Application of a continuum-mechanical model for the flow of anisotropic polar ice to the EDML core, Antarctica
| العنوان: | Application of a continuum-mechanical model for the flow of anisotropic polar ice to the EDML core, Antarctica |
|---|---|
| المؤلفون: | Luca Placidi, Ilka Hamann, Ralf Greve, Olivier Gagliardini, Hakime Seddik |
| المصدر: | EPIC3Journal of Glaciology, 54(187), pp. 631-642 Scopus-Elsevier |
| بيانات النشر: | International Glaciological Society, 2008. |
| سنة النشر: | 2008 |
| مصطلحات موضوعية: | Fabric evolution, 010506 paleontology, 010504 meteorology & atmospheric sciences, Continuum (measurement), Meteorology, Ice stream, Geometry, 01 natural sciences, Physics::Geophysics, EDML core, Flow law, Flow velocity, Ice core, Transverse isotropy, Anisotropy, Antarctica, Polar, Data flow model, Geology, 0105 earth and related environmental sciences, Earth-Surface Processes |
| الوصف: | 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 ∼2100 m depth. Systematic deviations at greater depths are attributed to the disregard of migration recrystallization in the model. |
| وصف الملف: | application/pdf |
| تدمد: | 1727-5652 0022-1430 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e6872d0494dcb75bad27662df6fcf9a https://doi.org/10.3189/002214308786570755 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....0e6872d0494dcb75bad27662df6fcf9a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17275652 00221430 |
|---|