Browse by author
Lookup NU author(s): Professor Matt King
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
[1] New evidence is presented which shows that the Amery Ice Shelf, East Antarctica, extends similar to 240 km upstream of the previously reported position. We combine a digital elevation model of the Amery Ice Shelf created from ERS-1 satellite radar altimetry with measured ice thicknesses and a simple density model in a hydrostatic (buoyancy) calculation to map the extent of the floating ice. This reveals that the ice is floating as far south as 73.2degreesS. The result is confirmed by static GPS measurements collected during three consecutive field campaigns on the Amery Ice Shelf where the vertical component of the GPS shows a clear tidal signal at 72.98degreesS. Other evidence for the grounding zone position comes from an analysis of satellite imagery, mass flux calculations, and ice radar data. The southward extension of the grounding line substantially alters the shape and dimensions of the ocean cavity beneath the ice shelf, which has implications for modeling studies of sub-ice shelf processes, such as basal melting and freezing, ocean circulation, and tides. The new grounding line position will also improve geophysical studies, where the computation of ocean tidal loading corrections is important for postglacial rebound estimates and correction of satellite altimetry measurements within the region.
Author(s): Fricker HA, Allison I, Craven M, Hyland G, Ruddell A, Young N, Coleman R, King MA, Krebs K, Popov S
Publication type: Article
Publication status: Published
Journal: Journal of Geophysical Research
Year: 2002
Volume: 107
Issue: 5
Pages: 2092
ISSN (print): 0148-0227
Publisher: American Geophysical Union
URL: http://dx.doi.org/10.1029/2001JB000383
DOI: 10.1029/2001JB000383
Notes: grounding zone paper
Altmetrics provided by Altmetric
