Application of a continuum-mechanical model for the flow of anisotropic polar ice to the EDML core, Antarctica

被引:38
作者
Seddik, Hakime [1 ]
Greve, Ralf [1 ]
Placidi, Luca [2 ]
Hamann, Ilka [3 ]
Gagliardin, Olivier [4 ]
机构
[1] Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan
[2] Univ Roma La Sapienza, Dept Struct & Geotech Engn, I-00184 Rome, Italy
[3] Alfred Wegener Inst Polar & Marine Res, D-27568 Bremerhaven, Germany
[4] Univ Grenoble 1, Lab Glaciol & Geophys Environm, CNRS, F-38402 St Martin Dheres, France
关键词
D O I
10.3189/002214308786570755
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
We present an application of the newly developed CAFFE model (Continuum-mechanical, Anisotropic Flow model based on an anisotropic Flow Enhancement factor) to the EPICA ice core at Kohnen Station, Dronning Maud Land, Antarctica (referred to as the EDML core). A one-dimensional flow model for the site is devised, which includes the anisotropic flow law and the fabric evolution equation of the CAFFE model. Three different solution methods are employed: (1) computing the ice flow based on the flow law of the CAFFE model and the measured fabrics; (2) solving the CAFFE fabric evolution equation under the simplifying assumption of transverse isotropy; and (3) solving the unrestricted CAFFE fabric evolution equation. Method (1) demonstrates clearly the importance of the anisotropic fabric in the ice column for the flow velocity. The anisotropic enhancement factor produced with method (2) agrees reasonably well with that of method (1), even though the measured fabric shows a girdle structure (which breaks the transverse isotropy) in large parts of the ice core. For method (3), we find that the measured fabric is reproduced well by the model down to similar to 2100 m depth. Systematic deviations at greater depths are attributed to the disregard of migration recrystallization in the model.
引用
收藏
页码:631 / 642
页数:12
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