[en] Quantifying the Greenland Ice Sheet's future contribution to sea level rise is a challenging task that requires accurate estimates of ice sheet sensitivity to climate change. Forward ice sheet models are promising tools for estimating future ice sheet behavior, yet confidence is low because evaluation of historical simulations is challenging due to the scarcity of continental-wide data for model evaluation. Recent advancements in processing of Gravity Recovery and Climate Experiment (GRACE) data using Bayesian-constrained mass concentration ("mascon") functions have led to improvements in spatial resolution and noise reduction of monthly global gravity fields. Specifically, the Jet Propulsion Laboratory's JPL RL05M GRACE mascon solution (GRACE_JPL) offers an opportunity for the assessment of model-based estimates of ice sheet mass balance (MB) at ∼ 300 km spatial scales. Here, we quantify the differences between Greenland monthly observed MB (GRACE_JPL) and that estimated by state-of-the-art, high-resolution models, with respect to GRACE_JPL and model uncertainties. To simulate the years 2003–2012, we force the Ice Sheet System Model (ISSM) with anomalies from three different surface mass balance (SMB) products derived from regional climate models. Resulting MB is compared against GRACE_JPL within individual mascons. Overall, we find agreement in the northeast and southwest where MB is assumed to be primarily controlled by SMB. In the interior, we find a discrepancy in trend, which we presume to be related to millennial-scale dynamic thickening not considered by our model. In the northwest, seasonal amplitudes agree, but modeled mass trends are muted relative to GRACE_JPL. Here, discrepancies are likely controlled by temporal variability in ice discharge and other related processes not represented by our model simulations, i.e., hydrological processes and ice–ocean interaction. In the southeast, GRACE_JPL exhibits larger seasonal amplitude than predicted by the models while simultaneously having more pronounced trends; thus, discrepancies are likely controlled by a combination of missing processes and errors in both the SMB products and ISSM. At the margins, we find evidence of consistent intra-annual variations in regional MB that deviate distinctively from the SMB annual cycle. Ultimately, these monthly-scale variations, likely associated with hydrology or ice–ocean interaction, contribute to steeper negative mass trends observed by GRACE_JPL. Thus, models should consider such processes at relatively high (monthly-to-seasonal) temporal resolutions to achieve accurate estimates of Greenland MB.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Schlegel, N.
Wiese, D.
Larour, E.
Watkins, M.
Box, J.
Fettweis, Xavier ; Université de Liège > Département de géographie > Climatologie et Topoclimatologie
van den Broeke, M.
Language :
English
Title :
Application of GRACE to the assessment of model-based estimates of monthly Greenland Ice Sheet mass balance (2003–2012)
Publication date :
07 September 2016
Journal title :
The Cryosphere
ISSN :
1994-0416
eISSN :
1994-0424
Publisher :
Copernicus, Katlenberg-Lindau, Germany
Volume :
10
Pages :
1965-1989
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
A, G., Wahr, J., and Zhong, S. Computations of the viscoelastic response of a 3-D compressible Earth to surface loading: an application to Glacial Isostatic Adjustment in Antarctica, and Canada. Geophy. J. Int., 192, 557-572, doi: 10.1093/gji/ggs030, 2013
Aoalgeirsdóttir, G., Aschwanden, A., Khroulev, C., Boberg, F., Mottram, R., Lucas-Picher, P., and Christensen, J. H. Role of model initialization for projections of 21st-century Greenland ice sheet mass loss. J. Glaciol., 60, 782-794, doi: 10.3189/2014jog13j202, 2014
Aschwanden, A., Aoalgeirsdóttir, G., and Khroulev, C. Hindcasting to measure ice sheet model sensitivity to inital states. The Cryosphere, 7, 1083-1093, doi: 10.5194/tc-7-1083-2013, 2013
