Ice velocity determined using conventional and multiple-aperture InSAR

被引：87

作者：

Gourmelen, N. ^{[1
]}

Kim, S. W. ^{[2
]}

Shepherd, A. ^{[1
]}

Park, J. W. ^{[1
,3
]}

Sundal, A. V. ^{[1
]}

Bjornsson, H. ^{[4
]}

Palsson, F. ^{[4
]}

机构：

[1] Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England

[2] Sejong Univ, Dept Geoinformat Engn, Seoul, South Korea

[3] Yonsei Univ, Seoul 120749, South Korea

[4] Univ Iceland, Inst Earth Sci, Reykjavik, Iceland

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2011年 / 307卷 / 1-2期

基金：

新加坡国家研究基金会; 英国自然环境研究理事会;

关键词：

ice velocity; InSAR; Multiple Aperture InSAR; Iceland; surge; GLACIER; ICELAND;

D O I：

10.1016/j.epsl.2011.04.026

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We combine conventional Interferometric Synthetic Aperture Radar (InSAR) and Multiple Aperture InSAR (MAI) to determine the ice surface velocity on the Langjokull and Hofsjokull ice caps in Iceland in 1994. This approach allows the velocity of the 20 principal ice cap outlet glaciers to be fully resolved. We show that MAI leads to displacement estimates of finer resolution (15 versus 150 m) and superior precision (5 versus 15 cm) to those afforded by the alternative technique of speckle tracking. Using SAR data acquired in ascending and descending orbits, we show that ice flows within 15 degrees of the direction of maximum surface slope across 66% of the ice caps. It is therefore possible to determine ice displacement over the majority of the ice caps using a single SAR image pair, thereby reducing errors associated with temporal fluctuations in ice flow. (c) 2011 Elsevier B.V. All rights reserved.

引用

页码：156 / 160

页数：5

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