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

Polar research

Guy Wöppelmann¹  Erik R. Ivins²  Pascal Willis³  Laurent Testut⁴  Martine Amalvict⁵  Marie-Noëlle Bouin⁶  Jacques Hinderer⁷ 

[1] Institut de Physique du Globe de Paris, Géophysique Spatiale et Planétaire, 35 rue Hélène Brion, 75013 Paris, FranceCorrespondence;Centre Littoral de Géophysique, Université de La Rochelle, Avenue Michel Crépeau, 17042 La Rochelle Cedex 1, France;Institut Géographique National, Direction Technique, 2 Avenue Pasteur, BP 68, 94160 Saint-Mandé, France;Institut Géographique National, LAREG, 6 et 8 Avenue Blaise Pascal, 77455 Marne-la-Vallée Cedex, France;Institut de Physique du Globe de Strasbourg (UMR 7516 CNRS-ULP), 5 Rue René Descartes, 67000 Strasbourg, France;Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;LEGOS-UMR5566-CNRS/CNES/UPS/IRD-14 Avenue Edouard Belin, 31400 Toulouse, France

关键词: Absolute gravity;    Antarctica;    DORIS;    Dumont d’Urville;    GPS;    tide gauge.;   

DOI  :  10.1111/j.1751-8369.2008.00091.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

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.

【 授权许可】

CC BY-NC