Surface elevation contours of Greenland and Antarctic ice sheets
Preliminary results from Seasat radar altimetry over Antarctica north of 72 deg S and Greenland south of 72 deg N are presented. Surface elevations of the ice sheets, obtained from computer retracking of the radar altimeter waveforms, are contoured at 50-m intervals for Greenland and at 100-m interv...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19830043068 2023-05-15T13:35:32+02:00 Surface elevation contours of Greenland and Antarctic ice sheets Zwally, H. J. Bindschadler, R. A. Brenner, A. C. Martin, T. V. Thomas, R. H. Unclassified, Unlimited, Publicly available Feb 28, 1983 http://ntrs.nasa.gov/search.jsp?R=19830043068 unknown http://ntrs.nasa.gov/search.jsp?R=19830043068 Accession ID: 83A24286 Copyright Other Sources 46 Journal of Geophysical Research; 88; Feb. 28 1983 ftnasantrs 2012-02-15T15:27:04Z Preliminary results from Seasat radar altimetry over Antarctica north of 72 deg S and Greenland south of 72 deg N are presented. Surface elevations of the ice sheets, obtained from computer retracking of the radar altimeter waveforms, are contoured at 50-m intervals for Greenland and at 100-m intervals for Antarctica. Elevation differences at orbital crossover points are analyzed to obtain a precision of 1.9 m; this figure is partly determined by radial errors of approximately 1.0 m in orbital determination and partly by noise due to ice surface irregularities. Adjustment of the radial components of the orbits to minimize the differences in elevations at crossovers over a small, relatively flat region reduces the rms difference to 0.25 m, which is indicative of the optimum precision obtainable over the ice sheets. However, the precision degrades as the slope of the surface or amplitude of the undulations increases, yielding an overall precision of + or - 1.6 m. Other/Unknown Material Antarc* Antarctic Antarctica Greenland NASA Technical Reports Server (NTRS) Antarctic Greenland |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
unknown |
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46 |
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46 Zwally, H. J. Bindschadler, R. A. Brenner, A. C. Martin, T. V. Thomas, R. H. Surface elevation contours of Greenland and Antarctic ice sheets |
topic_facet |
46 |
description |
Preliminary results from Seasat radar altimetry over Antarctica north of 72 deg S and Greenland south of 72 deg N are presented. Surface elevations of the ice sheets, obtained from computer retracking of the radar altimeter waveforms, are contoured at 50-m intervals for Greenland and at 100-m intervals for Antarctica. Elevation differences at orbital crossover points are analyzed to obtain a precision of 1.9 m; this figure is partly determined by radial errors of approximately 1.0 m in orbital determination and partly by noise due to ice surface irregularities. Adjustment of the radial components of the orbits to minimize the differences in elevations at crossovers over a small, relatively flat region reduces the rms difference to 0.25 m, which is indicative of the optimum precision obtainable over the ice sheets. However, the precision degrades as the slope of the surface or amplitude of the undulations increases, yielding an overall precision of + or - 1.6 m. |
format |
Other/Unknown Material |
author |
Zwally, H. J. Bindschadler, R. A. Brenner, A. C. Martin, T. V. Thomas, R. H. |
author_facet |
Zwally, H. J. Bindschadler, R. A. Brenner, A. C. Martin, T. V. Thomas, R. H. |
author_sort |
Zwally, H. J. |
title |
Surface elevation contours of Greenland and Antarctic ice sheets |
title_short |
Surface elevation contours of Greenland and Antarctic ice sheets |
title_full |
Surface elevation contours of Greenland and Antarctic ice sheets |
title_fullStr |
Surface elevation contours of Greenland and Antarctic ice sheets |
title_full_unstemmed |
Surface elevation contours of Greenland and Antarctic ice sheets |
title_sort |
surface elevation contours of greenland and antarctic ice sheets |
publishDate |
1983 |
url |
http://ntrs.nasa.gov/search.jsp?R=19830043068 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland |
genre_facet |
Antarc* Antarctic Antarctica Greenland |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19830043068 Accession ID: 83A24286 |
op_rights |
Copyright |
_version_ |
1766066883468984320 |