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TitleRADARSAT Interferometry for Antarctic Grounding-Zone Mapping
DownloadDownloads (Preprint)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorGray, A L; Short, NORCID logo; Bindschadler, R; Joughin, I; Padman, L; Vornberger, P; Khananian, A
SourceAnnals of Glaciology; 34, 2002 p. 269-276, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20043021
Mediapaper; on-line; digital
File formatpdf
Released2002 01 01
AbstractSatellite radar interferometry (SRI) is used to provide new information on grounding zones in areas of the eastern Ross Ice Shelf and the Filchner Ice Shelf. At the times of the RADARSAT SRI passes, separated by 24 days, a tidal model predicts a change in vertical displacement of the freely floating ice of greater than 1 m in both areas. The change in vertical position occurs over a 5 - 10 km flexure zone adjacent to the grounding line and would lead to a relatively high interferometric phase fringe rate. This was observed in some areas and suitable imagery have been used to map the grounding zone position to an estimated accuracy of 1-2 km. Results for the 'ice plain' area upstream of the Crary Ice Rise are consistent with the tidal model and improve the previous grounding line estimates based on field surveys and SPOT data. The results support the suggestion of increased ice grounding in this area, and show that a sub-ice shelf water channel around the southern end of the Crary Ice Rise is unlikely. Results for the Filchner Ice Shelf also show that existing maps of the grounding zone can be refined. In particular, we identify a large ice rise close to the mouth of the Bailey Ice Stream.

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