Isostatic stability of the East Antarctic station Dumont d'Urville from long-term geodetic observations and geophysical models | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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

Type de publication:

Journal Article

Source:

Polar Research, Volume 28, Ticket 2, p.193-202 (2009)

ISBN:

0800-0395

Numéro d'accès:

WOS:000268302600005

URL:

http://onlinelibrary.wiley.com/doi/10.1111/j.1751-8369.2008.00091.x/abstract;jsessionid=E82A8FA13AB442B73E00FEC7447EF676.d02t02?userIsAuthenticated=false&deniedAccessCustomisedMessage=

Mots-clés:

UMR 7154 ; Géophysique spatiale et planétaire ; N° Contribution : 2329 ; Absolute gravity; Antarctica; DORIS; Dumont d'Urville; GPS; tide gauge

Résumé:

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.