Ice flow physical processes derived from the ERS-1 high-resolution map of the Antarctica and Greenland ice sheets

Details Ice flow physical processes derived from the ERS-1 high-resolution map of the Antarctica and Greenland ice sheets Ice flow physical processes derived from the ERS-1 high-resolution map of the Antarctica and Greenland ice sheets

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.139..645r&link_type=abstract

Geophysical Journal International, Volume 139, Issue 3, pp. 645-656.

Astronomy and Astrophysics

Astronomy

25

Rheology, Satellite Geodesy, Topography

Scientific paper

The ERS-1 satellite, launched in 1991, has provided altimetric observations of the Greenland Ice Sheet and 80 per cent of the Antarctica Ice Sheet north of 82 degS. It was placed in a geodetic (168-day repeat) orbit between April 1994 and March 1995, yielding a 1.5 km across-track spacing at latitude 70 deg with a higher along-track sampling of 350 m. We have analysed the waveform altimetric data from this period to compute maps with a 1/30 deg grid size. Data processing consists of correcting for environmental factors and editing and retracking the waveforms. A further step consists of reducing the radial orbit error through crossover analysis and correcting the slope error to second order. The high-resolution topography of both ice sheets reveals numerous details. A kilometre-scale surface roughness running at 45 deg from the flow direction is the dominant topographic characteristic of both continents. Antarctica also exhibits many scars due to local flow anomalies. Several physical processes can be identified: abrupt transitions from deformation to sliding and vice versa, and impressive strike-slip phenomena, inducing en echelon folds.

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