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  3. Large Fluctuations In Speed On Greenland's Jakobshavn Isbrae Glacier.
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  3. Large Fluctuations In Speed On Greenland's Jakobshavn Isbrae Glacier.

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Large fluctuations in speed on Greenland's Jakobshavn Isbrae glacier.

Ian Joughin1, Waleed Abdalati, Mark Fahnestock

  • 1Jet Propulsion Lab, California Institute of Technology, USA. ian@apl.washington.edu

Nature
|December 4, 2004

View abstract on PubMed

Summary
This summary is machine-generated.

Greenland

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Area of Science:

  • Glaciology
  • Climate Science
  • Remote Sensing

Background:

  • Greenland Ice Sheet mass balance is influenced by outlet glacier flow rates.
  • Jakobshavn Isbrae, Greenland's largest outlet glacier, has been repeatedly surveyed since 1991.
  • Understanding glacier velocity changes is crucial for ice sheet mass balance assessments.

Purpose of the Study:

  • To measure the velocity of Jakobshavn Isbrae between 1992 and 2003 using remote sensing data.
  • To analyze temporal variations in glacier flow speed.
  • To assess the impact of glacier velocity changes on ice discharge.

Main Methods:

  • Utilized remote sensing data for velocity measurements.
  • Analyzed glacier velocity data from 1992 to 2003.
  • Correlated velocity changes with glacier thickening and thinning.

Main Results:

  • Detected significant temporal variability in Jakobshavn Isbrae's velocity.
  • Observed a decrease in velocity from 1985 to 1992, followed by a substantial increase by 2003.
  • Velocity changes align with observed glacier thickening and thinning patterns.

Conclusions:

  • Fast-flowing glaciers can significantly alter ice discharge on sub-decadal timescales.
  • Glacier velocity dynamics indicate a potential for rapid response to climate change.
  • Recent changes in Jakobshavn Isbrae's velocity highlight its sensitivity to climatic shifts.