Results From The Amery Ice Shelf Project

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

doi:10.3189/s0260305500002494

Cited by 56 publications

(105 citation statements)

References 11 publications

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“…Pioneering work on the Lambert‐Amery system was carried out by Australian National Antarctic Research Expeditions (ANARE) [ Budd , 1966; Morgan and Budd , 1975; Budd et al , 1982; Higham et al , 1997; Kiernan , 1998; Phillips et al , 1996]. On the basis of the data collected by the earlier expeditions, Allison [1979] and McIntyre [1985] both reported a positive mass budget, although they made widely differing balance estimates.…”

Section: Introductionmentioning

confidence: 99%

Analysis of velocity field, mass balance, and basal melt of the Lambert Glacier–Amery Ice Shelf system by incorporating Radarsat SAR interferometry and ICESat laser altimetry measurements

Yu¹,

Liu²,

Jezek³

et al. 2010

J. Geophys. Res.

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[1] By incorporating recently available remote sensing data, we investigated the mass balance for all individual tributary glacial basins of the Lambert Glacier-Amery Ice Shelf system, East Antarctica. On the basis of the ice flow information derived from SAR interferometry and ICESat laser altimetry, we have determined the spatial configuration of eight tributary drainage basins of the Lambert-Amery glacial system. By combining the coherence information from SAR interferometry and the texture information from SAR and MODIS images, we have interpreted and refined the grounding line position. We calculated ice volume flux of each tributary glacial basin based on the ice velocity field derived from Radarsat three-pass interferometry together with ice thickness data interpolated from Australian and Russian airborne radio echo sounding (RES) surveys and inferred from ICESat laser altimetry data. Our analysis reveals that three tributary basins have a significant net positive imbalance, while five other subbasins are slightly positive or close to zero balance. Overall, in contrast to previous studies, we find that the grounded ice in Lambert Glacier-Amery Ice Shelf system has a positive mass imbalance of 22.9 ± 4.4 Gt a . The melting rate decreases rapidly from the grounding zone to the ice shelf front. Significant basal refreezing is detected in the downstream section of the ice shelf. The mass balance estimates for both the grounded ice sheet and the ice shelf mass differ substantially from other recent estimates.

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Section: Introductionmentioning

confidence: 99%

Analysis of velocity field, mass balance, and basal melt of the Lambert Glacier–Amery Ice Shelf system by incorporating Radarsat SAR interferometry and ICESat laser altimetry measurements

Yu¹,

Liu²,

Jezek³

et al. 2010

J. Geophys. Res.

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show abstract

“…In addition, the topography changes here from rougher areas indicative of grounded ice to smoother areas indicative of¯oating ice. This coincides with the location of the grounding line as mentioned in the literature (Mellor and McKinnon 1960, Budd et al 1982, Zwally et al 1987, Partington et al 1987, cf. Herzfeld et al 1993.…”

Section: Application: Mapping Lambert Glacier/ Amery Ice Shelf From 1mentioning

confidence: 60%

Geostatistical interpolation and classification of remote sensing data from ice surfaces

Herzfeld¹

1999

International Journal of Remote Sensing

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Geostatistical methods for interpolation and extrapolation of irregularly spaced data are kriging methods, a family of methods based on the least-squares optimization principle and usually introduced in a probabilistic framework (`geostatistical estimation'). The di erence between kriging and numerical interpolation methods lies in the exploitation of a spatial structure function, the variogram, in the optimization. Usefulness of geostatistical interpolation for glaciological data analysis has been demonstrated a number of times. Application of ordinary kriging to satellite radar altimeter data from Antarctic ice streams yields maps of 3-km resolution that facilitate glaciodynamic investigations. The technique is exempli® ed here for 1995 ERS-1 data, and the resultant new map of the entire Lambert Glacier/Amery Ice Shelf area including upper Lambert Glacier and other tributaries of (lower) Lambert Glacier (59ß ± 79ß E/68ß ± 75ß S) is presented.While interpolation utilizes the primary information in the data, a geostatistical surface classi® cation method is developed to derive secondary information from elevation and backscatter data. Based on quantitative properties of the variogram, elements of surface structures are used for mapping and segmentation of an area into provinces homogeneous in surface characteristics. A critical issue in the analysis of satellite Synthetic Aperture Radar (SAR) data is the availability of ground truthing to distinguish between intensity variations caused by subscaleresolution geophysical variability and noise, and to determine small-scale sources of variations in backscattering. During the 1993± 1995 surge of Bering Glacier, Alaska, GPS-located video data were collected from small aircraft and analyzed systematically with the geostatistical ice surface classi® cation system ICECLASS. The objectives are to (a) help understand the relations between ice velocities, surface strain states, and progression of deformation processes during the surge, and (b) provide a technique for surface classi® cation based on video data, SAR data, or image data in general.

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“…The AIS is the floating extension of the Lambert Glacier, extending over 500km in a north-south direction, and 50 to 100km in width. Horizontal velocities vary between one to several meters per day along the length of the ice shelf, generally increasing toward the ice shelf front [5] . Ice thicknesses vary from a few thousand meters at the grounding zone to a thickness of only a few hundred meters at the ice shelf front.…”

Section: Introductionmentioning

confidence: 99%

Ice velocities on the front of Amery Ice Shelf, East Antarctica, from static GPS observations

2006

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The Lambert Glacier-Amery Ice Shelf (LAS) system is the largest glacier-ice-shelf system in East Antarctica, the Amery Ice Shelf (AIS) and its tributaries drain ice from the LAS system. During the austral summer season of 2002/03, the 19th Chinese National Antarctica Research Expedition (CHINARE) carried out the first expedition on the Amery Ice Shelf and set up 7 GPS sites, During the austral summer season of 2003/04, the 20th Chinese National Antarctica Research Expedition (CHINARE) cooperated with Australian National Antarctica Research Expedition (ANARE) visited the Amery Ice Shelf again, 5 GPS sites were reoccupied. The GPS data were processed using the GAMIT/GLOBK software, and the surface ice velocities was calculated. Results show that surface horizontal velocities at the 5 GPS sites at the front of the Amery Ice Shelf vary between 900m/y and 1600m/y. Such studies are fundamental to improving our knowledge of the Antarctic ice sheet mass balance and dynamical models of ice/ocean interaction.

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Results From The Amery Ice Shelf Project

Cited by 56 publications

References 11 publications

Analysis of velocity field, mass balance, and basal melt of the Lambert Glacier–Amery Ice Shelf system by incorporating Radarsat SAR interferometry and ICESat laser altimetry measurements

Analysis of velocity field, mass balance, and basal melt of the Lambert Glacier–Amery Ice Shelf system by incorporating Radarsat SAR interferometry and ICESat laser altimetry measurements

Geostatistical interpolation and classification of remote sensing data from ice surfaces

Ice velocities on the front of Amery Ice Shelf, East Antarctica, from static GPS observations

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