ICE CRYSTAL ORIENTATION DISTRIBUTIONS IN LARGE ICE MASSES
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概要
- 論文の詳細を見る
Flow behavior of large ice sheets is affected mainly by c-axis orientation fabric, and the fabric formation is caused by the anisotropic characteristics in the plastic deformation property of ice crystal. There are three processes involved in fabric formation; i.e. crystal rotation (AZUMA and HIGASHI, 1985), recrystalization and polygonization. Two types of crystal fabric development with depth have been observed in deep polar ice cores. Type A shows crystal fabric changes from a random distribution near the surface to vertical cluster development with depth under vertical compression and to a strong single maximum pattern near the bottom under simple shear deformation (Camp Century, Dye 3,GRIP and Byrd ice cores). Type B shows fabric changes from a random distribution near the surface to a large girdle development with depth, where the c-axis direction is almost perpendicular to the uniaxial tensile strain axis along the ice flow direction (Mizuho and Vostok ice cores). To estimate vertical compressive strain, ε and uniaxial tensile strain, γ, the following equations were assumed : ε=-ln(y/H), γ=-2ln(y/H), where y is height from the bottom and H is ice thickness. For Type A cores, the c-axis lies mainly along the vertical core direction with depth and a single maximum fabric appears at depth for about ε=150%, except for Byrd core samples which shows single maximum fabric appearance for about ε=80%. For Type B cores, crystal fabrics developments with an increase in γ are quite similar to each other.
- 国立極地研究所の論文
著者
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Narita Hideki
Institute of Low Temperature Science Pan-Okhotsk Research Center, Hokkaido University
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宮本 淳
北海道大学低温科学研究所
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Miyamoto Atsushi
Kitami Institute of Technology
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Narita Hideki
Institute Of Low Temperature Science Pan-okhotsk Research Center Hokkaido University
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Shoji Hitoshi
Department Of Applied Physics Faculty Of Engineering Hokkaido University
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Narita Hideki
Institute Of Low Temperature Science Hokkaido University
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MIYAMOTO Atsushi
Institute of Low Temperature Science, Hokkaido University
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