Elevation Changes in Antarctica Mainly Determined by Accumulation Variability

Antarctic Ice Sheet elevation changes, which are used to estimate changes in the mass of the interior regions, are caused by variations in the depth of the firn layer. We quantified the effects of temperature and accumulation variability on firn layer thickness by simulating the 1980–2004 Antarctic...

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Bibliographic Details
Published in:Science
Main Authors: Helsen, Michiel M., van den Broeke, Michiel R., van de Wal, Roderik S. W., van de Berg, Willem Jan, van Meijgaard, Erik, Davis, Curt H., Li, Yonghong, Goodwin, Ian
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 2008
Subjects:
Amundsen Sea
Antarctic
East Antarctic Ice Sheet
Antarc*
Antarctica
Ice Sheet
Online Access:http://dx.doi.org/10.1126/science.1153894
https://www.science.org/doi/pdf/10.1126/science.1153894
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Summary:Antarctic Ice Sheet elevation changes, which are used to estimate changes in the mass of the interior regions, are caused by variations in the depth of the firn layer. We quantified the effects of temperature and accumulation variability on firn layer thickness by simulating the 1980–2004 Antarctic firn depth variability. For most of Antarctica, the magnitudes of firn depth changes were comparable to those of observed ice sheet elevation changes. The current satellite observational period (∼15 years) is too short to neglect these fluctuations in firn depth when computing recent ice sheet mass changes. The amount of surface lowering in the Amundsen Sea Embayment revealed by satellite radar altimetry (1995–2003) was increased by including firn depth fluctuations, while a large area of the East Antarctic Ice Sheet slowly grew as a result of increased accumulation.

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