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Basal conditions and ice dynamics inferred from radar-derived internal stratigraphy of the northeast Greenland ice stream
- Source :
- Annals of Glaciology. 55:127-137
- Publication Year :
- 2014
- Publisher :
- International Glaciological Society, 2014.
-
Abstract
- We analyze the internal stratigraphy in radio-echo sounding data of the northeast Greenland ice stream to infer past and present ice dynamics. In the upper reaches of the ice stream, we propose that shear-margin steady-state folds in internal reflecting horizons (IRHs) form due to the influence of ice flow over spatially varying basal lubrication. IRHs are generally lower in the ice stream than outside, likely because of greater basal melting in the ice stream from enhanced geothermal flux and heat of sliding. Strain-rate modeling of IRHs deposited during the Holocene indicates no recent major changes in ice-stream vigor or extent in this region. Downstream of our survey, IRHs are disrupted as the ice flows into a prominent overdeepening. When combined with additional data from other studies, these data suggest that upstream portions of the ice stream are controlled by variations in basal lubrication whereas downstream portions are confined by basal topography.
- Subjects :
- 010506 paleontology
geography
geography.geographical_feature_category
010504 meteorology & atmospheric sciences
Ice stream
Antarctic sea ice
01 natural sciences
Arctic ice pack
Ice shelf
Fast ice
Sea ice
Ice divide
Ice sheet
Geomorphology
Geology
0105 earth and related environmental sciences
Earth-Surface Processes
Subjects
Details
- ISSN :
- 17275644 and 02603055
- Volume :
- 55
- Database :
- OpenAIRE
- Journal :
- Annals of Glaciology
- Accession number :
- edsair.doi...........c27931502d073531edd2b4bccfc63cbc