Aschwanden, A., Fahnestock, M., and Truffer, M. Complex Greenland outlet glacier flow captured. Nat. Commun., 7, 10524, doi: 10.1038/ncomms10524, 2016
Bartholomew, I., Nienow, P., Sole, A., Mair, D., Cowton, T., and King, M. A. Short-term variability in Greenland Ice Sheet motion forced by time-varying meltwater drainage: Implications for the relationship between subglacial drainage system behavior, and ice velocity. J. Geophys. Res.-Ea. Surf., 117, F03002, doi: 10.1029/2011JF002220, 2012
Baur, O., Kuhn, M., and Featherstone, W. E. GRACEderived ice-mass variations over Greenland by accounting for leakage effects. J. Geophys. Res.-Solid Ea., 114, B06407, doi: 10.1029/2008JB006239, 2009
Bell, R. E., Tinto, K., Das, I.and Wolovick, M., Chu, W., Creyts, T. T., Frearson, N., Abdi, A., and Paden, J. D. Deformation. warming, and softening of Greenland?s ice by refreezing meltwater, Nat. Geosci., 7, 497-502, doi: 10.1038/ngeo2179, 2014
Blatter, H. Velocity, and Stress-Fields in Grounded Glaciers: A Simple Algorithm for Including Deviatoric Stress Gradients. J. Glaciol., 41, 333-344, 1995
Box, J. E. Greenland Ice Sheet Mass Balance Reconstruction. Part II: Surface Mass Balance (1840-2010). J. Climate, 26, 6974-6989, doi: 10.1175/JCLI-D-12-00518.1, 2013
Carr, J. R., Stokes, C. R., and Vieli, A. Recent progress in understanding marine-terminating Arctic outlet glacier response to climatic, and oceanic forcing: Twenty years of rapid change. Prog. Phys. Geogr., 37, 436-467, doi: 10.1177/0309133313483163, 2013
Chauche, N., Hubbard, A., Gascard, J.-C., Box, J. E., Bates, R., Koppes, M., Sole, A., Christoffersen, P., and Patton, H. Ice-Ocean interaction, and calving front morphology at two west Greenland tidewater outlet glaciers. The Cryosphere, 8, 1457-1468, doi: 10.5194/tc-8-1457-2014, 2014
Chen, J. L., Wilson, C. R., and Tapley, B. D. Interannual variability of Greenland ice losses from satellite gravimetry. J. Geophys. Res.-Solid Ea., 116, 1-11, doi: 10.1029/2010JB007789, 2011
Cheng, M., and Tapley, B. Variations in the Earth?s oblateness during the past 28 years. J. Geophys. Res.-Solid Ea., 109, B09402, doi: 10.1029/2004JB003028, 2004
Church, J. A., and White, N. J. A 20th century acceleration in global sea-level rise. Geophys. Res. Lett., 33, L01602, doi: 10.1029/2005GL024826, 2006
Church, J. A., and White, N. J. Sea-Level Rise from the Late 19th to the Early 21st Century. Surv. Geophys., 32, 585-602, doi: 10.1007/s10712-011-9119-1, 2011
Colgan, W., Box, J. E., Andersen, M. L., Fettweis, X., Csatho, B., Faust, R. S., Van As, D., and Wahr, J. Greenland highelevation mass balance: inference, and implication of reference period (1961-90) imbalance. Ann. Glaciol. 56, 105-117, doi: 10.3189/2015AoG70A967, 2015
Csatho, B. M., Schenk, A. F., van Der Veen, C. J., Babonis, G., Duncan, K., Rezvanbehbahani, S., van den Broeke, M. R., Simonsen, S. B., Nagarajan, S., and van Angelen, J. H. Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics. P. Natl. Acad. Sci. USA, 111, 18478-18483, doi: 10.1073/pnas.1411680112, 2014
Enderlin, E. M., Howat, I. M., Jeong, S., Noh, M.-J., van Angelen, J. H., and van den Broeke, M. R. An improved mass budget for the Greenland ice sheet. Geophys. Res. Lett., 41, 866-872, doi: 10.1002/2013GL059010, 2014
Ettema, J., van den Broeke, M. R., van Meijgaard, E., van de Berg, W. J., Bamber, J. L., Box, J. E., and Bales, R. C. Higher surface mass balance of the Greenland Ice Sheet revealed by high-resolution climate modeling. Geophys. Res. Lett., 36, 1-5, doi: 10.1029/2009GL038110., 2009
Fagiolini, E., Flechtner, F., Horwath, M., and Dobslaw, H. Correction of inconsistencies in ECMWF?s operational analysis data during de-aliasing of GRACE gravity models. Geophy. J. Int., 202, 2150-2158, doi: 10.1093/gji/ggv276, 2015
Fausto, R., Ahlstrom, A., Van As, D., Johnsen, S., Langen, P., and Steffen, K. Improving surface boundary conditions with focus on coupling snow densification, and meltwater retention in large scale ice-sheet models of Greenland. J. Glaciol., 55, 869-878, 2009
