Determination of the Antarctic coastal line by InSAR, and variation estimate of Shirase Glacier flow by a SAR image correlation method

We applied InSAR analysis to the ERS-1/ERS-2 SAR data mostly obtained between November 1995 and March 1997, and obtained the grounding lines for parts of East Antarctica (25 ̊W-40 ̊E) and West Antarctica (85 ̊W-165 ̊W). The InSAR detected grounding lines delineated more precise (7000 m depending on location) and more detailed coastline features than the ADD coastlines. We also applied SAR image correlation method to the JERS-1 SAR data over the Shirase Glacier region to estimate seasonal and spatial variations of the ice flow velocities. From the grounding line towards 30 km downstream into Lützow-Holm Bay, seasonal and annual variations of the ice flow velocities were detected. It is significant that the western streamline has systematically larger ice flow velocity than the eastern streamline, and therefore Shirase Glacier deflects toward east by 38 ̊. This may partly be related with 50 m (10 %) ystematic deepening of bedrock topography in the eastern side, and inflow of tributary ice streams from west. s