A Reconciled Estimate of Ice-Sheet Mass Balance

作者：Andrew P. Shepherd, Erik R. Ivins, A Geruo, Valentina Roberta Barletta, Mike J. Bentley, Srinivas V. Bettadpur, Kate H. Briggs, David H. Bromwich, Rene Forsberg, Natalia Galin, Martin Horwath, Stan Jacobs, Ian R. Joughin, Matt A. King, Jan T. M. Lenaerts, Jilu Li, Stefan Ligtenberg, Adrian John Luckman, S. B. Luthcke, Malcolm McMillan, Rakia Meister, Glenn A. Milne, J. Mouginot, Alan S. Muir, Julien P. Nicolas, John Paden, Anthony J. Payne, Hamish D. Pritchard, Eric J. Rignot, Helmut Rott, Louise Sandberg Sørensen, T. A. Scambos, B. Scheuchl, Ernst Schrama, Ben Smith, Aud Venke 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, Duncan Alexander Young, H. Jay Zwally · 发表于：Science · 年份：2012 · DOI：10.1126/science.1228102 · 被引用次数：1658 · 研究领域：Cryospheric studies and observations、Geophysics and Gravity Measurements、Winter Sports Injuries and Performance

Warming and Melting Mass loss from the ice sheets of Greenland and Antarctica account for a large fraction of global sea-level rise. Part of this loss is because of the effects of warmer air temperatures, and another because of the rising ocean temperatures to which they are being exposed. Joughin et al. (p. 1172 ) review how ocean-ice interactions are impacting ice sheets and discuss the possible ways that exposure of floating ice shelves and grounded ice margins are subject to the influences of warming ocean currents. Estimates of the mass balance of the ice sheets of Greenland and Antarctica have differed greatly—in some cases, not even agreeing about whether there is a net loss or a net gain—making it more difficult to project accurately future sea-level change. Shepherd et al. (p. 1183 ) combined data sets produced by satellite altimetry, interferometry, and gravimetry to construct a more robust ice-sheet mass balance for the period between 1992 and 2011. All major regions of the two ice sheets appear to be losing mass, except for East Antarctica. All told, mass loss from the polar ice sheets is contributing about 0.6 millimeters per year (roughly 20% of the total) to the current rate of global sea-level rise.