ICE FLOW BEHAVIOR AT DYE 3,GREENLAND

To understand the flow behavior of large polar ice masses, mechanical property studies have been conducted on deep ice core samples obtained at Dye 3,Greenland during the GISP field operations from 1979 to 1981. A strain rate enhancement factor profile obtained by making uniaxial compression tests s...

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Bibliographic Details
Main Authors: ショウジ ヒトシ /, Hitoshi SHOJI, Chester C. LANGWAY
Format: Report
Language:English
Published: ABSTRACT 1990
Subjects:
Greenland
Tilting
Dye 3
Dye-3
GISP
ice core
Polar meteorology and glaciology
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3621
http://id.nii.ac.jp/1291/00003621/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3621&item_no=1&attribute_id=18&file_no=1
Description
Summary:To understand the flow behavior of large polar ice masses, mechanical property studies have been conducted on deep ice core samples obtained at Dye 3,Greenland during the GISP field operations from 1979 to 1981. A strain rate enhancement factor profile obtained by making uniaxial compression tests shows (1) much higher enhancement factor values for Wisconsin age ice compared with Holocene ice and (2) characteristic changes in the enhancement factor value for the Wisconsin ice depth zone. These results were incorporated to calculate both horizontal and vertical flow velocity profiles of ice which are in good agreement with the results of borehole tilting measurements and computer models of flow dynamics. The finding of depth changes in enhancement factor value leads to a consideration of possible formation of boudinage structure. Further studies are required to fully understand the differential flow behavior of large ice sheets.

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