Glaciological observations of Brúarjökull, Iceland, using synthetic aperture radar and thematic mapper satellite data
| Autor: | Richard S. Williams, Oddur Sigurdsson, Dorothy K. Hall |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Synthetic aperture radar
010506 paleontology geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Glacier Geodesy 01 natural sciences Space-based radar European Remote-Sensing Satellite Thematic Mapper Interferometric synthetic aperture radar Snow line Surge Geology 0105 earth and related environmental sciences Earth-Surface Processes Remote sensing |
| Zdroj: | Annals of Glaciology. 21:271-276 |
| ISSN: | 1727-5644 0260-3055 |
| DOI: | 10.3189/s0260305500015937 |
| Popis: | The first European Remote Sensing Satellite (ERS-1) synthetic aperture radar (SAR) images offer opportunities for studying glacier surface properties and near-surface features. Analysis of back-scatter values from digital SAR data from 18 January, 7 June, 1 September and 25 October 1993 of Brúarjökull, an outlet glacier on the northeastern margin of the Vatnajökull ice cap, Iceland, that has a history of episodic surges, reveals several back-scatter boundaries that may relate to glacier facies and, inferentially, to mass balance. For example, a strong back-scatter boundary on the 18 January image of the snow-covered glacier, representing a back-scatter coefficient, σ°, difference of 4.34dB, appears to coincide with the position of the transient snow line at the end of the 1990–91 budget year. The boundary is visible on the 7 September 1991 Landsat thematic mapper (TM) image. The terminus is very difficult to define because of back-wasting from the last surge (1963–64) but is most easily delineated on the 1 September 1993 SAR and the 7 September 1991 TM images, in part due to the presence of ice-margin lakes. |
| Databáze: | OpenAIRE |
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