Mass balance of the Antarctic Ice Sheet from 1992 to 2017

Shepherd, Andrew and Ivins, Erik and Rignot, Eric and Smith, Ben and Van Den Broeke, Michiel and Velicogna, Isabella and Whitehouse, Pippa and Briggs, Kate and Joughin, Ian and Krinner, Gerhard and Nowicki, Sophie and Payne, Tony and Scambos, Ted and Schlegel, Nicole and Geruo, A. and Agosta, Cécile and Ahlstrøm, Andreas and Babonis, Greg and Barletta, Valentina and Blazquez, Alejandro and Bonin, Jennifer and Csatho, Beata and Cullather, Richard and Felikson, Denis and Fettweis, Xavier and Forsberg, Rene and Gallee, Hubert and Gardner, Alex and Gilbert, Lin and Groh, Andreas and Gunter, Brian and Hanna, Edward and Harig, Christopher and Helm, Veit and Horvath, Alexander and Horwath, Martin and Khan, Shfaqat and Kjeldsen, Kristian K. and Konrad, Hannes and Langen, Peter and Lecavalier, Benoit and Loomis, Bryant and Luthcke, Scott and McMillan, Malcolm and Melini, Daniele and Mernild, Sebastian and Mohajerani, Yara and Moore, Philip and Mouginot, Jeremie and Moyano, Gorka (2018) Mass balance of the Antarctic Ice Sheet from 1992 to 2017. Nature, 558 (7709). pp. 219-222. ISSN 0028-0836

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The Antarctic Ice Sheet is an important indicator of climate change and driver of sea-level rise. Here we combine satellite observations of its changing volume, flow and gravitational attraction with modelling of its surface mass balance to show that it lost 2,720 ± 1,390 billion tonnes of ice between 1992 and 2017, which corresponds to an increase in mean sea level of 7.6 ± 3.9 millimetres (errors are one standard deviation). Over this period, ocean-driven melting has caused rates of ice loss from West Antarctica to increase from 53 ± 29 billion to 159 ± 26 billion tonnes per year; ice-shelf collapse has increased the rate of ice loss from the Antarctic Peninsula from 7 ± 13 billion to 33 ± 16 billion tonnes per year. We find large variations in and among model estimates of surface mass balance and glacial isostatic adjustment for East Antarctica, with its average rate of mass gain over the period 1992-2017 (5 ± 46 billion tonnes per year) being the least certain.

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© 2018 Macmillan Publishers Limited, part of Springer Nature. This is an author produced version of a paper published in Nature. Uploaded in accordance with the publisher's self-archiving policy.
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06 Nov 2018 10:12
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29 Sep 2020 04:37