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| Titel |
A full Stokes ice flow model for the vicinity of Dome Fuji, Antarctica, with induced anisotropy and fabric evolution |
| VerfasserIn |
H. Seddik, R. Greve, T. Zwinger, L. Placidi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 5, no. 2 ; Nr. 5, no. 2 (2011-06-06), S.495-508 |
| Datensatznummer |
250002439
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| Publikation (Nr.) |
 copernicus.org/tc-5-495-2011.pdf |
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| Zusammenfassung |
| A three-dimensional, thermo-mechanically coupled ice flow model
with induced anisotropy has been applied to a
~200 × 200 km domain around the Dome Fuji
drill site, Antarctica. The model ("Elmer/Ice") is based on
the open-source multi-physics package Elmer
(http://www.csc.fi/elmer/) and solves the full Stokes
equations. Flow-induced anisotropy in ice is accounted for by
an implementation of the
Continuum-mechanical,
Anisotropic Flow model, based on
an anisotropic Flow Enhancement
factor ("CAFFE model"). Steady-state simulations for
present-day climate conditions are conducted. The main findings
are: (i) the flow regime at Dome Fuji is a complex
superposition of vertical compression, horizontal extension and
bed-parallel shear; (ii) for an assumed geothermal heat flux of
60 mW m−2 the basal temperature at Dome Fuji
reaches the pressure melting point and the basal melting rate
is ~0.35 mm a−1; (iii) in agreement with
observational data, the fabric shows a strong single maximum at
Dome Fuji, and the age of the ice is decreased compared to an
isotropic scenario; (iv) as a consequence of spatially variable
basal melting conditions, the basal age tends to be smaller
where the ice is thicker and larger where the ice is thinner.
The latter result is of great relevance for the consideration
of a future drill site in the area. |
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