Fettweis, X., Gallee, H., Lefebre, F., and van Ypersele, J. Greenland surface mass balance simulated by a regional climate model, and comparison with satellite-derived data in 1990-1991. Clim. Dynam., 24, 623-640, doi: 10.1007/s00382-005-0010-y, 2005
Fettweis, X., Tedesco, M., van den Broeke, M., and Ettema, J. Melting trends over the Greenland ice sheet (1958-2009) from spaceborne microwave data, and regional climate models. The Cryosphere, 5, 359-375, doi: 10.5194/tc-5-359-2011, 2011
Fettweis, X., Franco, B., Tedesco, M., van Angelen, J. H., Lenaerts, J. T. M., van den Broeke, M. R., and Gallée, H. Estimating the Greenland ice sheet surface mass balance contribution to future sea level rise using the regional atmospheric climate model MAR. The Cryosphere, 7, 469-489, doi: 10.5194/tc-7-469-2013, 2013
Fürst, J. J., Goelzer, H., and Huybrechts, P. Ice-dynamic projections of the Greenland ice sheet in response to atmospheric, and oceanic warming. The Cryosphere, 9, 1039-1062, doi: 10.5194/tc-9-1039-2015, 2015
Gallée, H., and Schayes, G. Development of a 3-dimensional Meso-Gamma primitive Equation Model -Katabatic Winds simulation in the area of Terra-Nova Bay Antarctica. Mon. Weather Rev., 122, 671-685, doi: 10.1175/1520-0493(1994)1222.0.CO; 2, 1994
Gardner, A. S., Moholdt, G., Cogley, J. G., Wouters, B., Arendt, A. A., Wahr, J., Berthier, E., Hock, R., Pfeffer, W. T., Kaser, G., Ligtenberg, S. R. M., Bolch, T., Sharp, M. J., Hagen, J. O., van den Broeke, M. R., and Paul, F. A reconciled estimate of glacier contributions to sea level rise: 2003 to 2009. Science, 340, 852-857, doi: 10.1126/science.1234532, 2013
Gillet-Chaulet, F., Gagliardini, O., Seddik, H., Nodet, M., Durand, G., Ritz, C., Zwinger, T., Greve, R., and Vaughan, D. Greenland Ice Sheet contribution to sea-level rise from a new-generation ice-sheet model. The Cryosphere, 6, 1561-1576, doi: 10.5194/tc-6-1561-2012, 2012
Goelzer, H., Huybrechts, P., Fürst, J. J., Nick, F. M., Andersen, M. L., Edwards, T. L., Fettweis, X., Payne, A. J., and Shannon, S. Sensitivity of Greenland ice sheet projections to model formulations. J. Glaciol., 59, 733-749, doi: 10.3189/2013JoG12J182, 2013
Gogineni, P. CReSIS RDS Data. http://data.cresis.ku.edu/, last access: 22 June 2012
Greve, R., and Herzfeld, U. C. Resolution of ice streams, and outlet glaciers in large-scale simulations of the Greenland ice sheet. Ann. Glaciol., 54, 209-220, doi: 10.3189/2013AoG63A085, 2013
Hanna, E., Huybrechts, P., Steffen, K., Cappelen, J., Huff, R., Shuman, C., Irvine-Fynn, T., Wise, S., and Griffiths, M. Increased Runoff from Melt from the Greenland Ice Sheet: A Response to Global Warming. J. Clim., 21, 331-341, Doi: 10.1175/2007JCLI1964.1, 2008
Hewitt, I. J. Seasonal changes in ice sheet motion due to melt water lubrication. Earth Planet. Sc. Lett., 371-372, 16-25, doi: 10.1016/j.epsl.2013.04.022, 2013
Hindmarsh, R. A numerical comparison of approximations to the Stokes equations used in ice sheet, and glacier modeling. J. Geophys. Res., 109, 1-15, doi: 10.1029/2003JF000065, 2004
Holland, D., Thomas, R., De Young, B., Ribergaard, M., and Lyberth, B. Acceleration of Jakobshavn Isbrae triggered by warm subsurface Ocean waters. Nat. Geosci., 1, 659-664, doi: 10.1038/ngeo316, 2008
Howat, I. M., Joughin, I., and Scambos, T. Rapid changes in ice discharge from Greenland outlet glaciers. Science, 315, 1559-1561, doi: 10.1126/science.1138478, 2007
Howat, I. M., Negrete, A., and Smith, B. E. The Greenland Ice Mapping Project (GIMP) land classification, and surface elevation datasets. The Cryosphere, 8, 1509-1518, doi: 10.5194/tc-8-1509-2014, 2014
Huybrechts, P. The present evolution of the Greenland ice-sheet -an assessment by modeling. Global Planet. Change, 9, 39-51, doi: 10.1016/0921-8181(94)90006-X, 1994
Huybrechts, P. Sea-level changes at the LGM from ice-dynamic reconstructions of the Greenland, and Antarctic ice sheets during the glacial cycles. Quaternary Sci. Rev., 21, 203-231, 2002
Jacob, T., Wahr, J., Pfeffer, W. T., and Swenson, S. Recent contributions of glaciers, and ice caps to sea level rise. Nature, 482, 514-518, doi: 10.1038/nature10847, 2012
