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Application of a continuum-mechanical model for the flow of anisotropic polar ice to the EDML core, Antarctica
Title: | Application of a continuum-mechanical model for the flow of anisotropic polar ice to the EDML core, Antarctica |
Authors: | Seddik, Hakime Browse this author | Greve, Ralf Browse this author →KAKEN DB | Placidi, Luca Browse this author | Hamann, Ilka Browse this author | Gagliardini, Olivier Browse this author |
Keywords: | Anisotropy | Flow law | Fabric evolution | EDML core | Antarctica |
Issue Date: | Dec-2008 |
Publisher: | International Glaciological Society |
Journal Title: | Journal of Glaciology |
Volume: | 54 |
Issue: | 187 |
Start Page: | 631 |
End Page: | 642 |
Publisher DOI: | 10.3189/002214308786570755 |
Abstract: | 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: | http://www.igsoc.org/ |
Type: | article |
URI: | http://hdl.handle.net/2115/38642 |
Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: Greve Ralf
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