HR: 12:05h
AN: G42A-08    [Abstracts]
TI: Sulzberger Ice Shelf Tidal Signal Reconstruction Using InSAR
AU: * baek, s
EM: baek.19@osu.edu
AF: Laboratory for Space Geodesy and Remote Sensing, The Ohio State University, 125 S. Oval Mall, columbus, oh 43210 United States
AU: Shum, c
EM: ckshum@osu.edu
AF: Laboratory for Space Geodesy and Remote Sensing, The Ohio State University, 125 S. Oval Mall, columbus, oh 43210 United States
AU: Yi, Y
G42A-08 AF: Laboratory for Space Geodesy and Remote Sensing, The Ohio State University, 125 S. Oval Mall, columbus, oh 43210 United States
AU: Kwoun, O
G42A-08 AF: SAIC / USGS National Center, EROS, Sioux Falls, SD 57198 United States
AU: Lu, Z
G42A-08 AF: SAIC / USGS National Center, EROS, Sioux Falls, SD 57198 United States
AU: Braun, A
G42A-08 AF: The Department of Geomatics Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alb T2N 1N4 Canada
AB: Synthetic Aperture Radar Interferometry (InSAR) and Differential InSAR (DInSAR) have been demonstrated as useful techniques to detect surface deformation over ice sheet and ice shelves over Antarctica. In this study, we use multiple-pass InSAR from the ERS-1 and ERS-2 data to detect ocean tidal deformation with an attempt towards modeling of tides underneath an ice shelf. High resolution Digital Elevation Model (DEM) from repeat-pass interferometry and ICESat profiles as ground control points is used for topographic correction over the study region in Sulzberger Ice Shelf, West Antarctica. Tidal differences measured by InSAR are obtained by the phase difference between a point on the grounded ice and a point on ice shelf. Comparison with global or regional tide models (including NAO, TPXO, GOT, and CATS) of a selected point shows that the tidal amplitude is consistent with the values predicted from tide models to within 4 cm RMS. Even though the lack of data hinders the effort to readily develop a tide model using longer term data (time series span over years), we suggest a method to reconstruction selected tidal constituents using both vertical deformation from InSAR and the knowledge on aliased tidal frequencies from ERS satellites. Finally, we report the comparison results of tidal deformation observed by InSAR and ICESat altimetry.
DE: 0728 Ice shelves
DE: 1243 Space geodetic surveys
DE: 5464 Remote sensing
DE: 5754 Polar regions
DE: 6924 Interferometry (1207, 1209, 1242)
SC: Geodesy [G]
MN: Fall Meeting 2005