Joughin, I., Howat, I., Alley, R. B., Ekstrom, G., Fahnestock, M., Moon, T., Nettles, M., Truffer, M., and Tsai, V. C. Icefront variation, and tidewater behavior on Helheim, and Kangerdlugssuaq Glaciers. Greenland, J. Geophys. Res., 113, 1-11, doi: 10.1029/2007JF000837, 2008
Joughin, I., Das, S. B., Flowers, G. E., Behn, M. D., Alley, R. B., King, M. A., Smith, B. E., Bamber, J. L., van den Broeke, M. R., and van Angelen, J. H. Influence of ice-sheet geometry, and supraglacial lakes on seasonal ice-flow variability. The Cryosphere, 7, 1185-1192, doi: 10.5194/tc-7-1185-2013, 2013
Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., Iredell, M., Saha, S., White, G., Woollen, J., Zhu, Y., Chelliah, M., Ebisuzaki, W., Higgins, W., Janowiak, J., Mo, K., Ropelewski, C., Wang, J., Leetmaa, A., Reynolds, R., Jenne, R., and Joseph, D. The NCEP/NCAR 40-year reanalysis project. B. Am. Meteorol. Soc., 77, 437-471, doi: 10.1175/1520-0477(1996)0772.0.CO; 2, 1996
Khan, S. A., Kjaer, K. H., Bevis, M., Bamber, J. L., Wahr, J., Kjeldsen, K. K., Bjork, A. A., Korsgaard, N. J., Stearns, L. A., van den Broeke, M. R., Liu, L., Larsen, N. K., and Muresan, I. S. Sustained mass loss of the northeast Greenland ice sheet triggered by regional warming. Nat. Clim. Change, 4, 292-299, doi: 10.1038/NCLIMATE2161, 2014
Khan, S. A., Aschwanden, A., Bjork, A. A., Wahr, J., Kjeldsen, K. K., and Kjaer, K. H. Greenland ice sheet mass balance: a review. Rep. Prog. Phys., 78, 1-26, doi: 10.1088/0034-4885/78/4/046801, 2015
Kjær, K. H., Khan, S. A., Korsgaard, N. J., Wahr, J., Bamber, J. L., Hurkmans, R., van den Broeke, M., Timm, L. H., Kjeldsen, K. K., Bjork, A. A., Larsen, N. K., Jorgensen, L. T., Faerch-Jensen, A., and Willerslev, E. Aerial Photographs Reveal Late-20th-Century Dynamic Ice Loss in Northwestern Greenland. Science, 337, 569-573, doi: 10.1126/science.1220614, 2012
Krabill, W., Abdalati, W., Frederick, E., Manizade, S., Martin, C., Sonntag, J., Swift, R., Thomas, R., Wright, W., and Yungel, J. Greenland ice sheet: High-elevation balance, and peripheral thinning. Science, 289, 428-430, doi: 10.1126/science.289.5478.428, 2000
Landerer, F.W., Wiese, D. N., Bentel, K., Boening, C., andWatkins, M. M. North Atlantic meridional overturning circulation variations from GRACE Ocean bottom pressure anomalies. Geophys. Res. Lett., 42, 8114-8121, doi: 10.1002/2015GL065730, 2015
Larour, E., Seroussi, H., Morlighem, M., and Rignot, E. Continental scale. high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM), J. Geophys. Res., 117, 1-20, doi: 10.1029/2011JF002140, 2012
Lucas-Picher, P., Wulff-Nielsen, M., Christensen, J. H., Aoalgeirsdóttir, G., Mottram, R., and Simonsen, S. B. Very high resolution regional climate model simulations over Greenland: Identifying added value. J. Geophys. Res., 117, D02108, doi: 10.1029/2011JD016267, 2012
Luthcke, S. B., Zwally, H. J., Abdalati, W., Rowlands, D. D., Ray, R. D., Nerem, R. S., Lemoine, F. G., McCarthy, J. J., and Chinn, D. S. Recent Greenland ice mass loss by drainage system from satellite gravity observations. Science, 314, 1286-1289, doi: 10.1126/science.1130776, 2006
Luthcke, S. B., Sabaka, T. J., Loomis, B. D., Arendt, A. A., McCarthy, J. J., and Camp, J. Antarctica. Greenland, and Gulf of Alaska land-ice evolution from an iterated GRACE global mascon solution, J. Glaciol., 59, 613-631, doi: 10.3189/2013JoG12J147, 2013
MacAyeal, D. Binge/Purge oscillations of the Laurentide ice-sheet as a cause of the North-Atlantic?s Heinrich events. Paleoceanography, 8, 775-784, 1993
MacGregor, J. A., Colgan, W. T., Fahnestock, M. A., Morlighem, M., Catania, G. A., Paden, J. D., and Gogineni, S. P. Holocene deceleration of the Greenland Ice Sheet. Science, 351, 590-593, doi: 10.1126/science.aab1702, 2016
Moon, T., Joughin, I., Smith, B., and Howat, I. 21st-Century Evolution of Greenland Outlet Glacier Velocities. Science, 336, 576-578, doi: 10.1126/science.1219985, 2012
