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| Titel |
Two independent methods for mapping the grounding line of an outlet glacier – an example from the Astrolabe Glacier, Terre Adélie, Antarctica |
| VerfasserIn |
E. Le Meur, M. Sacchettini, S. Garambois, E. Berthier, A. S. Drouet, G. Durand, D. Young, J. S. Greenbaum, J. W. Holt, D. D. Blankenship, E. Rignot, J. Mouginot, Y. Gim, D. Kirchner, B. de Fleurian, O. Gagliardini, F. Gillet-Chaulet |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2014-07-24), S.1331-1346 |
| Datensatznummer |
250116251
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| Publikation (Nr.) |
 copernicus.org/tc-8-1331-2014.pdf |
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| Zusammenfassung |
| The grounding line is a key element of coastal outlet glaciers, acting on
their dynamics. Accurately knowing its position is fundamental for both
modelling the glacier dynamics and establishing a benchmark for later change
detection. Here we map the grounding line of the Astrolabe Glacier in East
Antarctica (66°41' S, 140°05' E), using both hydrostatic
and tidal methods. The first method is based on new surface and ice thickness
data from which the line of buoyant floatation is found. The second method
uses kinematic GPS measurements of the tidal response of the ice surface. By
detecting the transitions where the ice starts to move vertically in response
to the tidal forcing we determine control points for the grounding line
position along GPS profiles. Employing a two-dimensional elastic plate model,
we compute the rigid short-term behaviour of the ice plate and estimate the
correction required to compare the kinematic GPS control points with the
previously determined line of floatation. These two approaches show
consistency and lead us to propose a grounding line for the Astrolabe Glacier
that significantly deviates from the lines obtained so far from satellite
imagery. |
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