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Redefinition of the Amery Ice Shelf, East Antarctica, grounding zone


Fricker, HA and Allison, I and Craven, M and Hyland, G and Ruddell, A and Young, N and Coleman, R and King, MA and Krebs, K and Popov, S, Redefinition of the Amery Ice Shelf, East Antarctica, grounding zone, Journal of Geophysical Research B: Solid Earth, 107, (5) pp. EPM 6-1 - EPM 6-9. ISSN 0148-0227 (2002) [Refereed Article]


New evidence is presented which shows that the Amery Ice Shelf, East Antarctica, extends ∼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 73.2°S. 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 72.98°S. 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.

Item Details

Item Type:Refereed Article
Keywords:Antarctica; Glaciology; Grounding zone; Ice shelf; Radar altimetry; Radio-echo sounding; digital elevation model; glaciology; GPS; ice shelf; remote sensing; satellite altimetry; Antarctica
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Physical geography and environmental geoscience not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:King, MA (Professor Matt King)
ID Code:81796
Year Published:2002
Deposited By:Geography and Environmental Studies
Deposited On:2013-01-08
Last Modified:2013-01-08

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