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

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タイトル: Application of a continuum-mechanical model for the flow of anisotropic polar ice to the EDML core, Antarctica
著者: Seddik, Hakime 著作を一覧する
Greve, Ralf 著作を一覧する
Placidi, Luca 著作を一覧する
Hamann, Ilka 著作を一覧する
Gagliardini, Olivier 著作を一覧する
キーワード: Anisotropy
Flow law
Fabric evolution
EDML core
発行日: 2008年12月
出版者: International Glaciological Society
誌名: Journal of Glaciology
巻: 54
号: 187
開始ページ: 631
終了ページ: 642
出版社 DOI: 10.3189/002214308786570755
抄録: 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, DronningMaud 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: (i) computing the ice flow based on the flow law of the CAFFE model and the measured fabrics; (ii) solving the CAFFE fabric evolution equation under the simplifying assumption of transverse isotropy; and (iii) solving the unrestricted CAFFE fabric evolution equation. Method (i) demonstrates clearly the importance of the anisotropic fabric in the ice column for the flow velocity. The anisotropic enhancement factor produced with method (ii) agrees reasonably well with that of method (i), even though the measured fabric shows a girdle structure (which breaks the transverse isotropy) in large parts of the ice core. For method (iii), we find that the measured fabric is reproduced well by the model down to ~2100m depth. Systematic deviations at greater depths are attributed to the disregard of migration recrystallization in the model.
Rights: © 2008 International Glaciological Society
Relation (URI):
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: Greve Ralf


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