On the recent contribution of the Greenland ice sheet to sea level change

Abstract. We assess the recent contribution of the Greenland ice sheet (GrIS) to sea level change. We use the mass budget method, which quantifies ice sheet mass balance (MB) as the difference between surface mass balance (SMB) and solid ice discharge across the grounding line (D). A comparison with independent gravity change observations from GRACE shows good agreement for the overlapping period 2002–2015, giving confidence in the partitioning of recent GrIS mass changes. The estimated 1995 value of D and the 1958–1995 average value of SMB are similar at 411 and 418 Gt yr−1, respectively, suggesting that ice flow in the mid-1990s was well adjusted to the average annual mass input, reminiscent of an ice sheet in approximate balance. Starting in the early to mid-1990s, SMB decreased while D increased, leading to quasi-persistent negative MB. About 60 % of the associated mass loss since 1991 is caused by changes in SMB and the remainder by D. The decrease in SMB is fully driven by an increase in surface melt and subsequent meltwater runoff, which is slightly compensated by a small (

[1]  S. Ligtenberg,et al.  Meltwater retention within the Greenland ice sheet percolation zone: a near-binary separation between firn aquifers and impermeable ice slabs? , 2018 .

[2]  Edward Hanna,et al.  Greenland Blocking Index 1851–2015: a regional climate change signal , 2016 .

[3]  X. Fettweis,et al.  A daily, 1 km resolution data set of downscaled Greenland ice sheet surface mass balance (1958–2015) , 2016 .

[4]  X. Fettweis,et al.  Arctic cut-off high drives the poleward shift of a new Greenland melting record , 2016, Nature Communications.

[5]  E. Mosley‐Thompson,et al.  Greenland meltwater storage in firn limited by near-surface ice formation , 2016 .

[6]  J. Box,et al.  The implication of nonradiative energy fluxes dominating Greenland ice sheet exceptional ablation area surface melt in 2012 , 2016 .

[7]  J. McLeod,et al.  Linking interannual variability in extreme Greenland blocking episodes to the recent increase in summer melting across the Greenland ice sheet , 2016 .

[8]  M. R. van den Broeke,et al.  Clouds enhance Greenland ice sheet meltwater runoff , 2016, Nature Communications.

[9]  E. Willerslev,et al.  Spatial and temporal distribution of mass loss from the Greenland Ice Sheet since AD 1900 , 2015, Nature.

[10]  E. Morris,et al.  Greenland annual accumulation along the EGIG line, 1959–2004, from ASIRASairborne radar and neutron-probe density measurements , 2015 .

[11]  R. S. W. van de Wal,et al.  Evaluation of the updated regional climate model RACMO2.3: summer snowfall impact on the Greenland Ice Sheet , 2015 .

[12]  A. B. Mikkelsen,et al.  Amplified melt and flow of the Greenland ice sheet driven by late-summer cyclonic rainfall , 2015 .

[13]  E. Mosley‐Thompson,et al.  Elevation change of the Greenland Ice Sheet due to surface mass balance and firn processes, 1960–2014 , 2015 .

[14]  E. Mosley‐Thompson,et al.  Changes in the firn structure of the western Greenland Ice Sheet caused by recent warming , 2015 .

[15]  M. Watkins,et al.  Improved methods for observing Earth's time variable mass distribution with GRACE using spherical cap mascons , 2015 .

[16]  J. Orwig.  Human actions affect Greenland Ice Sheet surface mass balance , 2014 .

[17]  Kyle Duncan,et al.  Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics , 2014, Proceedings of the National Academy of Sciences.

[18]  Ian Joughin,et al.  Distinct patterns of seasonal Greenland glacier velocity , 2014, Geophysical research letters.

[19]  M. Broeke,et al.  Contemporary (1960–2012) Evolution of the Climate and Surface Mass Balance of the Greenland Ice Sheet , 2014, Surveys in Geophysics.

[20]  Angelika Humbert,et al.  Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2 , 2014 .

[21]  Dong Eun Lee,et al.  Climatology and Variability of Precipitation in the Twentieth-Century Reanalysis , 2014 .

[22]  Richard R. Forster,et al.  Extensive liquid meltwater storage in firn within the Greenland ice sheet , 2014 .

[23]  S. Ligtenberg,et al.  Explaining the presence of perennial liquid water bodies in the firn of the Greenland Ice Sheet , 2014 .

[24]  W. Lipscomb,et al.  Future climate warming increases Greenland ice sheet surface mass balance variability , 2014 .

[25]  Myoung-Jong Noh,et al.  An improved mass budget for the Greenland ice sheet , 2013 .

[26]  Jason E. Box,et al.  Greenland Ice Sheet Mass Balance Reconstruction. Part III: Marine Ice Loss and Total Mass Balance (1840–2010) , 2013 .

[27]  Matt A. King,et al.  Winter motion mediates dynamic response of the Greenland Ice Sheet to warmer summers , 2013, Geophysical Research Letters.

[28]  Ingo Sasgen,et al.  Limits in detecting acceleration of ice sheet mass loss due to climate variability , 2013 .

[29]  Edward Hanna,et al.  Ice-sheet mass balance and climate change , 2013, Nature.

[30]  K. Steffen,et al.  July 2012 Greenland melt extent enhanced by low-level liquid clouds , 2013, Nature.

[31]  X. Fettweis,et al.  Atmospheric and oceanic climate forcing of the exceptional Greenland ice sheet surface melt in summer 2012 , 2013 .

