Identification of subglacial lakes using ERS-1 radar altimeter
| Autor: | Seymour W. Laxon, J. K. Ridley, W. Cudlip |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
geography
010506 paleontology geography.geographical_feature_category 010504 meteorology & atmospheric sciences Elevation 01 natural sciences law.invention Smooth surface Depth sounding law Radar altimeter Lake Vostok Subglacial lake Ice sheet Radar Geomorphology Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of Glaciology. 39:625-634 |
| ISSN: | 1727-5652 0022-1430 |
| DOI: | 10.3189/s002214300001652x |
| Popis: | Radar-altimeter data from ERS-1 allow detailed topographic mapping of Antarctica to 82° S to be carried out, revealing several notable surface features. Among these is the large subglacial lake near Vostok which is mapped here in detail. The central part of the lake is found to have an exceptionally smooth surface with r.m.s. elevation variations of less than 0.2 m. A search for other large Antarctic lakes in the data is made based on the smoothness and low gradient of the surface. A number of other flat areas are identified with lake locations previously determined from radio-echo sounding observations. However, radar-altimeter observations show that a minimum lake size of 20 km is required for a surface above a lake to become flat. Numerous bowl-like features can be seen in the surface topography, and these may be associated with intermediate-sized subglacial lakes. It is determined that high spatial-resolution radar altimetery could be used to identify subglacial lakes greater than 10 km in lateral extent. Flat regions of the ice sheet are particularly useful as they may be used as height-reference surfaces to help fix the orbits of radar-altimeter satellites. |
| Databáze: | OpenAIRE |
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