期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 307, 期 1-2, 页码 156-160出版社
ELSEVIER
DOI: 10.1016/j.epsl.2011.04.026
关键词
ice velocity; InSAR; Multiple Aperture InSAR; Iceland; surge
资金
- European Space Agency
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2010-0028025]
- UK Natural Environment Research Council Antarctic Funding Initiative [NE/E014089/1]
- Philip Leverhulme Prize
- NERC [cpom20001, NE/E014089/1, NE/E014089/2] Funding Source: UKRI
- Natural Environment Research Council [earth010006, cpom20001, NE/E014089/2, NE/E014089/1] Funding Source: researchfish
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.
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