[32]  K. Steffen,et al.  The influence of North Atlantic atmospheric and oceanic forcing effects on 1900–2010 Greenland summer climate and ice melt/runoff , 2013 .

[33]  J. Wahr,et al.  Computations of the viscoelastic response of a 3-D compressible Earth to surface loading: an application to Glacial Isostatic Adjustment in Antarctica and Canada , 2012 .

[34]  Xavier Fettweis,et al.  Evidence and analysis of 2012 Greenland records from spaceborne observations, a regional climate model and reanalysis data , 2012 .

[35]  Eric Rignot,et al.  A Reconciled Estimate of Ice-Sheet Mass Balance , 2012, Science.

[36]  X. Fettweis,et al.  Greenland ice-sheet contribution to sea-level rise buffered by meltwater storage in firn , 2012, Nature.

[37]  M. Stibal,et al.  Biological processes on glacier and ice sheet surfaces , 2012 .

[38]  X. Fettweis,et al.  Brief communication "Important role of the mid-tropospheric atmospheric circulation in the recent surface melt increase over the Greenland ice sheet" , 2012 .

[39]  Xavier Fettweis,et al.  Surface mass balance model intercomparison for the Greenland ice sheet , 2012 .

[40]  E. Meijgaard,et al.  Drifting snow climate of the Greenland ice sheet: a study with a regional climate model , 2012 .

[41]  J. Box,et al.  Evidence of meltwater retention within the Greenland ice sheet , 2012 .

[42]  X. Fettweis,et al.  Greenland ice sheet albedo feedback: thermodynamics and atmospheric drivers , 2012 .

[43]  M. R. van den Broeke,et al.  Aerial Photographs Reveal Late–20th-Century Dynamic Ice Loss in Northwestern Greenland , 2012, Science.

[44]  Xavier Fettweis,et al.  Estimating the Greenland ice sheet surface mass balance contribution to future sea level rise using the regional atmospheric climate model MAR , 2012 .

[45]  Jian Wang,et al.  Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change , 2012, Proceedings of the National Academy of Sciences.

[46]  Eric Rignot,et al.  Timing and origin of recent regional ice-mass loss in Greenland , 2012 .

[47]  Konrad Steffen,et al.  Greenland Ice Sheet surface mass balance 1870 to 2010 based on Twentieth Century Reanalysis, and links with global climate forcing , 2011 .

[48]  I. Joughin,et al.  21st-Century Evolution of Greenland Outlet Glacier Velocities , 2011, Science.

[49]  Ian M. Howat,et al.  Multi-decadal retreat of Greenland’s marine-terminating glaciers , 2011, Journal of Glaciology.

[50]  Matt A. King,et al.  Seasonal variations in Greenland Ice Sheet motion: inland extent and behaviour at higher elevations in a land-terminating transect , 2011 .

[51]  Eric Rignot,et al.  Acceleration of the contribution of the Greenland and Antarctic ice sheets to sea level rise , 2011 .

[52]  M. Flanner,et al.  A new albedo parameterization for use in climate models over the Antarctic ice sheet , 2011 .

[53]  R. Hock,et al.  Regionally differentiated contribution of mountain glaciers and ice caps to future sea-level rise , 2011 .

[54]  Kelly Elder,et al.  An Improved Snow Scheme for the ECMWF Land Surface Model: Description and Offline Validation , 2010 .

[55]  S. Warren,et al.  The ablation zone in northeast Greenland: ice types, albedos and impurities , 2010, Journal of Glaciology.

[56]  M. R. van den Broeke,et al.  Partitioning Recent Greenland Mass Loss , 2009, Science.

[57]  M. R. van den Broeke,et al.  Higher surface mass balance of the Greenland ice sheet revealed by high‐resolution climate modeling , 2009 .

[58]  Eric Rignot,et al.  Mass balance of the Greenland ice sheet from 1958 to 2007 , 2008 .

[59]  D. Chambers,et al.  GRACE observes small‐scale mass loss in Greenland , 2008 .

[60]  C. J. P. P. Smeets,et al.  Large and Rapid Melt-Induced Velocity Changes in the Ablation Zone of the Greenland Ice Sheet , 2008, Science.

[61]  Ian Joughin,et al.  Seasonal Speedup Along the Western Flank of the Greenland Ice Sheet , 2008, Science.

[62]  J. Wahr,et al.  Acceleration of Greenland ice mass loss in spring 2004 , 2006, Nature.

[63]  S. Swenson,et al.  Accuracy of GRACE mass estimates , 2006 .

[64]  E. Rignot,et al.  Changes in the Velocity Structure of the Greenland Ice Sheet , 2006, Science.

[65]  Crystal B. Schaaf,et al.  Accuracy assessment of the MODIS 16-day albedo product for snow: comparisons with Greenland in situ measurements , 2005 .

[66]  R. Fausto,et al.  Ablation observations for 2008-2011 from the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) , 1969 .

[67]  E. Morris,et al.  Greenland annual accumulation along the EGIG line , 1959 – 2004 , from ASIRAS airborne radar and detailed neutron-probe density measurements , 2015 .

[68]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[69]  Xavier Fettweis,et al.  The role of albedo and accumulation in the 2010 melting record in Greenland , 2011 .

[70]  W. Krabill,et al.  A comparison of Greenland ice-sheet volume changes derived from altimetry measurements , 2008, Journal of Glaciology.