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Recent Thinning of the Ice Sheet Near Mizuho Station, East Antarctica

Published online by Cambridge University Press:  20 January 2017

M. Nakawo ,
S. Fujita ,
S. Mae ,
S. Takahashi ,
O. Watanabe ,
F. Nishio  and
F. Okuhira
M. Nakawo
Affiliation:
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
S. Fujita
Affiliation:
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
S. Mae
Affiliation:
Kitami Institute of Technology, Kitami 090, Japan
S. Takahashi
Affiliation:
Kitami Institute of Technology, Kitami 090, Japan
O. Watanabe
Affiliation:
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
F. Nishio
Affiliation:
National Institute of Polar Research, Kaga 1-9-10, Itabashi-ku, Tokyo 173, Japan
F. Okuhira
Affiliation:
Gifu Prefectural Research Institute for Environmental Pollution, Yabuta, Gifu 500, Japan
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Abstract

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Type
Abstracts of Papers Presented at the Symposium but not Published in this Volume
Information
Annals of Glaciology , Volume 12 , 1989 , pp. 204
Copyright
Copyright © International Glaciological Society 1989

A 700 m long ice core from Mizuho Station has been analyzed. The orientation of the core was determined by examining the remanent magnetization of frozen “ice jam”, which was formed accidentally on top of core segments during drilling. Referring to the core orientation, it was possible to re-investigate the structural characteristics of the core with respect to the stress and strain conditions at the surface.

It was found that the ice fabric throughout the core was a great-girdle pattern, which was on a vertical plane normal to the tensile axis and the flow direction at the surface. The fabric pattern was considered to have formed with increasing tensile strain in the direction of flow. Computer simulation was carried out on the formation of the great-girdle pattern. Comparing the core data with the simulation, the accumulated strain in the core ice was found to increase almost linearly with depth. From this information and the vertical strain-rate of the ice sheet measured in situ, recent thinning of the ice sheet is discussed.