Large fluctuations in speed on Greenland's Jakobshavn Isbræ glacier

@article{Joughin2004LargeFI,
  title={Large fluctuations in speed on Greenland's Jakobshavn Isbr{\ae} glacier},
  author={Ian R. Joughin and Waleed Abdalati and Mark A. Fahnestock},
  journal={Nature},
  year={2004},
  volume={432},
  pages={608-610}
}
It is important to understand recent changes in the velocity of Greenland glaciers because the mass balance of the Greenland Ice Sheet is partly determined by the flow rates of these outlets. Jakobshavn Isbræ is Greenland's largest outlet glacier, draining about 6.5 per cent of the ice-sheet area, and it has been surveyed repeatedly since 1991 (ref. 2). Here we use remote sensing data to measure the velocity of Jakobshavn Isbræ between 1992 and 2003. We detect large variability of the velocity… Expand

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References

SHOWING 1-10 OF 41 REFERENCES
Investigation of surface melting and dynamic thinning on Jakobshavn Isbrae, Greenland
Jakobshavn Isbrae is the most active glacier in Greenland, with an annual discharge of about 30 km 3 of ice, and it is one of the few recently surveyed glaciers to thicken between 1993 and 1998,Expand
Calculation of Ice Velocities in the Jakobshavn Isbrae Area Using Airborne Laser Altimetry
Abstract The ability to measure velocities of fast-moving glaciers is essential to the understanding and interpretation of their dynamics and related processes. This is especially important in theExpand
Jakobshavns Isbræ, West Greenland: seasonal variations in velocity -- or lack thereof
The lower 80 km of the fast-moving lakobshavns Isbra:, West Greenland, is subject to significant melting during the summer season. The melt water drains into large supraglacial rivers which pour intoExpand
Surficial glaciology of Jakobshavns Isbræ, West Greenland: Part I. Surface morphology
Jakobshavns Isbrae is a large, fast-moving ice stream/outlet glacier in West Greenland which ends at a floating, calving front. It drains about 6.5% of the area of the Greenland ice sheet. Studies ofExpand
Jakobshavn Glacier, west Greenland: 30 years of spaceborne observations
Early 1960's reconnaissance satellite images are compared to more recent image and map data in an inter- annual and seasonal study of West Central Greenland margin fluctuations. From 1962 to 1992,Expand
Greenland Ice Sheet melt extent: 1979–1999
Analysis of melt extent on the Greenland ice sheet is updated to span the time period 1979-1999 and examined along with its spatial and temporal variability using passive microwave satellite data. ToExpand
A Mini-Surge on the Ryder Glacier, Greenland, Observed by Satellite Radar Interferometry
Satellite radar interferometry reveals that the speed of the Ryder Glacier increased roughly threefold and then returned to normal (100 to 500 meters/year) over a 7-week period near the end of theExpand
Acceleration of Pine Island and Thwaites Glaciers, West Antarctica
Abstract Recent satellite investigations revealed that in the 1990s the grounding line of Pine Island and Thwaites Glaciers, West Antarctica, retreated several km, the ice surface on the interior ofExpand
Three-dimensional glacial flow and surface elevation measured with radar interferometry
Outlet glaciers—which serve to drain ice from ice sheets—seem to be dynamically less stable in North Greenland than in South Greenland. Storstrømmen, a large outlet glacier in northeastern GreenlandExpand
Northern Larsen Ice Shelf, Antarctica: further retreat after collapse
Abstract Changes of Larsen Ice Shelf, Antarctica, and the surrounding glaciers after its collapse in 1995 were investigated using satellite radar imagery, with emphasis on changes in the glaciersExpand
...
1
2
3
4
5
...