A reconciled estimate of ice-sheet mass balance

Shepherd, Andrew and Ivins, Erik R. and Geruo, A. and Barletta, Valentina R. and Bentley, Mike J. and Bettadpur, Srinivas and Briggs, Kate H. and Bromwich, David H. and Forsberg, René and Galin, Natalia and Horwath, Martin and Jacobs, Stan and Joughin, Ian and King, Matt A. and Lenaerts, Jan T.M. and Li, Jilu and Ligtenberg, Stefan R.M. and Luckman, Adrian and Luthcke, Scott B. and McMillan, Malcolm and Meister, Rakia and Milne, Glenn and Mouginot, Jeremie and Muir, Alan and Nicolas, Julien P. and Paden, John and Payne, Antony J. and Pritchard, Hamish and Rignot, Eric and Rott, Helmut and Sørensen, Louise Sandberg and Scambos, Ted A. and Scheuchl, Bernd and Schrama, Ernst J.O. and Smith, Ben and Sundal, Aud V. and Van Angelen, Jan H. and Van De Berg, Willem J. and Van Den Broeke, Michiel R. and Vaughan, David G. and Velicogna, Isabella and Wahr, John and Whitehouse, Pippa L. and Wingham, Duncan J. and Yi, Donghui and Young, Duncan and Zwally, H. Jay (2012) A reconciled estimate of ice-sheet mass balance. Science, 338 (6111). pp. 1183-1189. ISSN 0036-8075

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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.

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06 Nov 2018 08:50
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19 Sep 2023 02:02