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Ice-sheet flow conditions deduced from mechanical tests of ice core
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| Zeitschriftentitel: | Annals of Glaciology |
|---|---|
| Personen und Körperschaften: | , , , , , , , , , |
| In: | Annals of Glaciology, 29, 1999, S. 179-183 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
International Glaciological Society
|
| Schlagwörter: |
| author_facet |
Miyamoto, Atsushi Narita, Hideki Hondoh, Takeo Shoji, Hitoshi Kawada, Kunio Watanabe, Okitsugu Dahl-Jensen, Dorthe Gundestrup, Niels S. Clausen, Henrik B. Duval, Paul Miyamoto, Atsushi Narita, Hideki Hondoh, Takeo Shoji, Hitoshi Kawada, Kunio Watanabe, Okitsugu Dahl-Jensen, Dorthe Gundestrup, Niels S. Clausen, Henrik B. Duval, Paul |
|---|---|
| author |
Miyamoto, Atsushi Narita, Hideki Hondoh, Takeo Shoji, Hitoshi Kawada, Kunio Watanabe, Okitsugu Dahl-Jensen, Dorthe Gundestrup, Niels S. Clausen, Henrik B. Duval, Paul |
| spellingShingle |
Miyamoto, Atsushi Narita, Hideki Hondoh, Takeo Shoji, Hitoshi Kawada, Kunio Watanabe, Okitsugu Dahl-Jensen, Dorthe Gundestrup, Niels S. Clausen, Henrik B. Duval, Paul Annals of Glaciology Ice-sheet flow conditions deduced from mechanical tests of ice core Earth-Surface Processes |
| author_sort |
miyamoto, atsushi |
| spelling |
Miyamoto, Atsushi Narita, Hideki Hondoh, Takeo Shoji, Hitoshi Kawada, Kunio Watanabe, Okitsugu Dahl-Jensen, Dorthe Gundestrup, Niels S. Clausen, Henrik B. Duval, Paul 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756499781820950 <jats:title>Abstract</jats:title><jats:p>Uniaxial compression tests were performed on samples of the Greenland Ice Gore Project (GRIP) deep ice core, both in the field and later in a cold-room laboratory, in order to understand the ice-flow behavior of large ice sheets. Experiments were conducted under conditions of constant strain rate (type A) and constant load (type B). Fifty-four uniaxial-compression test specimens from 1327-2922 m were selected. Each test specimen (25 mm x 25 mm x 90 mm) was prepared with its uniaxial stress axis inclined 45° from the core axis in order to examine the flow behavior of strong single-maximum ice-core samples with basal planes parallel to the horizontal plane of the ice sheet. The ice-flow enhancement factors show a gradual increase with depth down to approximately 2000 m. These results can be interpreted in terms of an increase in the fourth-order Schmid factor. Below 2000 m depth, the flow-enhancement factor increases to about 20-30 with a relatively high variability When the Schmid factor was > 0.46, the enhancement factor obtained was higher than expected from the .-axis concentrations measured. The higher values of flow-enhancement factor were obtained from specimens with a cloudy band structure. It was revealed that cloudy bands affect ice-deformation processes, but the details remain unclear.</jats:p> Ice-sheet flow conditions deduced from mechanical tests of ice core Annals of Glaciology |
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International Glaciological Society, 1999 |
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International Glaciological Society, 1999 |
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1999 |
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International Glaciological Society |
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Annals of Glaciology |
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49 |
| title |
Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_unstemmed |
Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_full |
Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_fullStr |
Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_full_unstemmed |
Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_short |
Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_sort |
ice-sheet flow conditions deduced from mechanical tests of ice core |
| topic |
Earth-Surface Processes |
| url |
http://dx.doi.org/10.3189/172756499781820950 |
| publishDate |
1999 |
| physical |
179-183 |
| description |
<jats:title>Abstract</jats:title><jats:p>Uniaxial compression tests were performed on samples of the Greenland Ice Gore Project (GRIP) deep ice core, both in the field and later in a cold-room laboratory, in order to understand the ice-flow behavior of large ice sheets. Experiments were conducted under conditions of constant strain rate (type A) and constant load (type B). Fifty-four uniaxial-compression test specimens from 1327-2922 m were selected. Each test specimen (25 mm x 25 mm x 90 mm) was prepared with its uniaxial stress axis inclined 45° from the core axis in order to examine the flow behavior of strong single-maximum ice-core samples with basal planes parallel to the horizontal plane of the ice sheet. The ice-flow enhancement factors show a gradual increase with depth down to approximately 2000 m. These results can be interpreted in terms of an increase in the fourth-order Schmid factor. Below 2000 m depth, the flow-enhancement factor increases to about 20-30 with a relatively high variability When the Schmid factor was > 0.46, the enhancement factor obtained was higher than expected from the .-axis concentrations measured. The higher values of flow-enhancement factor were obtained from specimens with a cloudy band structure. It was revealed that cloudy bands affect ice-deformation processes, but the details remain unclear.</jats:p> |
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| author | Miyamoto, Atsushi, Narita, Hideki, Hondoh, Takeo, Shoji, Hitoshi, Kawada, Kunio, Watanabe, Okitsugu, Dahl-Jensen, Dorthe, Gundestrup, Niels S., Clausen, Henrik B., Duval, Paul |
| author_facet | Miyamoto, Atsushi, Narita, Hideki, Hondoh, Takeo, Shoji, Hitoshi, Kawada, Kunio, Watanabe, Okitsugu, Dahl-Jensen, Dorthe, Gundestrup, Niels S., Clausen, Henrik B., Duval, Paul, Miyamoto, Atsushi, Narita, Hideki, Hondoh, Takeo, Shoji, Hitoshi, Kawada, Kunio, Watanabe, Okitsugu, Dahl-Jensen, Dorthe, Gundestrup, Niels S., Clausen, Henrik B., Duval, Paul |
| author_sort | miyamoto, atsushi |
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| container_title | Annals of Glaciology |
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| description | <jats:title>Abstract</jats:title><jats:p>Uniaxial compression tests were performed on samples of the Greenland Ice Gore Project (GRIP) deep ice core, both in the field and later in a cold-room laboratory, in order to understand the ice-flow behavior of large ice sheets. Experiments were conducted under conditions of constant strain rate (type A) and constant load (type B). Fifty-four uniaxial-compression test specimens from 1327-2922 m were selected. Each test specimen (25 mm x 25 mm x 90 mm) was prepared with its uniaxial stress axis inclined 45° from the core axis in order to examine the flow behavior of strong single-maximum ice-core samples with basal planes parallel to the horizontal plane of the ice sheet. The ice-flow enhancement factors show a gradual increase with depth down to approximately 2000 m. These results can be interpreted in terms of an increase in the fourth-order Schmid factor. Below 2000 m depth, the flow-enhancement factor increases to about 20-30 with a relatively high variability When the Schmid factor was > 0.46, the enhancement factor obtained was higher than expected from the .-axis concentrations measured. The higher values of flow-enhancement factor were obtained from specimens with a cloudy band structure. It was revealed that cloudy bands affect ice-deformation processes, but the details remain unclear.</jats:p> |
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| imprint | International Glaciological Society, 1999 |
| imprint_str_mv | International Glaciological Society, 1999 |
| institution | DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229 |
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| language | English |
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| match_str | miyamoto1999icesheetflowconditionsdeducedfrommechanicaltestsoficecore |
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| physical | 179-183 |
| publishDate | 1999 |
| publishDateSort | 1999 |
| publisher | International Glaciological Society |
| record_format | ai |
| recordtype | ai |
| series | Annals of Glaciology |
| source_id | 49 |
| spelling | Miyamoto, Atsushi Narita, Hideki Hondoh, Takeo Shoji, Hitoshi Kawada, Kunio Watanabe, Okitsugu Dahl-Jensen, Dorthe Gundestrup, Niels S. Clausen, Henrik B. Duval, Paul 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756499781820950 <jats:title>Abstract</jats:title><jats:p>Uniaxial compression tests were performed on samples of the Greenland Ice Gore Project (GRIP) deep ice core, both in the field and later in a cold-room laboratory, in order to understand the ice-flow behavior of large ice sheets. Experiments were conducted under conditions of constant strain rate (type A) and constant load (type B). Fifty-four uniaxial-compression test specimens from 1327-2922 m were selected. Each test specimen (25 mm x 25 mm x 90 mm) was prepared with its uniaxial stress axis inclined 45° from the core axis in order to examine the flow behavior of strong single-maximum ice-core samples with basal planes parallel to the horizontal plane of the ice sheet. The ice-flow enhancement factors show a gradual increase with depth down to approximately 2000 m. These results can be interpreted in terms of an increase in the fourth-order Schmid factor. Below 2000 m depth, the flow-enhancement factor increases to about 20-30 with a relatively high variability When the Schmid factor was > 0.46, the enhancement factor obtained was higher than expected from the .-axis concentrations measured. The higher values of flow-enhancement factor were obtained from specimens with a cloudy band structure. It was revealed that cloudy bands affect ice-deformation processes, but the details remain unclear.</jats:p> Ice-sheet flow conditions deduced from mechanical tests of ice core Annals of Glaciology |
| spellingShingle | Miyamoto, Atsushi, Narita, Hideki, Hondoh, Takeo, Shoji, Hitoshi, Kawada, Kunio, Watanabe, Okitsugu, Dahl-Jensen, Dorthe, Gundestrup, Niels S., Clausen, Henrik B., Duval, Paul, Annals of Glaciology, Ice-sheet flow conditions deduced from mechanical tests of ice core, Earth-Surface Processes |
| title | Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_full | Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_fullStr | Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_full_unstemmed | Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_short | Ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_sort | ice-sheet flow conditions deduced from mechanical tests of ice core |
| title_unstemmed | Ice-sheet flow conditions deduced from mechanical tests of ice core |
| topic | Earth-Surface Processes |
| url | http://dx.doi.org/10.3189/172756499781820950 |