Elevation changes in antarctica mainly determined by accumulation variability

Michiel M. Helsen, Michiel R. Van Den Broeke, Roderik S.W. Van De Wal, Willem Jan Van De Berg, Erik Van Meijgaard, Curt H. Davis, Yonghong Li, Ian Goodwin

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1626-1629
Number of pages4
JournalScience
Volume320
Issue number5883
DOIs
Publication statusPublished - 20 Jun 2008

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