Moon, T., Joughin, I., Smith, B., van den Broeke, M. R., van de Berg, W. J., Noel, B., and Usher, M. Distinct patterns of seasonal Greenland glacier velocity. Geophys. Res. Lett., 41, 7209-7216, doi: 10.1002/2014GL061836, 2014
Morlighem, M., Rignot, E., Seroussi, H., Larour, E., Ben Dhia, H., and Aubry, D. Spatial patterns of basal drag inferred using control methods from a full-Stokes, and simpler models for Pine Island Glacier. West Antarctica, Geophys. Res. Lett., 37, 1-6, doi: 10.1029/2010GL043853, 2010
Morlighem, M., Rignot, E., Mouginot, J., Seroussi, H., and Larour, E. High-resolution ice thickness mapping in South Greenland. Ann. Glaciol., 55, 64-70, doi: 10.3189/2014AoG67A088, 2014a
Morlighem, M., Rignot, E., Mouginot, J., Seroussi, H., and Larour, E. Deeply incised submarine glacial valleys beneath the Greenland Ice Sheet. Nat. Geosci., 7, 418-422, doi: 10.1038/ngeo2167, 2014b
Nick, F. M., van Der Veen, C. J., Vieli, A., and Benn, D. I. A physically based calving model applied to marine outlet glaciers, and implications for the glacier dynamics. J. Glaciol., 56, 781-794, 2010
Nick, F. M., Vieli, A., Andersen, M. L., Joughin, I., Payne, A., Edwards, T. L., Pattyn, F., and van deWal, R. S.W. Future sea-level rise from Greenland?s main outlet glaciers in a warming climate. Nature, 497, 235-238, 2013
Noël, B., van de Berg, W. J., van Meijgaard, E., Kuipers Munneke, P., van de Wal, R. S. W., and van den Broeke, M. R. Evaluation of the updated regional climate model RACMO2.3: summer snowfall impact on the Greenland Ice Sheet. The Cryosphere, 9, 1831-1844, doi: 10.5194/tc-9-1831-2015, 2015
Nowicki, S., Bindschadler, R., Abe-Ouchi, A., Aschwanden, A., Bueler, E., Choi, H., Fastook, J., Granzow, G., Greve, R., Gutowski, G., Herzfeld, U., Jackson, C., Johnson, J., Khroulev, C., Larour, E., Levermann, A., Lipscomb, W., Martin, M., Morlighem, M., Parizek, B., Pollard, D., Price, S., Ren, D., Rignot, E., Saito, F., Sato, T., Seddik, H., Seroussi, H., Takahashi, K., Walker, R., and Wang, W. Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project II: Greenland. J. Geophys. Res., 118, 1-20, doi: 10.1002/jgrf.20076, 2013
Pachauri, R. K., Allen, M. R., Barros, V. R., Broome, J., Cramer, W., Christ, R., Church, J. A., Clarke, L., Dahe, Q., Dasgupta, P., Dubash, N. K., Edenhofer, O., Elgizouli, I., Field, C. B., Forster, P., Friedlingstein, P., Fuglestvedt, J., Gomez-Echeverri, L., Hallegatte, S., Hegerl, G., Howden, M., Jiang, K., Jimenez Cisneroz, B., Kattsov, V., Lee, H., Mach, K. J., Marotzke, J., Mastrandrea, M. D., Meyer, L., Minx, J., Mulugetta, Y., O?Brien, K., Oppenheimer, M., Pereira, J. J., Pichs-Madruga, R., Plattner, G. K., Pörtner, H.-O., Power, S. B., Preston, B., Ravindranath, N. H., Reisinger, A., Riahi, K., Rusticucci, M., Scholes, R., Seyboth, K., Sokona, Y., Stavins, R., Stocker, T. F., Tschakert, P., van Vuuren, D., and van Ypserle, J. P. Climate Change 2014: Synthesis Report. in: Contribution of Working Groups I, II, and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, EPIC3Geneva, IPCC, Switzerland, 151 pp., http://epic.awi.de/37530/(last access: 9 June 2015), 2014
Paterson, W., and Reeh, N. Thinning of the ice sheet in northwest Greenland over the past forty years. Nature, 414, 60-62, doi: 10.1038/35102044, 2001
Pattyn, F. A new three-dimensional higher-order thermomechanical ice sheet model: Basic sensitivity. ice stream development, and ice flow across subglacial lakes, J. Geophys. Res., 108, 1-15, doi: 10.1029/2002JB002329, 2003
Paulson, A., Zhong, S., and Wahr, J. Inference of mantle viscosity from GRACE, and relative sea level data. Geophy. J. Int., 171, 497-508, doi: 10.1111/j.1365-246X.2007.03556.x, 2007
Peltier, W. R., Argus, D. F., and Drummond, R. Space geodesy constrains ice age terminal deglaciation: The global ICE-6GC (VM5a) model. J. Geophys. Res.-Solid Ea., 120, 450-487, doi: 10.1002/2014JB011176, 2015
Perego, M., Gunzburger, M., and Burkardt, J. Parallel finiteelement implementation for higher-order ice-sheet models. J. Glaciol., 58, 76-88, doi: 10.3189/2012JoG11J063, 2012
