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Rapid volume loss from two East Greenland outlet glaciers quantified using repeat stereo satellite imagery
Author(s) -
Stearns Leigh A.,
Hamilton Gordon S.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028982
Subject(s) - geology , glacier , thinning , greenland ice sheet , satellite imagery , ice stream , digital elevation model , ice sheet , satellite , climatology , physical geography , oceanography , geomorphology , cryosphere , sea ice , remote sensing , geography , engineering , aerospace engineering , forestry
The coastal portions of Kangerdlugssuaq and Helheim glaciers in southeast Greenland lost at least 51 ± 8 km 3 yr −1 of ice between 2001–2006 due to thinning and retreat, according to an analysis of sequential digital elevation models (DEMs) derived from stereo ASTER satellite imagery. The dominant contribution to this ice loss was dynamic thinning caused by the acceleration in flow of both glaciers. Peak rates of change, including thinning rates of ∼90 m yr −1 , coincided with the rapid increases in flow speed. Extrapolation of the measured data to the ice divides yields an estimated combined catchment volume loss of ∼122 ± 30 km 3 yr −1 , which accounts for half the total mass loss from the ice sheet reported in recent studies. These catchment‐wide volume losses contributed ∼0.31 ± 0.07 mm yr −1 to global sea level rise over the 5‐year observation period with the coastal regions alone contributing at least 0.1 ± 0.02 mm yr −1 .