A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica
The recovery of a new Antarctic ice core spanning the last ~1.5 million years will advance our understanding of climate system dynamics during the Quaternary. Recent glaciological field surveys have been conducted to select the most suitable core location near Dome Fuji (DF), Antarctica. Specificall...
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ftcopernicus:oai:publications.copernicus.org:tcd107005 2023-05-15T13:38:41+02:00 A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica Obase, Takashi Abe-Ouchi, Ayako Saito, Fuyuki Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Motoyama, Hideaki 2022-10-26 application/pdf https://doi.org/10.5194/tc-2022-204 https://tc.copernicus.org/preprints/tc-2022-204/ eng eng doi:10.5194/tc-2022-204 https://tc.copernicus.org/preprints/tc-2022-204/ eISSN: 1994-0424 Text 2022 ftcopernicus https://doi.org/10.5194/tc-2022-204 2022-10-31T17:22:43Z The recovery of a new Antarctic ice core spanning the last ~1.5 million years will advance our understanding of climate system dynamics during the Quaternary. Recent glaciological field surveys have been conducted to select the most suitable core location near Dome Fuji (DF), Antarctica. Specifically, ground-based radar-echo soundings have been used to acquire highly detailed images of bedrock topography and internal ice layers. In this study, we use a one-dimensional (1-D) ice flow model to compute the temporal evolutions of age and temperature, in which the ice flow is linked with not only transient climate forcing associated with past glacial‒interglacial cycles, but also transient basal melting diagnosed along the evolving temperature profile. We investigated the influence of ice thickness, accumulation rate, and geothermal heat flux on the age and temperature profiles. The model was constrained by the observed temperature and age profiles reconstructed from DF ice‒core analysis. The results of sensitivity experiments indicate that ice thickness is the most crucial parameter influencing the computed age of the ice because it is critical to the history of basal temperature and basal melting, which can eliminate old ice. The 1-D model was applied to a 54 km long transect in the vicinity of DF and compared with radargram data. We found that the basal age of the ice is mostly controlled by the local ice thickness, demonstrating the importance of high spatial resolution surveys of bedrock topography for selecting ice-core drilling sites. Text Antarc* Antarctic Antarctica ice core Copernicus Publications: E-Journals Antarctic Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The recovery of a new Antarctic ice core spanning the last ~1.5 million years will advance our understanding of climate system dynamics during the Quaternary. Recent glaciological field surveys have been conducted to select the most suitable core location near Dome Fuji (DF), Antarctica. Specifically, ground-based radar-echo soundings have been used to acquire highly detailed images of bedrock topography and internal ice layers. In this study, we use a one-dimensional (1-D) ice flow model to compute the temporal evolutions of age and temperature, in which the ice flow is linked with not only transient climate forcing associated with past glacial‒interglacial cycles, but also transient basal melting diagnosed along the evolving temperature profile. We investigated the influence of ice thickness, accumulation rate, and geothermal heat flux on the age and temperature profiles. The model was constrained by the observed temperature and age profiles reconstructed from DF ice‒core analysis. The results of sensitivity experiments indicate that ice thickness is the most crucial parameter influencing the computed age of the ice because it is critical to the history of basal temperature and basal melting, which can eliminate old ice. The 1-D model was applied to a 54 km long transect in the vicinity of DF and compared with radargram data. We found that the basal age of the ice is mostly controlled by the local ice thickness, demonstrating the importance of high spatial resolution surveys of bedrock topography for selecting ice-core drilling sites. |
format |
Text |
author |
Obase, Takashi Abe-Ouchi, Ayako Saito, Fuyuki Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Motoyama, Hideaki |
spellingShingle |
Obase, Takashi Abe-Ouchi, Ayako Saito, Fuyuki Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Motoyama, Hideaki A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica |
author_facet |
Obase, Takashi Abe-Ouchi, Ayako Saito, Fuyuki Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Motoyama, Hideaki |
author_sort |
Obase, Takashi |
title |
A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica |
title_short |
A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica |
title_full |
A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica |
title_fullStr |
A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica |
title_full_unstemmed |
A one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around Dome Fuji, Antarctica |
title_sort |
one-dimensional temperature and age modeling study for selecting the drill site of the oldest ice core around dome fuji, antarctica |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-2022-204 https://tc.copernicus.org/preprints/tc-2022-204/ |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Dome Fuji |
geographic_facet |
Antarctic Dome Fuji |
genre |
Antarc* Antarctic Antarctica ice core |
genre_facet |
Antarc* Antarctic Antarctica ice core |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2022-204 https://tc.copernicus.org/preprints/tc-2022-204/ |
op_doi |
https://doi.org/10.5194/tc-2022-204 |
_version_ |
1766109637941133312 |