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  • 1
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    Balance Velocities of the Greenland Ice Sheet (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: We present a map of balance velocities for the Greenland ice sheet. The resolution of the underlying DEM, which was derived primarily from radar altimetry data, yields far greater detail than earlier balance velocity estimates for Greenland. The velocity contours reveal in striking detail the location of an ice stream in northeastern Greenland, which was only recently discovered using satellite imagery. Enhanced flow associated with all of the major outlets is clearly visible, although small errors in the source data result in less accurate estimates of the absolute flow speeds. Nevertheless, the balance map is useful for ice-sheet modelling, mass balance studies, and field planning.
    Keywords: Earth Resources and Remote Sensing
    Type: Laboratory for Hydrospheric Processes Research Publications; 89-90
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    North and Northeast Greenland Ice Discharge from Satellite Radar Interferometry (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Ice discharge from north and northeast Greenland calculated from satellite radar interferometry data of 14 outlet glaciers is 3.5 times that estimated from iceberg production. The satellite estimates, obtained at the grounding line of the outlet glaciers, differ from those obtained at the glacier front, because basal melting is extensive at the underside of the floating glacier sections. The results suggest that the north and northeast parts of the Greenland ice sheet may be thinning and contributing positively to sea-level rise.
    Keywords: Earth Resources and Remote Sensing
    Type: Laboratory for Hydrospheric Processes Research Publications; 93-94
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A digital elevation model of the Greenland ice sheet and validation with airborne laser altimeter data (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A 2.5 km resolution digital elevation model (DEM) of the Greenland ice sheet was produced from the 336 days of the geodetic phase of ERS-1. During this period the altimeter was operating in ice-mode over land surfaces providing improved tracking around the margins of the ice sheet. Combined with the high density of tracks during the geodetic phase, a unique data set was available for deriving a DEM of the whole ice sheet. The errors present in the altimeter data were investigated via a comparison with airborne laser altimeter data obtained for the southern half of Greenland. Comparison with coincident satellite data showed a correlation with surface slope. An explanation for the behavior of the bias as a function of surface slope is given in terms of the pattern of surface roughness on the ice sheet.
    Keywords: Earth Resources and Remote Sensing
    Type: Proceedings of the 3rd ERS Symposium on Space at the Service of Our Environment; 2; 843-847; ESA-SP-414-Vol-2
    Format: text
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    NASA TECHNICAL REPORTS
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