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The morphology and dynamics of the lower Lambert Glacier and Amery Ice Shelf system

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Krebs, KA (1997) The morphology and dynamics of the lower Lambert Glacier and Amery Ice Shelf system. Research Master thesis, University of Tasmania.

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Abstract

The Lambert Glacier and Amery Ice Shelf system is one of the major east Antarctic
drainage basins and is the subject of long term and on-going investigation as part of
the Australian Antarctic program. In the region of the grounding zone between the
glacier stream and the floating ice shelf, snow which accumulated over tens of
thousands of square kilometres of the interior ice sheet is funnelled through a relatively
narrow area. The way in which the ice in this region flows is influenced by subglacial
topography, ice thickness, internal ice flow properties and the nature of the source
area of the ice.
The primary aim of this study is to use all available data to describe the morphology
and dynamic regime of the lower Lambert Glacier and Amery Ice Shelf, and to provide
the best estimate of the present mass balance and spatial distribution of the grounding
zone. The available data include radio echo soundings of ice thickness, surface
elevation data, ice velocity and surface mass balance measurements from Australian
field projects in 1968-1970 and in 1988-1990, satellite imagery, derived products from
satellite altimetry and Russian geophysical surveys.
The main region being studied is located between 70° to 72°S and 68° to 72°E. Within
this area, five transecting profiles have identified the Lambert Glacier ice stream from
both eastern and western plateau ice that also flows into the Lambert graben before
entering Prydz Bay via the Amery Ice Shelf. Two of these profiles are situated north of
T4 at 71 ° 13'S 69°28'E (Budd etal., 1992), the remaining three are south of T4. The
Lambert Glacier ice stream broadens from an average width of 34km to 421cm in the
area between the profiles south of T4 and the profiles north of T4. Two longitudinal
profiles incorporating the eastern and western edges of the drainage system have
added to the conclusion that previously determined grounding zone parameters for the
Lambert Glacier need to be redefined. The grounding zone is estimated to cover a
distance of 220km from an area near T4 (71°39'S) to the Lambert Glacier hinge line
near 73°19'S. Total mass flux through the lower Lambert Glacier averages 9.6Gt in
the grounding zone and increases marginally to 9.8Gt on the Amery Ice Shelf
proper. These figures are comparable with the earlier calculations of Budd et al.
(1982).

Item Type: Thesis (Research Master)
Keywords: Glaciers, Ice sheets
Copyright Holders: The Author
Copyright Information:

Copyright 1997 the author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Sc.)--University of Tasmania, 1998. Includes bibliographical references

Date Deposited: 19 Dec 2014 02:38
Last Modified: 05 Jul 2017 04:33
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