Assessing the contribution of internal climate variability to anthropogenic changes in ice sheet volume

Understanding ice sheet response to different sources of uncertainty in projecting the climate is essential for assessing long‐term risk of sea level rise (SLR). The impact of uncertainty caused by internal climate variability (ICV) on future ice sheet changes has not been assessed explicitly. Here we estimate how ICV affects ice sheet projections using a three‐dimensional ice sheet model driven by climate fields from two large ensembles of climate model simulations differing in initial climate states. We find that ICV causes approximately 2 mm uncertainty in the estimated SLR due to Greenland ice sheet mass loss during 1992–2011, which is nearly double the observational uncertainty. Additionally, SLR differences due to ICV are about 17% of the mean total change of SLR in 2100. This study highlights a critical need to assess uncertainties of projecting ice sheet loss due to ICV to obtain robust estimates of both historical and future SLR.

[1]  Ian M. Howat,et al.  On the recent contribution of the Greenland ice sheet to sea level change , 2016 .

[2]  L. Ridolfi,et al.  Stochastic ice stream dynamics , 2016, Proceedings of the National Academy of Sciences.

[3]  R. DeConto,et al.  Contribution of Antarctica to past and future sea-level rise , 2016, Nature.

[4]  K.,et al.  The Community Earth System Model (CESM) large ensemble project: a community resource for studying climate change in the presence of internal climate variability , 2015 .

[5]  C. Deser,et al.  Quantifying the Role of Internal Climate Variability in Future Climate Trends , 2015 .

[6]  C. Forest,et al.  Effects of initial conditions uncertainty on regional climate variability: An analysis using a low‐resolution CESM ensemble , 2015 .

[7]  U. Mikolajewicz,et al.  Coupled simulations of Greenland Ice Sheet and climate change up to A.D. 2300 , 2015 .

[8]  Richard B. Alley,et al.  Potential Antarctic Ice Sheet retreat driven by hydrofracturing and ice cliff failure , 2015 .

[9]  Ed Hawkins,et al.  Influence of internal variability on Arctic sea-ice trends , 2015 .

[10]  T. Shepherd.  Atmospheric circulation as a source of uncertainty in climate change projections , 2014 .

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

[12]  P. Huybrechts,et al.  Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming , 2014 .

[13]  Miren Vizcaino,et al.  Ice sheets as interactive components of Earth System Models: progress and challenges , 2014 .

[14]  J. Wallace,et al.  Tropical forcing of the recent rapid Arctic warming in northeastern Canada and Greenland , 2014, Nature.

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

[16]  C. Deser,et al.  Internal Variability in Projections of Twenty-First-Century Arctic Sea Ice Loss: Role of the Large-Scale Atmospheric Circulation , 2014 .

[17]  O. Johannessen,et al.  Greenland ice sheet contribution to future global sea level rise based on CMIP5 models , 2014, Advances in Atmospheric Sciences.

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

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

[20]  X. Fettweis,et al.  Future projections of the Greenland ice sheet energy balance driving the surface melt , 2013 .

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

[22]  C. Deser,et al.  Communication of the role of natural variability in future North American climate , 2012 .

[23]  David Pollard,et al.  Description of a hybrid ice sheet-shelf model, and application to Antarctica , 2012 .

[24]  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 .

[25]  S. Levitus,et al.  World ocean heat content and thermosteric sea level change (0–2000 m), 1955–2010 , 2012 .

[26]  Karl E. Taylor,et al.  An overview of CMIP5 and the experiment design , 2012 .

[27]  X. Fettweis,et al.  Sensitivity of a Greenland ice sheet model to atmospheric forcing fields , 2012 .

[28]  C. Deser,et al.  Uncertainty in climate change projections: the role of internal variability , 2012, Climate Dynamics.

[29]  K. Calvin,et al.  The RCP greenhouse gas concentrations and their extensions from 1765 to 2300 , 2011 .

[30]  R. DeConto,et al.  Late Pliocene to Pleistocene sensitivity of the Greenland Ice Sheet in response to external forcing and internal feedbacks , 2011 .

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

[32]  David Pollard,et al.  A retrospective look at coupled ice sheet–climate modeling , 2010 .

[33]  John F. B. Mitchell,et al.  The next generation of scenarios for climate change research and assessment , 2010, Nature.

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

[35]  E. Hawkins,et al.  The Potential to Narrow Uncertainty in Regional Climate Predictions , 2009 .

[36]  R. DeConto,et al.  Modelling West Antarctic ice sheet growth and collapse through the past five million years , 2009, Nature.

[37]  Edward Hanna,et al.  Increased Runoff from Melt from the Greenland Ice Sheet: A Response to Global Warming , 2008 .

[38]  Reto Knutti,et al.  The use of the multi-model ensemble in probabilistic climate projections , 2007, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[39]  R. Alley,et al.  Ice-Sheet and Sea-Level Changes , 2005, Science.

[40]  M. Webb,et al.  Quantification of modelling uncertainties in a large ensemble of climate change simulations , 2004, Nature.

[41]  Jonathan M. Gregory,et al.  Climatology: Threatened loss of the Greenland ice-sheet , 2004, Nature.

[42]  T. Crowley,et al.  Stochastic forcing of Pleistocene ice sheets: Implications for the origin of millennial‐scale climate oscillations , 2002 .

[43]  M. Jakeman.  Sensitivity or what? , 2001, British journal of perioperative nursing : the journal of the National Association of Theatre Nurses.

[44]  Atsumu Ohmura,et al.  Physical Basis for the Temperature-Based Melt-Index Method , 2001 .

[45]  J. A. Church,et al.  Sea Level Change , 2019, Encyclopedia of Ocean Sciences.

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

[47]  E. van Meijgaard,et al.  The KNMI regional atmospheric climate model RACMO version 2.1 , 2008 .

[48]  R. Braithwaite.  Positive degree-day factors for ablation on the Greenland ice sheet studied by energy-balance modelling , 1995, Journal of Glaciology.