Volume loss from Antarctic ice shelves is accelerating
2015; American Association for the Advancement of Science; Volume: 348; Issue: 6232 Linguagem: Inglês
10.1126/science.aaa0940
ISSN1095-9203
AutoresF. S. Paolo, H. A. Fricker, Laurie Padman,
Tópico(s)Landslides and related hazards
ResumoThe floating ice shelves surrounding the Antarctic Ice Sheet restrain the grounded ice-sheet flow. Thinning of an ice shelf reduces this effect, leading to an increase in ice discharge to the ocean. Using 18 years of continuous satellite radar altimeter observations, we have computed decadal-scale changes in ice-shelf thickness around the Antarctic continent. Overall, average ice-shelf volume change accelerated from negligible loss at 25 ± 64 cubic kilometers per year for 1994–2003 to rapid loss of 310 ± 74 cubic kilometers per year for 2003–2012. West Antarctic losses increased by ~70% in the past decade, and earlier volume gain by East Antarctic ice shelves ceased. In the Amundsen and Bellingshausen regions, some ice shelves have lost up to 18% of their thickness in less than two decades.
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