Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results
Polycrystalline ice is known to exhibit macroscopic anisotropy in relative permittivity (ɛ) depending on the crystal orientation fabric (COF). Using a new system designed to measure the tensorial components of ɛ, we investigated the dielectric anisotropy (Δɛ) of a deep ice core sample obtained from...
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Cambridge University Press
2022
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ftdoajarticles:oai:doaj.org/article:81ca86f6b9bd48d2a74ba362e8ec65b1 2023-05-15T13:33:04+02:00 Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results Tomotaka Saruya Shuji Fujita Ryo Inoue 2022-02-01T00:00:00Z https://doi.org/10.1017/jog.2021.73 https://doaj.org/article/81ca86f6b9bd48d2a74ba362e8ec65b1 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021000733/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.73 0022-1430 1727-5652 https://doaj.org/article/81ca86f6b9bd48d2a74ba362e8ec65b1 Journal of Glaciology, Vol 68, Pp 65-76 (2022) Glaciological instruments and methods ice core ice physics structural glaciology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.1017/jog.2021.73 2023-03-12T01:30:57Z Polycrystalline ice is known to exhibit macroscopic anisotropy in relative permittivity (ɛ) depending on the crystal orientation fabric (COF). Using a new system designed to measure the tensorial components of ɛ, we investigated the dielectric anisotropy (Δɛ) of a deep ice core sample obtained from Dome Fuji, East Antarctica. This technique permits the continuous nondestructive assessment of the COF in thick ice sections. Measurements of vertical prism sections along the core showed that the Δɛ values in the vertical direction increased with increasing depth, supporting previous findings of c-axis clustering around the vertical direction. Analyses of horizontal disk sections demonstrated that the magnitude of Δɛ in the horizontal plane was 10–15% of that in the vertical plane. In addition, the directions of the principal axes of tensorial ɛ in the horizontal plane corresponded to the long or short axis of the elliptically elongated single-pole maximum COF. The data confirmed that Δɛ in the vertical and horizontal planes adequately indicated the preferred orientations of the c-axes, and that Δɛ can be considered to represent a direct substitute for the normalized COF eigenvalues. This new method could be extremely useful as a means of investigating continuous and depth-dependent variations in COF. Article in Journal/Newspaper Antarc* Antarctica East Antarctica ice core Journal of Glaciology Directory of Open Access Journals: DOAJ Articles East Antarctica Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Journal of Glaciology 68 267 65 76 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glaciological instruments and methods ice core ice physics structural glaciology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Glaciological instruments and methods ice core ice physics structural glaciology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Tomotaka Saruya Shuji Fujita Ryo Inoue Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results |
topic_facet |
Glaciological instruments and methods ice core ice physics structural glaciology Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Polycrystalline ice is known to exhibit macroscopic anisotropy in relative permittivity (ɛ) depending on the crystal orientation fabric (COF). Using a new system designed to measure the tensorial components of ɛ, we investigated the dielectric anisotropy (Δɛ) of a deep ice core sample obtained from Dome Fuji, East Antarctica. This technique permits the continuous nondestructive assessment of the COF in thick ice sections. Measurements of vertical prism sections along the core showed that the Δɛ values in the vertical direction increased with increasing depth, supporting previous findings of c-axis clustering around the vertical direction. Analyses of horizontal disk sections demonstrated that the magnitude of Δɛ in the horizontal plane was 10–15% of that in the vertical plane. In addition, the directions of the principal axes of tensorial ɛ in the horizontal plane corresponded to the long or short axis of the elliptically elongated single-pole maximum COF. The data confirmed that Δɛ in the vertical and horizontal planes adequately indicated the preferred orientations of the c-axes, and that Δɛ can be considered to represent a direct substitute for the normalized COF eigenvalues. This new method could be extremely useful as a means of investigating continuous and depth-dependent variations in COF. |
format |
Article in Journal/Newspaper |
author |
Tomotaka Saruya Shuji Fujita Ryo Inoue |
author_facet |
Tomotaka Saruya Shuji Fujita Ryo Inoue |
author_sort |
Tomotaka Saruya |
title |
Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results |
title_short |
Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results |
title_full |
Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results |
title_fullStr |
Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results |
title_full_unstemmed |
Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results |
title_sort |
dielectric anisotropy as indicator of crystal orientation fabric in dome fuji ice core: method and initial results |
publisher |
Cambridge University Press |
publishDate |
2022 |
url |
https://doi.org/10.1017/jog.2021.73 https://doaj.org/article/81ca86f6b9bd48d2a74ba362e8ec65b1 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
East Antarctica Dome Fuji |
geographic_facet |
East Antarctica Dome Fuji |
genre |
Antarc* Antarctica East Antarctica ice core Journal of Glaciology |
genre_facet |
Antarc* Antarctica East Antarctica ice core Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 68, Pp 65-76 (2022) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021000733/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.73 0022-1430 1727-5652 https://doaj.org/article/81ca86f6b9bd48d2a74ba362e8ec65b1 |
op_doi |
https://doi.org/10.1017/jog.2021.73 |
container_title |
Journal of Glaciology |
container_volume |
68 |
container_issue |
267 |
container_start_page |
65 |
op_container_end_page |
76 |
_version_ |
1766038249922363392 |