Forty-six years of Greenland Ice Sheet mass balance from 1972 to 2018

• DOI: 10.1073/pnas.1904242116
• Publication Date: 2019-04-23T00:49:18Z
• Authors: Jérémie Mouginot; Eric Rignot; Anders A. Bjørk; Michiel van den B...; Romain Millan; Mathieu Morlighem; Brice Noël; Bernd Scheuchl; Michael Wood
• Keywords: [SDE] Environmental Sciences; [SDE.MCG]Environmental Sciences/Global Changes; Greenland; sea level; 15. Life on land; 01 natural sciences; Climate Action; [SDE.MCG] Environmental Sciences/Global Changes; climate change; 13. Climate action; [SDE]Environmental Sciences; glaciology; Physical Sciences; SDG 13 - Climate Action; glaciers; 0105 earth and related environmental sciences

We reconstruct the mass balance of Greenland Ice Sheet using a comprehensive survey thickness, surface elevation, velocity, and (SMB) 260 glaciers from 1972 to 2018. calculate discharge, D, into ocean directly for 107 (85% D) indirectly 110 (15%) velocity-scaled reference fluxes. The decadal switched gain +47 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo>±</mml:mo> </mml:math> 21 Gt/y in 1972–1980 loss 51 17 1980–1990. increased 41 1990–2000, 187 2000–2010, 286 20 2010–2018, or sixfold since 1980s, 80 6 per decade, on average. acceleration positive 2000–2010 negative 2010–2018 due series cold summers, which illustrates difficulty extrapolating short records longer-term trends. Cumulated 1972, largest contributions global sea level rise are northwest (4.4 0.2 mm), southeast (3.0 0.3 central west (2.0 mm) Greenland, with total 13.7 1.1 mm ice sheet. is controlled at 66 8% by glacier dynamics (9.1 34 SMB (4.6 mm). Even years high SMB, enhanced discharge has remained sufficiently above equilibrium maintain an annual every year 1998.