Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling
To resolve the mechanisms behind the major climate reorganisation, which occurred between 0.9 and 1.2 Ma, the recovery of a suitable 1.5 million-year-old ice core is fundamental. The quest for an Oldest Ice core requires a number of key boundary conditions, of which the poorly known basal geothermal...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:9eca78c99ba74709b75430883b9a034b 2023-05-15T13:43:55+02:00 Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling B. Van Liefferinge F. Pattyn M. G. P. Cavitte N. B. Karlsson D. A. Young J. Sutter O. Eisen 2018-08-01 https://www.the-cryosphere.net/12/2773/2018/tc-12-2773-2018.pdf https://doaj.org/article/9eca78c99ba74709b75430883b9a034b en eng Copernicus Publications 1994-0416 1994-0424 https://www.the-cryosphere.net/12/2773/2018/tc-12-2773-2018.pdf https://doaj.org/article/9eca78c99ba74709b75430883b9a034b undefined The Cryosphere, Vol 12, Pp 2773-2787 (2018) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple 2023-01-22T18:03:53Z To resolve the mechanisms behind the major climate reorganisation, which occurred between 0.9 and 1.2 Ma, the recovery of a suitable 1.5 million-year-old ice core is fundamental. The quest for an Oldest Ice core requires a number of key boundary conditions, of which the poorly known basal geothermal heat flux (GHF) is lacking. We use a transient thermodynamical 1-D vertical model that solves for the rate of change of temperature in the vertical, with surface temperature and modelled GHF as boundary conditions. For each point on the ice sheet, the model is forced with variations in atmospheric conditions over the last 2 Ma and modelled ice-thickness variations. The process is repeated for a range of GHF values to determine the value of GHF that marks the limit between frozen and melting conditions over the whole ice sheet, taking into account 2 Ma of climate history. These threshold values of GHF are statistically compared to existing GHF data sets. The new probabilistic GHF fields obtained for the ice sheet thus provide the missing boundary conditions in the search for Oldest Ice. High spatial resolution radar data are examined locally in the Dome Fuji and Dome C regions, as these represent the ice core community's primary drilling sites. GHF, bedrock variability, ice thickness and other essential criteria combined highlight a dozen major potential Oldest Ice sites in the vicinity of Dome Fuji and Dome C, where GHF could allow for Oldest Ice. Article in Journal/Newspaper Antarc* Antarctica East Antarctica ice core Ice Sheet The Cryosphere Unknown Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) East Antarctica |
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language |
English |
topic |
geo envir |
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geo envir B. Van Liefferinge F. Pattyn M. G. P. Cavitte N. B. Karlsson D. A. Young J. Sutter O. Eisen Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling |
topic_facet |
geo envir |
description |
To resolve the mechanisms behind the major climate reorganisation, which occurred between 0.9 and 1.2 Ma, the recovery of a suitable 1.5 million-year-old ice core is fundamental. The quest for an Oldest Ice core requires a number of key boundary conditions, of which the poorly known basal geothermal heat flux (GHF) is lacking. We use a transient thermodynamical 1-D vertical model that solves for the rate of change of temperature in the vertical, with surface temperature and modelled GHF as boundary conditions. For each point on the ice sheet, the model is forced with variations in atmospheric conditions over the last 2 Ma and modelled ice-thickness variations. The process is repeated for a range of GHF values to determine the value of GHF that marks the limit between frozen and melting conditions over the whole ice sheet, taking into account 2 Ma of climate history. These threshold values of GHF are statistically compared to existing GHF data sets. The new probabilistic GHF fields obtained for the ice sheet thus provide the missing boundary conditions in the search for Oldest Ice. High spatial resolution radar data are examined locally in the Dome Fuji and Dome C regions, as these represent the ice core community's primary drilling sites. GHF, bedrock variability, ice thickness and other essential criteria combined highlight a dozen major potential Oldest Ice sites in the vicinity of Dome Fuji and Dome C, where GHF could allow for Oldest Ice. |
format |
Article in Journal/Newspaper |
author |
B. Van Liefferinge F. Pattyn M. G. P. Cavitte N. B. Karlsson D. A. Young J. Sutter O. Eisen |
author_facet |
B. Van Liefferinge F. Pattyn M. G. P. Cavitte N. B. Karlsson D. A. Young J. Sutter O. Eisen |
author_sort |
B. Van Liefferinge |
title |
Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling |
title_short |
Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling |
title_full |
Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling |
title_fullStr |
Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling |
title_full_unstemmed |
Promising Oldest Ice sites in East Antarctica based on thermodynamical modelling |
title_sort |
promising oldest ice sites in east antarctica based on thermodynamical modelling |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://www.the-cryosphere.net/12/2773/2018/tc-12-2773-2018.pdf https://doaj.org/article/9eca78c99ba74709b75430883b9a034b |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Dome Fuji East Antarctica |
geographic_facet |
Dome Fuji East Antarctica |
genre |
Antarc* Antarctica East Antarctica ice core Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctica East Antarctica ice core Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 12, Pp 2773-2787 (2018) |
op_relation |
1994-0416 1994-0424 https://www.the-cryosphere.net/12/2773/2018/tc-12-2773-2018.pdf https://doaj.org/article/9eca78c99ba74709b75430883b9a034b |
op_rights |
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_version_ |
1766194959653797888 |