Intermittent thinning of Jakobshavn Isbræ, West Greenland, since the Little Ice Age
نویسندگان
چکیده
منابع مشابه
Bed topography of Jakobshavn Isbræ, Greenland, and Byrd Glacier, Antarctica
This paper presents the bed topography of Jakobshavn Isbræ, Greenland, and Byrd Glacier, Antarctica, derived from sounding these glaciers with high-sensitivity radars. To understand the processes causing the speed-up and retreat of outlet glaciers, and to enable the development of nextgeneration ice-sheet models, we need information on bed topography and basal conditions. To this end, we perfor...
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[1] We used time-lapse imagery, seismic and audio recordings, iceberg and glacier velocities, ocean wave measurements, and simple theoretical considerations to investigate the interactions between Jakobshavn Isbræ and its proglacial ice mélange. The mélange behaves as a weak, granular ice shelf whose rheology varies seasonally. Sea ice growth in winter stiffens the mélange matrix by binding ice...
متن کاملUsing proglacial-threshold lakes to constrain fluctuations of the Jakobshavn Isbræ ice margin, western Greenland, during the Holocene
The future response of the Greenland Ice Sheet (GIS) and its potential contribution to sea level rise are uncertain. Rapid changes of Greenland’s outlet glaciers over the past decade have made it difficult to extrapolate ice sheet change into the future. This significant short-term variability highlights the need for longer-term, geologic (e.g., Holocene) records of ice margin fluctuations. How...
متن کاملGlacial rumblings from Jakobshavn ice stream, Greenland
The steep increase in Greenland’s glacial earthquake activity detected by the Global Seismographic Network since the late 1990s suggests that a close inspection of these events might provide clues to the nature and origin of such seismic activity. Here we discuss the detection of large, unexpected seismic events of extraordinarily long duration (10–40min) occurring about once every 2 days, and ...
متن کاملAnalysis of the Motion Behaviour of Jakobshavn Isbræ Glacier in Greenland by Monocular Image Sequence Analysis
Jakobshavn Isbræ on the west coast of Greenland is one of the fastest and most productive glaciers in the world. It has been moving with an average velocity of 20 meters per day over a long time, producing to total annual iceberg volume of 30 40 km. In recent years a dramatic retreat of the glacier front has been observed. At the same time, a significant increase of the moving velocity has been...
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ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 2008
ISSN: 0022-1430,1727-5652
DOI: 10.3189/002214308784409035