Tidal Modulation of a Lateral Shear Margin: Priestley Glacier, Antarctica

Flow dynamics of Byrd Glacier, East Antarctica

Force-balance calculations on Byrd Glacier, East Antarctica, reveal large spatial variations in the along-flow component of driving stress with corresponding sticky spots that are stationary over time. On the large scale, flow resistance is partitioned between basal (�80%) and lateral (�20%) drag. Ice flow is due mostly to basal sliding and concentrated vertical shear in the basal ice layers, i...

Surface "Waves" on Byrd Glacier, Antarctica

Byrd Glacier has one of the largest ice catchment areas in Antarctica, delivers more ice to the Ross Ice Shelf than any other ice stream, and is the fastest of these ice streams. A force balance, combined with a mass balance, demonstrates that stream flow in Byrd Glacier is transitional from sheet flow in East Antarctica to shelf flow in the Ross Ice Shelf. The longitudinal pulling stress, calc...

Tidal Flexure of Jakobshavns Glacier, West Greenland

Terrasar-x Interferometric Observations of the Recovery Glacier System, Antarctica

Two methods for derivation of surface ice velocity from SAR data are presented. They are applied to the RAMP Glacier in East Antarctica, which was imaged in repeat pass by TerraSAR-X in 2008 as part of the International Polar Year (IPY). Coregistration methods and an algorithm to improve the interferometric phase quality are described. The accuracy of speckle tracking and interferometric phasee...

Bed conditions of Pine Island Glacier, West Antarctica

Although 90% of Antarctica‟s discharge occurs via its fast-flowing ice streams, our ability to project future ice-sheet response has been limited by poor observational constraints on the ice-bed conditions used in numerical models to determine basal slip. We have helped address this observational deficit by acquiring and analysing a series of seismic reflection profiles to determine basal condi...