Isostatic stability of the East Antarctic station Dumont d’Urville from long-term geodetic observations and geophysical models

  • Martine Amalvict
  • Pascal Willis
  • Guy Wöppelmann
  • Erik R. Ivins
  • Marie-Noëlle Bouin
  • Laurent Testut
  • Jacques Hinderer

Abstract

Geodetic measurements of the vertical crustal displacement collocated with absolute gravity changes provide a discriminatory measurement of present-day glacial changes, versus more deeply seated rock motions caused by glacial isostatic adjustment (GIA). At the East Antarctic station of Dumont d’Urville, we compare the displacements derived from continuous DORIS (1993.0– 2006.0) and Global Positioning System (GPS) (1999.0–2005.7) data, and observed changes in absolute gravity (2000–2006), with the predicted vertical displacement and change in gravity from GIA modelling. The geodetic results have mutual self-consistency, suggest station stability and provide upper bounds on both GIA and secular ice mass changes. The GIA models tend to predict amplitudes of rock motion larger than those observed, and we conclude that this part of Antarctica is probably experiencing a slight gain in ice mass, in contrast to West Antarctica.

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Published
2009-08-01
How to Cite
Amalvict, M., Willis, P., Wöppelmann, G., Ivins, E., Bouin, M.-N., Testut, L., & Hinderer, J. (2009). Isostatic stability of the East Antarctic station Dumont d’Urville from long-term geodetic observations and geophysical models. Polar Research, 28(2), 193-202. https://doi.org/10.3402/polar.v28i2.6112
Section
Research/review articles