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Antarctic elevation change from 1992 to 1996

Wingham1, Ridout, Scharroo

  • 1D. J. Wingham, A. J. Ridout, R. J. Arthern, Department of Space and Climate Physics, University College London, 17-19 Gordon Street, London WC1H 0AH, UK. R. Scharroo, Delft Institute for Earth-Oriented Space Research, Delft University of Technology.

Science (New York, N.Y.)
|October 17, 1998
PubMed
Summary

Antarctic Ice Sheet interior elevation decreased annually from 1992-1996. Accounting for snowfall variability, the interior

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Area of Science:

  • * Glaciology
  • * Climate Science
  • * Remote Sensing

Background:

  • * The Antarctic Ice Sheet's interior mass balance is crucial for global sea-level rise predictions.
  • * Previous studies have yielded conflicting data on the ice sheet's stability.
  • * Understanding regional elevation changes provides insights into ice sheet dynamics.

Purpose of the Study:

  • * To quantify changes in the Antarctic Ice Sheet interior's average elevation.
  • * To assess the ice sheet's mass imbalance considering snowfall variability.

Main Methods:

  • * Analysis of satellite radar altimeter data from 1992 to 1996.
  • * Incorporation of Antarctic ice core data to account for snowfall variability.

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Main Results:

  • * A statistically significant decrease in the Antarctic Ice Sheet interior's average elevation of 0.9 +/- 0.5 cm/year was observed.
  • * When snowfall variability was considered, the interior's mass imbalance this century was found to be -0.06 +/- 0.08 of the mean mass accumulation rate.

Conclusions:

  • * The Antarctic Ice Sheet interior experienced a net surface lowering between 1992 and 1996.
  • * The calculated mass imbalance suggests relative stability in the interior when snowfall variability is factored in.
  • * Continued monitoring is essential to understand long-term trends and potential impacts on sea level.