_short |
MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION |
title_full |
MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION |
title_fullStr |
MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION |
title_full_unstemmed |
MATHEMATICAL MODELING OF ICE FLOW IN QUEEN MAUD LAND, ANTARCTICA, AND ITS APPLICATION TO THE LATE QUATERNARY CLIMATIC PALEORECONSTRUCTION |
title_sort |
mathematical modeling of ice flow in queen maud land, antarctica, and its application to the late quaternary climatic paleoreconstruction |
publisher |
Nauka |
publishDate |
2015 |
url |
https://doi.org/10.15356/2076-6734-2012-4-5-16 https://doaj.org/article/c9c36d91f817488caf7b3dab36146a0b |
long_lat |
ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(12.000,12.000,-72.500,-72.500) |
geographic |
Dronning Maud Land Kohnen Kohnen Station Queen Maud Land |
geographic_facet |
Dronning Maud Land Kohnen Kohnen Station Queen Maud Land |
genre |
Antarc* Antarctica Dronning Maud Land EPICA ice core Ice Sheet Queen Maud Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land EPICA ice core Ice Sheet Queen Maud Land |
op_source |
Лëд и снег, Vol 52, Iss 3, Pp 5-16 (2015) |
op_relation |
https://ice-snow.igras.ru/jour/article/view/219 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2012-4-5-16 https://doaj.org/article/c9c36d91f817488caf7b3dab36146a0b |
op_doi |
https://doi.org/10.15356/2076-6734-2012-4-5-16 |
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Ice and Snow |
container_volume |
52 |
container_issue |
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