TY  - JOUR
AU  - E. Le Meur, M. Sacchettini
PY  - 2013//
TI  - Two independent methods for mapping the grounding line of an outlet glacier – example from the Astrolabe Glacier, Terre Adélie, Antarctica
T2  - The Cryosphere Discuss.
JO  - The Cryosphere Discuss.
SP  - 3969
EP  - 4014
VL  - 7
IS  - 4
N2  - AbstractThe grounding line is a key element acting on the dynamics of coastal outlet glaciers.Knowing its position accurately is fundamental for both modelling the glacier dynamicsand establishing a benchmark to which one can later refer in case of change. Here we� �map the grounding line of the Astrolabe Glacier in East Antarctica (66 41 S; 140 05 E),using hydrostatic and tidal methods. The first method is based on new surface andice thickness data from which the line of buoyant flotation is found. We compare thishydrostatic map with kinematic GPS measurements of the tidal response of the icesurface. By detecting the transitions where the ice starts to move vertically in responseto the tidal forcing we find control points for the grounding line position along GPSprofiles. With the help of a 2-dimensional elastic plate model, rigid elastic deviations arecomputed and applied to these control points. Once the extent of the grounding zone,the kinematic approach is consistent with the hydrostatic map. These two approacheslead us to propose a grounding line for the Astrolabe Glacier that significantly deviatesfrom those obtained so far from satellite imagery.
SN  - 1994-0440
UR  - http://dx.doi.org/10.5194/tcd-7-3969-2013
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=4397), last updated on Sat, 29 Jun 2024 11:56:34 +0200
ID  - E.LeMeur2013
ER  -