Results From The Amery Ice Shelf Project

Budd, W. F.; Corry, M. J.; Jacka, T. H.

doi:10.1017/s0260305500002494

Cited by 86 publications

(101 citation statements)

References 7 publications

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“…(3) The area of the AIS is approximately 71,260 km 2 (Fricker et al 2002a). (4) The thickness of the ice shelf varies from 2500 m at the grounding zone to 200 m at the front (Budd et al 1982, Fricker et al 2002a) with some areas of sea-ice accretion and some areas of melt at the ice/ocean interface (Fricker et al 2001). (5) Ice velocities range from 300 m/yr to 1350 m/yr (Young & Hyland 2002).…”

Section: Summary Of Major Results From Spatial Data Collected On the mentioning

confidence: 99%

“…However, owing to adverse weather conditions throughout autumn and winter, this could not be achieved. The Amery Ice Shelf Project was therefore extended into the following 1969/70 summer season, when the network was remeasured using tellurometer and theodolite and the levelling route extended southwards for another 30-50 km (Budd et al 1982, Corry 1987. According to the log book of the trip, the levelling run had to be terminated after only 17 km (based on sledge-wheel readings) owing to the deteriorating eroded surface caused by melt.…”

Section: -70mentioning

confidence: 99%

“…During this survey, observations were again made between the same traverse and rock sites providing a connection to the 1968/69 survey (Corry 1987). Also in this season, a newly designed ground-based radio echo sounder (RES) (see Plate 4) was used to provide ice thickness measurements along the traverse route (Budd et al 1982). The Amery Ice Shelf Project resulted in several scientific firsts as described by Corry (1987), among which were:…”

Section: -70mentioning

confidence: 99%

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Spatial Sciences on Ice: 50 years of Australian activities on the Amery Ice Shelf, East Antarctica

Hurd

2008

Australian Geographer

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Section: Summary Of Major Results From Spatial Data Collected On the mentioning

confidence: 99%

Section: -70mentioning

confidence: 99%

Section: -70mentioning

confidence: 99%

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Spatial Sciences on Ice: 50 years of Australian activities on the Amery Ice Shelf, East Antarctica

Hurd

2008

Australian Geographer

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“…However, other surface processes, such as differential ablation and spatially variable snow deposition, can sometime mask the effect of ice flow on surface geometry. On the Amery Ice Shelf in front of the Lambert Glacier, where mean annual snow accumulation is ∼1.2 ma −1 (Budd et al, 1982), for example, longitudinal surface structures are progressively masked downice by surface snow (Fig. 2a).…”

Section: Discussionmentioning

confidence: 99%

Longitudinal surface structures (flowstripes) on Antarctic glaciers

Glasser

Gudmundsson

2012

The Cryosphere

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Abstract. Longitudinal surface structures ("flowstripes") are common on many glaciers but their origin and significance are poorly understood. In this paper we present observations of the development of these longitudinal structures from four different Antarctic glacier systems; the Lambert Glacier/Amery Ice Shelf area, the Taylor and Ferrar Glaciers in the Ross Sea sector, Crane and Jorum Glaciers (ice-shelf tributary glaciers) on the Antarctic Peninsula, and the onset zone of a tributary to the Recovery Glacier Ice Stream in the Filchner Ice Shelf area. Mapping from optical satellite images demonstrates that longitudinal surface structures develop in two main situations: (1) as relatively wide flow stripes within glacier flow units and (2) as relatively narrow flow stripes where there is convergent flow around nunataks or at glacier confluence zones. Our observations indicate that the confluence features are narrower, sharper, and more clearly defined features. They are characterised by linear troughs or depressions on the ice surface and are much more common than the former type. Longitudinal surface structures within glacier flow units have previously been explained as the surface expression of localised bed perturbations but a universal explanation for those forming at glacier confluences is lacking. Here we propose that these features are formed at zones of ice acceleration and extensional flow at glacier confluences. We provide a schematic model for the development of longitudinal surface structures based on extensional flow that can explain their ridge and trough morphology as well as their down-ice persistence.

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“…In-situ measurement is a direct way to obtain the ice flow speed information. Various approaches, such as stake measurements (Budd et al, 1982) and GNSS observations (King et al, 2007;Urbini et al, 2008), were applied to derive the glacier surface motion. Yet it is not easy to accomplish the ice velocity estimation for a large area given the time and effort it would take to perform the observation.…”

Section: Introductionmentioning

confidence: 99%

A NOVEL METHOD FOR ESTIMATION OF GLACIER SURFACE MOTION IN 1960s FROM ARGON KH-5 OPTICAL IMAGERY

Li¹,

Ye²,

Kong³

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The Antarctic ice sheet response to the global climate change, specifically the ice flow speed change of the glaciers, has been investigated by many researchers. However, most research results cover the period since 1970s or after the operation of the LANDSAT series. The availability of the film-based ARGON KH-5 data makes it possible to quantify the changes of the Antarctic ice sheet in 1960s. To meet the challenges of processing the low quality film-based ARGON images, a novel method was developed to allow estimating the ice sheet surface motion and reconstructing the surface model simultaneously from ARGON stereo images by decomposing the total parallaxes to terrain and motion based components. A photogrammetric approach was developed to distinguish stable ice surface features from those on motion and use them for recovering the camera orientation information. Several existing Antarctic mapping products were used to establish the ground control. The ice flow speed field is reconstructed using a hierarchical image matching strategy. Firstly, epipolar images are generated via a fundamental matrix derived from correspondences used in the geometric modelling process, and then an image pyramid is built. Second, the normalized cross-correlation (NCC) technique is conducted on each layer of the pyramid to match the extracted features. Since the images were taken at different times, during which the glacier motion occurred, the measured total parallaxes are decomposed to terrain and motion parallaxes according to given ice flow directions which are derived from the iteratively produced DTM or images. Finally, a speed map and a DTM can be generated at each level of the image pyramid. This process repeats itself. At the bottom of the pyramid the final speed map and DTM are produced at a resolution of about 60m and represent the ice flow field of 1963. This approach was tested using two ARGON stereo-pairs in Rayner glacier in East Antarctica. Both the ice flow speed map and DTM were generated, and their difference with recent products is briefly discussed.

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Results From The Amery Ice Shelf Project

Cited by 86 publications

References 7 publications

Spatial Sciences on Ice: 50 years of Australian activities on the Amery Ice Shelf, East Antarctica

Spatial Sciences on Ice: 50 years of Australian activities on the Amery Ice Shelf, East Antarctica

Longitudinal surface structures (flowstripes) on Antarctic glaciers

A NOVEL METHOD FOR ESTIMATION OF GLACIER SURFACE MOTION IN 1960s FROM ARGON KH-5 OPTICAL IMAGERY

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