Ice fabric evolution process understood from anisotropic distribution of a-axis orientation on the GRIP (Greenland) ice core

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概要

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• To better understand how ice fabric evolves in polar ice sheets, we use X-ray diffraction to measure ice crystal orientations. X-ray measurement equipment which can measure the orientation of the c axis and a axis of each crystal in a thin section with high measurement accuracy was developed. In this study, we present a-axes orientation distribution of the deep part of the GRIP (Greenland summit) ice core. At some depths, we find an anisotropic distribution of a-axes orientation. Long-term uniaxial compression tests are also carried out on the GRIP ice core to investigate the ice fabric evolution process. The c-axis orientation distribution develops into a stronger single maximum as the strain increases up to about 20% strain. We find that the a axes of each grain also tend to cluster close to nearly a mutual direction. We discuss the development process of ice fabrics, taking into consideration the distribution of the a-axis orientations. It is suggested that these fabrics may be attributed to a local simple shear deformation in the deep part of an ice sheet.

• International Glaciological Societyの論文

著者

• Watanabe Okitsugu

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

• 宮本 淳

  北海道大学低温科学研究所

• 本堂 武夫

  北大

• Miyamoto Atsushi

  Kitami Institute of Technology

• Watanabe O

  National Institute Of Polar Research Research Organization Of Information And Systems

• Watanabe Okitsusgu

  National Institute of Polar Research

• Hori Akira

  Department Of Materials Science Faculty Of Engineering University Of Tokyo

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