GEOSCAN Search Results: Fastlink


TitleVelocities and Flux of the Filchner Ice Shelf and its Tributaries Determined from Speckle Tracking Interferometry
DownloadDownloads (Preprint)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorGray, A L; Short, N; Mattar, K E; Jezek, K C
SourceCanadian Journal of Remote Sensing vol. 27, issue 3, 2001.,
Alt SeriesEarth Sciences Sector, Contribution Series 20043020
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
Subjectsremote sensing; mapping techniques; glaciers; ice movement; glacial float; ice flow; ice margins; SAR imagery; Slessor Glacier; Recovery Glacier; Foundation Ice Stream; Force Glacier
Illustrationssatellite images; tables; flow charts; diagrams
Released2014 07 28
AbstractVelocities of the Filchner Ice Shelf and its tributary glaciers are derived using a variation of satellite radar interferometry known as speckle tracking. The method requires a coherent pair of SAR passes, a digital elevation model and, for floating ice, an estimate of the height difference due to the tide. Speckle tracking interferometry has the advantage that ice speed and direction can be estimated from one interferometric pair and, with adequate coherence, it is suitable for areas of high velocity and long repeat cycles. Fluxes are estimated using the ice velocities together with ice thickness data derived from a hydrostatic equilibrium model. They are given for gates downstream from the grounding lines of the input tributary glaciers, and for a gate close to the ice shelf edge. The calculations show that the flux close to the edge of the Filchner Ice Shelf (~75.3 km3/a) is comparable to that estimated further upstream. However, the errors in the estimates (~ 10 km3/a) preclude any firm conclusions concerning equilibrium of the ice shelf, or bottom surface melt or accretion. Assuming the upstream fluxes reflect the flow across the grounding lines, then the Recovery Glacier is the largest contributor to the ice shelf with 48% and the Slessor Glacier is the second largest with 33%. Support Force Glacier and Foundation Ice Stream both contribute ~7%. Ice Shelf accumulation accounts for the remaining 5%.