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Rapid ice discharge from southeast Greenland glaciers
Rignot, E. Braaten, David A. Gogineni, Sivaprasad Krabill, William B. McConnell, Joesph R.
Rignot, E.
Braaten, David A.
Gogineni, Sivaprasad
Krabill, William B.
McConnell, Joesph R.
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Abstract
[1] Interferometric synthetic-aperture radar (InSAR) observations of southeast Greenland glaciers acquired by the Earth Remote Sensing Satellites (ERS-1/2) in 1996 were combined with ice sounding radar data collected in the late 1990s to estimate a total discharge of 46 ± 3 km3 ice per year between 62°N and 66°N, which is significantly lower than a mass input of 29 ± 3 km3 ice per year calculated from a recent compilation of snow accumulation data. Further north, Helheim Glacier discharges 23 ± 1 km3/yr vs 30 ± 3 km3/yr accumulation; Kangerdlugssuaq Glacier discharges 29 ± 2 km3/yr vs 23 ± 2 km3/yr; and Daugaard-Jensen Glacier discharges 10.5 ± 0.6 km3/yr vs 10.5 ± 1 km3/yr. The mass balance of east Greenland glaciers is therefore dominated by the negative mass balance of southeast Greenland glaciers (−17 ± 4 km3/yr), equivalent to a sea level rise of 0.04 ± 0.01 mm/yr. Warmer and drier conditions cannot explain the imbalance which we attribute to long-term changes in ice dynamics.
Description
This is the published version, also available here: http://dx.doi.org/10.1029/2004GL019474.
Date
2004-03-25
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Publisher
Wiley
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Keywords
Glaciology, Interferometry, Remote sensing, Sea level: variations and mean
Citation
Rignot, E., D. Braaten, S. P. Gogineni, W. B. Krabill, and J. R. McConnell (2004), Rapid ice discharge from southeast Greenland glaciers, Geophys. Res. Lett., 31, L10401, http://dx.doi.org/10.1029/2004GL019474.