High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years
The retrieval of continuous ice core records of more than 1 Myr is an important challenge in palaeo-climatology. For identifying suitable sites for drilling such ice, knowledge of the subglacial topography and englacial layering is crucial. For this purpose, extensive ground-based ice radar surveys...
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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/tc-16-2967-2022 https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf https://doaj.org/article/b56f92c11ec1461d84c2b846790d9c2b |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:b56f92c11ec1461d84c2b846790d9c2b 2023-05-15T13:32:51+02:00 High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years S. Tsutaki S. Fujita K. Kawamura A. Abe-Ouchi K. Fukui H. Motoyama Y. Hoshina F. Nakazawa T. Obase H. Ohno I. Oyabu F. Saito K. Sugiura T. Suzuki 2022-07-01 https://doi.org/10.5194/tc-16-2967-2022 https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf https://doaj.org/article/b56f92c11ec1461d84c2b846790d9c2b en eng Copernicus Publications doi:10.5194/tc-16-2967-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf https://doaj.org/article/b56f92c11ec1461d84c2b846790d9c2b undefined The Cryosphere, Vol 16, Pp 2967-2983 (2022) geo info Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/tc-16-2967-2022 2023-01-22T17:50:45Z The retrieval of continuous ice core records of more than 1 Myr is an important challenge in palaeo-climatology. For identifying suitable sites for drilling such ice, knowledge of the subglacial topography and englacial layering is crucial. For this purpose, extensive ground-based ice radar surveys were carried out over Dome Fuji in the East Antarctic plateau during the 2017/18 and 2018/19 austral summers by the Japanese Antarctic Research Expedition, on the basis of ground-based radar surveys conducted over the previous ∼ 30 years. High-gain Yagi antennae were used to improve the antenna beam directivity, thereby significantly decreasing hyperbolic features of unfocused along-track diffraction hyperbolae in the echoes from mountainous ice–bedrock interfaces. We combined the new ice thickness data with the previous ground-based data, recorded since the 1980s, to generate an accurate high-spatial-resolution (up to 0.5 km between survey lines) ice thickness map. This map revealed a complex landscape composed of networks of subglacial valleys and highlands. Based on the new map, we examined the roughness of the ice–bed interface, the bed surface slope, the driving stress of ice and the subglacial hydrological condition. These new products and analyses set substantial constraints on identifying possible locations for new drilling. In addition, our map was compared with a few bed maps compiled by earlier independent efforts based on airborne radar data to examine the difference in features between datasets. Our analysis suggests that widely available bed topography products should be validated with in situ observations where possible. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core The Cryosphere Unknown Antarctic Austral Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) The Cryosphere 16 7 2967 2983 |
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Open Polar |
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fttriple |
language |
English |
topic |
geo info |
spellingShingle |
geo info S. Tsutaki S. Fujita K. Kawamura A. Abe-Ouchi K. Fukui H. Motoyama Y. Hoshina F. Nakazawa T. Obase H. Ohno I. Oyabu F. Saito K. Sugiura T. Suzuki High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years |
topic_facet |
geo info |
description |
The retrieval of continuous ice core records of more than 1 Myr is an important challenge in palaeo-climatology. For identifying suitable sites for drilling such ice, knowledge of the subglacial topography and englacial layering is crucial. For this purpose, extensive ground-based ice radar surveys were carried out over Dome Fuji in the East Antarctic plateau during the 2017/18 and 2018/19 austral summers by the Japanese Antarctic Research Expedition, on the basis of ground-based radar surveys conducted over the previous ∼ 30 years. High-gain Yagi antennae were used to improve the antenna beam directivity, thereby significantly decreasing hyperbolic features of unfocused along-track diffraction hyperbolae in the echoes from mountainous ice–bedrock interfaces. We combined the new ice thickness data with the previous ground-based data, recorded since the 1980s, to generate an accurate high-spatial-resolution (up to 0.5 km between survey lines) ice thickness map. This map revealed a complex landscape composed of networks of subglacial valleys and highlands. Based on the new map, we examined the roughness of the ice–bed interface, the bed surface slope, the driving stress of ice and the subglacial hydrological condition. These new products and analyses set substantial constraints on identifying possible locations for new drilling. In addition, our map was compared with a few bed maps compiled by earlier independent efforts based on airborne radar data to examine the difference in features between datasets. Our analysis suggests that widely available bed topography products should be validated with in situ observations where possible. |
format |
Article in Journal/Newspaper |
author |
S. Tsutaki S. Fujita K. Kawamura A. Abe-Ouchi K. Fukui H. Motoyama Y. Hoshina F. Nakazawa T. Obase H. Ohno I. Oyabu F. Saito K. Sugiura T. Suzuki |
author_facet |
S. Tsutaki S. Fujita K. Kawamura A. Abe-Ouchi K. Fukui H. Motoyama Y. Hoshina F. Nakazawa T. Obase H. Ohno I. Oyabu F. Saito K. Sugiura T. Suzuki |
author_sort |
S. Tsutaki |
title |
High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years |
title_short |
High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years |
title_full |
High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years |
title_fullStr |
High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years |
title_full_unstemmed |
High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years |
title_sort |
high-resolution subglacial topography around dome fuji, antarctica, based on ground-based radar surveys over 30 years |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-2967-2022 https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf https://doaj.org/article/b56f92c11ec1461d84c2b846790d9c2b |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Austral Dome Fuji |
geographic_facet |
Antarctic Austral Dome Fuji |
genre |
Antarc* Antarctic Antarctica ice core The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica ice core The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 2967-2983 (2022) |
op_relation |
doi:10.5194/tc-16-2967-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf https://doaj.org/article/b56f92c11ec1461d84c2b846790d9c2b |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-16-2967-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
7 |
container_start_page |
2967 |
op_container_end_page |
2983 |
_version_ |
1766036619215765504 |