Pfeffer, W., Illangasekare, T., and Meier, M. Analysis, and modeling of melt-water refreezing in dry snow. J. Glaciol., 36, 238-246, 1990
Pfeffer, W., Meier, M., and Illangasekare, T. Retention of Greenland Runoff by Refreezing: Implications for Projected Future Sea-Level Rise. J. Geophys. Res.-Oceans, 96, 22117-22124, doi: 10.1029/91JC02502, 1991
Phillips, T., Rajaram, H., and Steffen, K. Cryo-hydrologic warming: A potential mechanism for rapid thermal response of ice sheets. Geophys. Res. Lett., 7, 1-5, doi: 10.1029/2010GL044397, 2010
Phillips, T., Rajaram, H., Colgan, W., Steffen, K., and Abdalati, W. Evaluation of cryo-hydrologic warming as an explanation for in creased ice velocities in the wet snow zone. Sermeq Avannarleq, West Greenland, J. Geophys. Res.-Ea. Surf., 118, 1241-1256, doi: 10.1002/jgrf.20079, 2013
Price, S., Payne, A., Howat, I., and Smith, B. Committed sea-level rise for the next century from Greenland ice sheet dynamics during the past decade. P. Natl. Acad. Sci. USA, 108, 8978-8983, 2011
Pritchard, H., Arthern, R., Vaughan, D., and Edwards, L. Extensive dynamic thinning on the margins of the Greenland, and Antarctic ice sheets. Nature, 461, 971-975, doi: 10.1038/nature08471, 2009
Rae, J. G. L., Aoalgeirsdóttir, G., Edwards, T. L., Fettweis, X., Gregory, J. M., Hewitt, H. T., Lowe, J. A., Lucas-Picher, P., Mottram, R. H., Payne, A. J., Ridley, J. K., Shannon, S. R., van de Berg, W. J., van de Wal, R. S. W., and van den Broeke, M. R. Greenland ice sheet surface mass balance: evaluating simulations, and making projections with regional climate models. The Cryosphere, 6, 1275-1294, doi: 10.5194/tc-6-1275-2012, 2012
Reeh, N. Was the Greenland ice-sheet thinner in the late Wisconsinan than now. Nature, 317, 797-799, doi: 10.1038/317797a0, 1985
Reeh, N., Thomsen, H., Higgins, A., and Weidick, A. Sea ice, and the stability of north, and northeast Greenland floating glaciers. Ann. Glaciol., 33, 474-480, doi: 10.3189/172756401781818554, 2001
Rignot, E., and Mouginot, J. Ice flow in Greenland for the International Polar Year 2008-2009. Geophys. Res. Lett., 39, L11501, doi: 10.1029/2012GL051634, 2012
Rignot, E., Box, J. E., Burgess, E., and Hanna, E. Mass balance of the Greenland ice sheet from 1958 to 2007. Geophys. Res. Lett., 35, 1-5, doi: 10.1029/2008GL035417, 2008
Rignot, E., Koppes, M., and Velicogna, I. Rapid submarine melting of the calving faces of West Greenland glaciers. Nat. Geosci., 3, 187-191, doi: 10.1038/NGEO765, 2010
Rignot, E., Velicogna, I., van den Broeke, M., Monaghan, A., and Lenaerts, J. Acceleration of the contribution of the Greenland, and Antarctic ice sheets to sea level rise. Geophys. Res. Lett., 38, 1-5, doi: 10.1029/2011GL046583, 2011
Rogozhina, I., Martinec, Z., Hagedoorn, J. M., Thomas, M., and Fleming, K. On the long-term memory of the Greenland Ice Sheet. J. Geophys. Res.-Ea. Surf., 116, 1-16, doi: 10.1029/2010JF001787, 2011
Saito, F., Abe-Ouchi, A., Takahashi, K., and Blatter, H. SeaRISE experiments revisited: potential sources of spread in multi-model projections of the Greenland ice sheet. The Cryosphere, 10, 43-63, doi: 10.5194/tc-10-43-2016, 2016
Sasgen, I., van den Broeke, M., Bamber, J. L., Rignot, E., Sorensen, L. S., Wouters, B., Martinec, Z., Velicogna, I., and Simonsen, S. B. Timing, and origin of recent regional icemass loss in Greenland. Earth Planet. Sc. Lett., 333, 293-303, doi: 10.1016/j.epsl.2012.03.033, 2012
Scambos, T., and Haran, T. An image-enhanced DEM of the Greenland ice sheet. Ann. Glaciol., 34, 291-298, doi: 10.3189/172756402781817969, 2002
Schild, K. M., and Hamilton, G. S. Seasonal variations of outlet glacier terminus position in Greenland. J. Glaciol., 59, 759-770, doi: 10.3189/2013JoG12J238, 2013
Schlegel, N.-J., Larour, E., Seroussi, H., Morlighem, M., and Box, J. E. Decadal-scale sensitivity of Northeast Greenland ice flow to errors in surface mass balance using ISSM. J. Geophys. Res.-Ea. Surf., 118, 1-14, doi: 10.1002/jgrf.20062, 2013
