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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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00062017 2023-05-15T13:49:21+02:00 High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Abe-Ouchi, Ayako Fukui, Kotaro Motoyama, Hideaki Hoshina, Yu Nakazawa, Fumio Obase, Takashi Ohno, Hiroshi Oyabu, Ikumi Saito, Fuyuki Sugiura, Konosuke Suzuki, Toshitaka 2022-07 electronic https://doi.org/10.5194/tc-16-2967-2022 https://noa.gwlb.de/receive/cop_mods_00062017 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061356/tc-16-2967-2022.pdf https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-2967-2022 https://noa.gwlb.de/receive/cop_mods_00062017 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061356/tc-16-2967-2022.pdf https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/tc-16-2967-2022 2022-07-31T23:11:40Z 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 Niedersächsisches Online-Archiv NOA Antarctic Austral Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) The Cryosphere 16 7 2967 2983 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Abe-Ouchi, Ayako Fukui, Kotaro Motoyama, Hideaki Hoshina, Yu Nakazawa, Fumio Obase, Takashi Ohno, Hiroshi Oyabu, Ikumi Saito, Fuyuki Sugiura, Konosuke Suzuki, Toshitaka High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years |
topic_facet |
article Verlagsveröffentlichung |
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 |
Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Abe-Ouchi, Ayako Fukui, Kotaro Motoyama, Hideaki Hoshina, Yu Nakazawa, Fumio Obase, Takashi Ohno, Hiroshi Oyabu, Ikumi Saito, Fuyuki Sugiura, Konosuke Suzuki, Toshitaka |
author_facet |
Tsutaki, Shun Fujita, Shuji Kawamura, Kenji Abe-Ouchi, Ayako Fukui, Kotaro Motoyama, Hideaki Hoshina, Yu Nakazawa, Fumio Obase, Takashi Ohno, Hiroshi Oyabu, Ikumi Saito, Fuyuki Sugiura, Konosuke Suzuki, Toshitaka |
author_sort |
Tsutaki, Shun |
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://noa.gwlb.de/receive/cop_mods_00062017 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061356/tc-16-2967-2022.pdf https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf |
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_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-2967-2022 https://noa.gwlb.de/receive/cop_mods_00062017 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061356/tc-16-2967-2022.pdf https://tc.copernicus.org/articles/16/2967/2022/tc-16-2967-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
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 |
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1766251231629541376 |