Influence of geometrical boundary conditions on the estimation of rheological parameters

Testut, Laurent; Tabacco, I.; Bianchi, C.; Rémy, Frédérique

doi:10.3189/172756400781820877

Cited by 10 publications

(12 citation statements)

References 17 publications

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“…By taking into account the ice temperature, one can show that rheological parameters depend on the velocity range so that the ice is a fluid with a non linear viscosity [89]. Finally, Testut et al [90] showed that too many parameters were affecting the flow (sliding, anisotropy, longitudinal stress), so that further studies, based on topography alone, would be unsuccessful for retrieving ice sheet rheological parameters. Recent studies now use the topography to constrain model and, for instance, to improve ice core dating [91,92].…”

Section: Balance Velocity and Ice Dynamicsmentioning

confidence: 99%

Antarctic Ice Sheet and Radar Altimetry: A Review

Rémy

Parouty

2009

Remote Sensing

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Abstract:Altimetry is probably one of the most powerful tools for ice sheet observation. Our vision of the Antarctic ice sheet has been deeply transformed since the launch of the ERS1 satellite in 1991. With the launch of ERS2 and Envisat, the series of altimetric observations now provides 19 years of continuous and homogeneous observations that allow monitoring of the shape and volume of ice sheets. The topography deduced from altimetry is one of the relevant parameters revealing the processes acting on ice sheet. Moreover, altimeter also provides other parameters such as backscatter and waveform shape that give information on the surface roughness or snow pack characteristics.

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Section: Balance Velocity and Ice Dynamicsmentioning

confidence: 99%

Antarctic Ice Sheet and Radar Altimetry: A Review

Rémy

Parouty

2009

Remote Sensing

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“…These connections between lakes should be taken into account when modelling flow in this sector. Indeed, Testut and others (2000) observed a major anomaly in the ice flow just above the Adventure Subglacial Trench, between Dome C and Terra Nova Bay, where Siegert and Ridley (1998b) suspected the presence of a hydrological system. The estimated basal temperature was at the melting point.…”

Section: Evidence Of Hydrological Networkmentioning

confidence: 99%

“…Moreover, it is interesting to see if there is a relation between lakes and these subglacial features and if hydrological systems can be detected. Indeed, Siegert and Ridley (1998b) and Testut and others (2000) already suspected the existence of such a system above the Adventure Subglacial Trench.…”

Section: Introductionmentioning

confidence: 99%

Lakes and subglacial hydrological networks around Dome C, East Antarctica

Rémy¹,

Testut²,

Legrésy³

et al. 2003

Ann. Glaciol.

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Precise topography from European Remote-sensing Satellite radar altimetry and high density of airborne radio-echo sounding in the area surrounding Dome C, Antarctica, show a link between surface features and subglacial lakes. In this paper, we extend the study to fine structures by computing a curvature-based coefficient (cy) related to surface undulations. These coefficient variations reveal many surface undulations, and some elongated features of this parameter seem to link known subglacial lakes. A population of high values of this coefficient, assumed to correspond to transitions between sliding and non-sliding flow regime, strengthen the appearance of a network which would link most of the lakes in the area. The existence of such a network impacts on ice-flow dynamics and on subglacial-lake studies.

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“…The ice sheet surface represents a dynamic equilibrium surface resulting from the physical, dynamic, kinematic, and climatological processes acting on it, including its fl ow over the bedrock (Paterson, 1994). It therefore con-tains the signature of the main exogenous and endogenous processes, active or recent, from the regional to the local scale (Testut et al, 2000;Rémy et al, 2001;Frezzotti et al, 2002). Estimated ice velocities in the EAIS range from ~1 m/yr in the domal and/or ice divide regions to several tens of meters per year at its margin (Rignot et al, 2011).…”

Section: Introductionmentioning

confidence: 96%

Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics

Cianfarra

Salvini

2014

Geosphere

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A recent focus of major international\ud exploration in East Antarctica has been\ud aimed at revealing its bedrock topography\ud and imaging its tectonic architecture and evolution.\ud Here we present the tectonic interpretation\ud of regional-scale lineaments revealed\ud by the Radarsat mosaic of Antarctica on\ud the ice sheet surface in the Vostok–Dome C–\ud Adventure Basin region. These lineaments\ud appear in the radar backscatter textures as\ud alignments of marked tonal variations with\ud lengths of tens to hundreds of kilometers and\ud were identifi ed using an automated methodology.\ud We explore the origin scenarios for the\ud ice sheet surface lineaments by comparing\ud their azimuthal trends and spatial distribution\ud with the main morphotectonic features\ud of the bedrock. Azimuthal analysis reveals\ud that lineaments cluster around two preferential\ud directions interpreted as structural or\ud tectonic domains. These show strong correlations\ud with azimuths of tectonic fabrics in the\ud bedrock. The main lineament domain parallels\ud the morphotectonic features of the study\ud area, namely the Adventure Basin and the\ud Concordia and Aurora Trenches. The second\ud lineament set corresponds to the mean\ud orientation of the Lake Vostok depression.\ud The spatial analyses of the two lineament\ud domains strengthen our fi ndings and interpretations.\ud Comparisons with wind and ice\ud fl ow directions exclude their infl uence on the\ud identifi ed lineament pattern. Results reveal\ud the tectonic origin of the lineament domains,\ud and demonstrate the method’s usefulness as\ud a tool for tectonic studies of regions characterized\ud by thick covers. These regions include\ud other areas of the East Antarctic craton such\ud as the Gamburtsev Subglacial Mountains, as\ud well as deserts or surfaces of other planets

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Influence of geometrical boundary conditions on the estimation of rheological parameters

Cited by 10 publications

References 17 publications

Antarctic Ice Sheet and Radar Altimetry: A Review

Antarctic Ice Sheet and Radar Altimetry: A Review

Lakes and subglacial hydrological networks around Dome C, East Antarctica

Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics

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