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UNIAXIAL COMPRESSION TESTS OF SHALLOW ICE CORES FROM POLAR ICE SHEETS
https://doi.org/10.15094/00003721
https://doi.org/10.15094/000037213cb2ef2d-5ba0-44a4-9317-e165c5bf4efe
名前 / ファイル | ライセンス | アクション |
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KJ00002409950 (75.1 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1992-02-01 | |||||
タイトル | ||||||
タイトル | UNIAXIAL COMPRESSION TESTS OF SHALLOW ICE CORES FROM POLAR ICE SHEETS | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00003721 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
記事種別(英) | ||||||
en | ||||||
ABSTRACT | ||||||
論文名よみ | ||||||
その他のタイトル | UNIAXIAL COMPRESSION TESTS OF SHALLOW ICE CORES FROM POLAR ICE SHEETS | |||||
著者名よみ |
ショウジ, ヒトシ
× ショウジ, ヒトシ× クロダ, タカオ× コバヤシ, マサノリ× フジイ, ヨシユキ |
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著者名(英) |
SHOJI, Hitoshi
× SHOJI, Hitoshi× KURODA, Takao× KOBAYASHI, Masanori× FUJII, Yoshiyuki |
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著者所属(英) | ||||||
en | ||||||
Faculty of Science, Toyama University | ||||||
著者所属(英) | ||||||
en | ||||||
Faculty of Science, Toyama University | ||||||
著者所属(英) | ||||||
en | ||||||
Faculty of Science, Toyama University | ||||||
著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Uniaxial compression tests were carried out on shallow ice core samples from G6,Antarctica (73°S, 40°E) and Site J, Greenland (67°N, 46°W) under constant load. Both firn and glacier ice samples were prepared for the tests to investigate firn densification processes and glacier flow behavior, respectively. Six firn samples were obtained from depths of 8 to 9m. Sample densities ranged from 0.433 to 0.521g/(cm)^3. Uniaxial compression creep tests were done under a constant stress of 1 bar and constant temperatures ranging between -2 and -10℃ in a cold room. Each sample was deformed for about 100 hours. Experimental results show relatively shorter transient creep regions and slight increase in steady-state creep rates compared with artificial firns sample tests. The densification processes were discussed in terms of bulk ice creep rates by introducing a stress factor, which is given as a ratio of the Fracture Stress (or Young's Modulus) between ice and firn. Eight ice samples were obtained from depths between 99 and 197m, including two samples from the Ice Layer. Experiments were done under constant stresses between 5.3 and 6.5 bars and a constant temperature of -15℃. Crystal orientation distribution for each sample was measured by conducting thin section analysis, and the average Schmid Factor was calculated. Experimental results show that ice layer samples are about 2 times softer than the other samples at the same Schmid Factor level. This softening, possibly caused by impurity enrichment, suggests that vertical perturbations in the ice strength may exist in the percolation and wet-snow zones in Greenland. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10756213 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 巻 5, p. 183, 発行日 1992-02 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |