UNIAXIAL COMPRESSION TESTS OF SHALLOW ICE CORES FROM POLAR ICE SHEETS

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概要

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• 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.

• 国立極地研究所の論文

著者

• Fujii Yoshiyuki

  National Institute of Polar Research, Research Organization of Information and Systems

• Shoji Hitoshi

  Faculty Of Science Toyama University

• KURODA Takao

  Faculty of Science, Toyama University

• KOBAYASHI Masanori

  Faculty of Science, Toyama University

• Fujii Yoshiyuki

  National Institute Of Polar Research

• Kuroda Takao

  Faculty Of Science Toyama University

• Kobayashi Masanori

  Faculty Of Science Toyama University

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• Preface
• Glaciological Data Collected by the 30th, 31st and 32nd Japanese Antarctic Research Expeditions in 1989-1991
• 5. Surface Meteorological Data during Oversnow Traverses(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
• 4. Snow Temperature Data at Dome Fuji Station(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
• 3. Surface Snow Density around Dome Fuji Station(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
• 2. Net Accumulation of Snow at Dome Fuji Station(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
• 1. Outline of Field Observations during 1996-1997(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
• Geomorphological and glaciological aspects around the highest dome in Queen Maud Land, East Antarctica
• Neutron activation analysis of spherules from bare ice near the Allan Hills and an ice core from Mizuho Station (abstract)
• Instrumental neutron activation analyses of the spherules from the Mizuho ice core (abstract)
• Semiannual Variation of Microparticle Concentration in Snow Drift at Mizuho Station, Antarctica in 1977
• Seasonal variation of pH values in snow at Halley Base and Mizuho Station, Antarctica (abstract)
• Seasonal variation of oxygen isotopic composition of drifting snow at Mizuho Station, East Antarctica (abstract)
• Past 30-year pH record in a firm core from the Brust Ice Shelf, Antarctica, and its relationship to volcanic events
• Formation of Surface Snow Layer at Mizuho Station, Antarctica
• Comparison of the Seasonal Meteorological Variations between Mizuho and Syowa Stations, Antarctica in 1977
• Determination of Methane Concentration in Air Extracted from Antarctic Ice Core Samples.
• Observation of Snow Particles at Hidden Valley, Mukut Himal:Glaciological Expedition of Nepal, Contribution No. 50
• Preliminary Investigations of Sediment Core Samples from the Tsola-Tso Lake, Khumbu Himal:Glaciological Expedition of Nepal, Contribution No. 77

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