Science Service System

Summary of Proposal LAN2935

TitleMulti-temporal Analysis of Arctic Glacier Movements by X-band SAR Satellite Observations
Investigator Jung, Hyung-Sup - University of Seoul, Dept. of Geoinformatics
Team Member
Senior Hong, Sang-Hoon - Korea Polar Research Institute, Division of Polar Ocean Environment
Professor Lu, Zhong - Southern Methodist University, Dept. of Earth Sciences
SummaryThe knowledge and measurement of variation of glacial movement is very important because the sea level and glacial dynamics to climate changes cannot be predicted without understanding variation of glacial movement. So glacial movement is a fundamental measurement for the study of ice dynamics.In-situ measurement has been usually used for estimating glacial movement but it is difficult to measure glacial dynamics because it is difficult to carry out in-situ movement measurements on the remote glacial area. Recently remote sensed image, especially radar satellite image have been used for the measurement of glacial movement. Interferometric Synthetic Aperture Radar (InSAR) has been shown to be a feasible method to measure glacier surface movements. However, because most satellites has a low time resolution, it has serious decorrelation and by the fact that only deformation in the line-of-sight (range) direction can be obtained. And InSAR technique can only measure 1-D deformation along the antenna’s line-of-sight direction. Much research has focused on the effects of 2-D or 3-D surface deformation. SAR offset tracking can be a solution to these problems because this technique measures deformation in line-of-sight and along-track directions using the intensity tracking even if the pairs of the SAR image has a decorrelation (Strozzi et al., 2002). However, the pixel-offset method has a weak point that is a low sensitivity. This drawback can be overcome by the multiple aperture SAR interferometric (MAI) technique. The objectives of this project are 1) to measure three-dimensional glacier movement by the integration of InSAR (Interferometric Synthetic Aperture Radar) and MAI (Multiple-Aperture InSAR) techniques and by the improved offset tracking method, and 2) to observe time-series three-dimensional glacier movement variations with X-band SAR satellite data. The study area includes 1) relatively slower glacier flow (< 300 m/year) region (Kongsvegen and Kronebreen, Svalbard) and much faster glacier flow (> 1 km/year) region (Jakobshavn Isbrae and Kangerdlugssuaq in Greenland). Our research will focus on observations of time-series glacier movement variation for more than 10 years in Arctic areas. Funding for this work will be provided by the national research foundation of Korea and the U.S. Geological Survey’s Program.

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