Wednesday, 29 August 2007 - 10:30 AM
3.A.A-2
"Determination of the Antarctic coastline by InSAR, and variation estimate of Shirase Glacier flow by a SAR image correlation method"
Kazuo Shibuya1, Koichiro Doi1, Tsutomu Yamanokuchi2, and Kazuki Nakamura3. (1) National Institute of Polar Research, Kaga 1-9-10, Itabashi-ku, Tokyo, Japan, (2) RESTEC, Roppongi 1-9-9, Minato-ku, Tokyo, Japan, (3) Remote Sensing Group, AIST, Higashi 1-1-1, Tsukuba, Ibaraki, Japan
Summary We applied InSAR analysis to the ERS-1/ERS-2 SAR data, and estimated the grounding lines for East Antarctica (25¢ªW-40¢ªE) and West Antarctica (85¢ªW-165¢ªW). The InSAR detected grounding lines delineated more precise (7000 m bias correction) 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, seasonal and annual variations of the ice flow velocities were detected. The western streamline has systematically larger ice flow velocity than the eastern streamline, and Shirase Glacier deflects toward east by a total of 38¢ª. This may partly be related with 60m systematic deepening of bedrock topography in the eastern side, and partly with inflow of small ice streams from west.