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A Reconciled Estimate of Ice-Sheet Mass Balance

2012; American Association for the Advancement of Science; Volume: 338; Issue: 6111 Linguagem: Inglês

10.1126/science.1228102

1095-9203

Andrew Shepherd, Erik R. Ivins, A Geruo, Valentina R. Barletta, Michael J. Bentley, Srinivas Bettadpur, Kate Briggs, David H. Bromwich, R. Forsberg, N. Galin, Martin Horwath, Stan Jacobs, Ian Joughin, Matt A. King, Jan T. M. Lenaerts, Jilu Li, Stefan Ligtenberg, Adrian Luckman, S. B. Luthcke, Malcolm McMillan, Rakia Meister, Glenn A. Milne, J. Mouginot, Alan Muir, Julien P. Nicolas, John Paden, A. J. Payne, Hamish D. Pritchard, Eric Rignot, Helmut Rott, Louise Sandberg Sørensen, T. A. Scambos, B. Scheuchl, Ernst Schrama, Ben Smith, A. Sundal, J. H. van Angelen, Willem Jan van de Berg, M. R. van den Broeke, David G. Vaughan, I. Velicogna, John Wahr, Pippa L. Whitehouse, Duncan J. Wingham, Donghui Yi, D. A. Young, H. Jay Zwally,

Winter Sports Injuries and Performance

We combined an ensemble of satellite altimetry, interferometry, and gravimetry data sets using common geographical regions, time intervals, and models of surface mass balance and glacial isostatic adjustment to estimate the mass balance of Earth's polar ice sheets. We find that there is good agreement between different satellite methods--especially in Greenland and West Antarctica--and that combining satellite data sets leads to greater certainty. Between 1992 and 2011, the ice sheets of Greenland, East Antarctica, West Antarctica, and the Antarctic Peninsula changed in mass by -142 ± 49, +14 ± 43, -65 ± 26, and -20 ± 14 gigatonnes year(-1), respectively. Since 1992, the polar ice sheets have contributed, on average, 0.59 ± 0.20 millimeter year(-1) to the rate of global sea-level rise.