Schlegel, N.-J., Larour, E., Seroussi, H., Morlighem, M., and Box, J. E. Ice discharge uncertainties in Northeast Greenland from boundary conditions, and climate forcing of an ice flow model. J. Geophys. Res.-Ea. Surf., 120, 29-54, doi: 10.1002/2014JF003359, 2015
Schoof, C. Coulomb Friction, and Other Sliding Laws In A Higherorder Glacier Flow Model. Math. Models Methods Appl. Sci., 20, 157-189, doi: 10.1142/S0218202510004180, 2010
Schoof, C., and Hindmarsh, R. C. A. Thin-Film Flows with Wall Slip: An Asymptotic Analysis of Higher Order Glacier Flow Models. Quart. J. Mech. Appl. Math., 63, 73-114, doi: 10.1093/qjmam/hbp025, 2010
Schrama, E. J. O., and Wouters, B. Revisiting Greenland ice sheet mass loss observed by GRACE. J. Geophys. Res.-Solid Ea., 116, 1-10, doi: 10.1029/2009JB006847, 2011
Schrama, E. J. O., Wouters, B., and Rietbroek, R. A mascon approach to assess ice sheet, and glacier mass balances, and their uncertainties from GRACE data. J. Geophys. Res.-Ea. Surf., 119, 6048-6066, doi: 10.1002/2013JB010923, 2014
Seroussi, H., Morlighem, M., Rignot, E., Khazendar, A., Larour, E., and Mouginot, J. Dependence of century-scale projections of the Greenland ice sheet on its thermal regime. J. Glaciol., 59, 1024-1034, doi: 10.3189/2013JoG13J054, 2013
Shapiro, N., and Ritzwoller, M. Inferring surface heat flux distributions guided by a global seismic model: particular application to Antarctica. Earth Planet. Sc. Lett., 223, 213-224, doi: 10.1016/j.epsl.2004.04.011, 2004
Shepherd, A., and Wingham, D. Recent sea-level contributions of the Antarctic, and Greenland ice sheets. Science, 315, 1529-1532, doi: 10.1126/science.1136776, 2007
Shepherd, A., Ivins, E., A, G., Barletta, V., Bentley, M., Bettadpur, S., Briggs, K., Bromwich, D., Forsberg, R., Galin, N., Horwath, M., Jacobs, S., Joughin, I., King, M., Lenaerts, J., Li, J., Ligtenberg, S., Luckman, A., Luthcke, S., McMillan, M., Meister, R., Milne, G., Mouginot, J., Muir, A., Nicolas, J., Paden, J., Payne, A., Pritchard, H., Rignot, E., Rott, H., Sorensen, L., Scambos, T., Scheuchl, B., Schrama, E., Smith, B., Sundal, A., van Angelen, J., van de Berg, W., van den Broeke, M., Vaughan, D., Velicogna, I., Wahr, J., Whitehouse, P., Wingham, D., Yi, D., Young, D., and Zwally, H. A Reconciled Estimate of Ice-Sheet Mass Balance. Science, 338, 1183-1189, doi: 10.1126/science.1228102, 2012
Simpson, M. J. R., Milne, G. A., Huybrechts, P., and Long, A. J. Calibrating a glaciological model of the Greenland ice sheet from the Last Glacial Maximum to present-day using field observations of relative sea level, and ice extent. Quaternary Sci. Rev., 28, 1631-1657, doi: 10.1016/j.quascirev.2009.03.004, 2009
Swenson, S., Chambers, D., and Wahr, J. Estimating geocenter variations from a combination of GRACE, and Ocean model output. J. Geophys. Res.-Solid Ea., 113, B08410, doi: 10.1029/2007JB005338, 2008
Tedesco, M., Luthje, M., Steffen, K., Steiner, N., Fettweis, X., Willis, I., Bayou, N., and Banwell, A. Measurement, and modeling of ablation of the bottom of supraglacial lakes in western Greenland. Geophys. Res. Lett., 39, L02502, doi: 10.1029/2011GL049882, 2012
Tedstone, A. J., Nienow, P. W., Gourmelen, N., Dehecq, A., Goldberg, D., and Hanna, E. Decadal slowdown of a land-terminating sector of the Greenland Ice Sheet despite warming. Nature, 526, 692-695, doi: 10.1038/nature15722, 2015
Uppala, S., Kallberg, P., Simmons, A., Andrae, U., Bechtold, V., Fiorino, M., Gibson, J., Haseler, J., Hernandez, A., Kelly, G., Li, X., Onogi, K., Saarinen, S., Sokka, N., Allan, R., Andersson, E., Arpe, K., Balmaseda, M., Beljaars, A., Van De Berg, L., Bidlot, J., Bormann, N., Caires, S., Chevallier, F., Dethof, A., Dragosavac, M., Fisher, M., Fuentes, M., Hagemann, S., Holm, E., Hoskins, B., Isaksen, L., Janssen, P., Jenne, R., McNally, A., Mahfouf, J., Morcrette, J., Rayner, N., Saunders, R., Simon, P., Sterl, A., Trenberth, K., Untch, A., Vasiljevic, D., Viterbo, P., and Woollen, J. The ERA-40 re-analysis. Q. J. Roy. Meteorol. Soc., 131, 2961-3012, doi: 10.1256/qj.04.176, 2005
