Vibrations of Mertz Glacier ice tongue, East Antarctica

Lydie Lescarmontier (1) , Benoît Legrésy (1) , R. Coleman , Felix Perosanz (2) , Clément Mayet (3) , Laurent Testut (4)

1 GLACIO LEGOS
2 GET - Géosciences Environnement Toulouse
3 ECOLA - Echanges Côte-Large
4 OLVAC - Océan du Large et Variabilité Climatique

At the time of its calving in February 2010, Mertz Glacier, East Antarctica, was characterized by a 145 km long, 35 km wide floating tongue. In this paper, we use GPS data from the Collaborative Research into Antarctic Calving and Iceberg Evolution (CRAC-ICE) 2007/08 and 2009/10 field seasons to investigate the dynamics of Mertz Glacier. Two months of data were collected at the end of the 2007/08 field season from two kinematic GPS stations situated on each side of the main rift of the glacier tongue and from rock stations located around the ice tongue during 2008/09. Using Precise Point Positioning with integer ambiguity fixing, we observe that the two GPS stations recorded vibrations of the ice tongue with several dominant periods. We compare these results with a simple elastic model of the ice tongue and find that the natural vibration frequencies are similar to those observed. This information provides a better understanding of their possible effects on rift propagation and hence on the glacier calving processes

Domaines: Océan, Atmosphère

Lydie Lescarmontier, Benoît Legrésy, R. Coleman, Felix Perosanz, Clément Mayet, et al.. Vibrations of Mertz Glacier ice tongue, East Antarctica. Journal of Glaciology, 2012, 58 (210), pp.665-676. ⟨10.3189/2012JoG11J089⟩. ⟨hal-00798727⟩