van Angelen, J. H., van den Broeke, M. R., and van de Berg, W. J. Momentum budget of the atmospheric boundary layer over the Greenland ice sheet, and its surrounding seas. J. Geophys. Res.-Atmos., 116, 1-14, doi: 10.1029/2010JD015485, 2011
van den Broeke, M., Bamber, J., Ettema, J., Rignot, E., Schrama, E., van de Berg, W. J., van Meijgaard, E., Velicogna, I., andWouters, B. Partitioning Recent Greenland Mass Loss. Science, 326, 984-986, doi: 10.1126/science.1178176, 2009
van Meijgaard, E., van Ulft, L. H., Van de Berg, W. J., Bosvelt, F. C., Van den Hurk, B. J. J. M., Lenderink, G., and Siebesma, A. P. The KNMI regional atmospheric model RACMO version 2.1. Technical Report 302, Tech. rep., KNMI, De Bilt, the Netherlands, 2008
Velicogna, I. Increasing rates of ice mass loss from the Greenland, and Antarctic ice sheets revealed by GRACE. Geophys. Res. Lett., 36, 1-4, doi: 10.1029/2009GL040222, 2009
Velicogna, I., and Wahr, J. Time-variable gravity observations of ice sheet mass balance: Precision, and limitations of the GRACE satellite data. Geophys. Res. Lett., 40, 3055-3063, doi: 10.1002/grl.50527, 2013
Velicogna, I., Sutterley, T. C., and van den Broeke, M. R. Regional acceleration in ice mass loss from Greenland, and Antarctica using GRACE time-variable gravity data. Geophys. Res. Lett., 41, 8130-8137, doi: 10.1002/2014GL061052, 2014
Vernon, C. L., Bamber, J. L., Box, J. E., van den Broeke, M. R., Fettweis, X., Hanna, E., and Huybrechts, P. Surface mass balance model intercomparison for the Greenland ice sheet. Cryosphere, 7, 599-614, doi: 10.5194/tc-7-599-2013, 2013
Wahr, J., Nerem, R. S., and Bettadpur, S. V. The pole tide, and its effect on GRACE time-variable gravity measurements: Implications for estimates of surface mass variations. J. Geophys. Res.-Solid Ea., 120, 4597-4615, doi: 10.1002/2015JB011986, 2015
Walter, J. I., Box, J. E., Tulaczyk, S., Brodsky, E. E., Howat, I. M., Ahn, Y., and Brown, A. Oceanic mechanical forcing of a marine-terminating Greenland glacier. Ann. Glaciol., 53, 181-192, doi: 10.3189/2012AoG60A083, 2012
Watkins, M. M., Wiese, D. N., Yuan, D.-N., Boening, C., and Landerer, F. W. Improved methods for observing Earth?s time variable mass distribution with GRACE using spherical cap mascons. J. Geophys. Res.-Solid Ea., 120, 2648-2671, doi: 10.1002/2014JB011547, 2015
Wiese, D. N., Yuan, D.-N., Boening, C., Landerer, F. W., and Watkins, M. M. JPL GRACE Mascon Ocean. Ice, and Hydrology Equivalent Water Height RL05M.1 CRI Filtered, Ver. 2, PO.DAAC, CA, USA, doi: 10.5067/TEMSC-OLCR5, 2015
Willis, M. J., Herried, B. G., Bevis, M. G., and Bell, R. E. Recharge of a subglacial lake by surface meltwater in northeast Greenland. Nature, 518, 223-227, doi: 10.1038/nature14116, 2015
Wu, G., Yao, T., Xu, B., Tian, L., Zhang, C., and Zhang, X. Volume-size distribution of microparticles in ice cores from the Tibetan Plateau. J. Glaciol., 55, 859-868, 2009
Wu, X., Watkins, M., Ivins, E., Kwok, R., Wang, P., and Wahr, J. Toward global inverse solutions for current, and past ice mass variations: Contribution of secular satellite gravity, and topography change measurements. J. Geophys. Res.-Solid Ea., 107, 1-8, doi: 10.1029/2001JB000543, 2002
Yan, Q., Zhang, Z., Gao, Y., Wang, H., and Johannessen, O. M. Sensitivity of the modeled present-day Greenland Ice Sheet to climatic forcing, and spin-up methods, and its influence on future sea level projections. J. Geophys. Res.-Ea. Surf., 118, 2174-2189, doi: 10.1002/jgrf.20156, 2013
Yoshimori, M., and Abe-Ouchi, A. Sources of Spread in Multimodel Projections of the Greenland Ice Sheet Surface Mass Balance. J. Climate, 25, 1157-1175, doi: 10.1175/2011JCLI4011.1, 2012
Zwally, H. J., Li, J., Brenner, A. C., Beckley, M., Cornejo, H. G., Dimarzio, J., Giovinetto, M. B., Neumann, T. A., Robbins, J., Saba, J. L., Yi, D., and Wang, W. Greenland ice sheet mass balance: distribution of increased mass loss with climate warming; 2003-07 versus 1992-2002. J. Glaciol., 57, 88-102, 2011