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Decadal slowdown of a land-terminating sector of the Greenland Ice Sheet despite warming


Ice flow along land-terminating margins of the Greenland Ice Sheet (GIS) varies considerably in response to fluctuating inputs of surface meltwater to the bed of the ice sheet. Such inputs lubricate the ice–bed interface, transiently speeding up the flow of ice1,2. Greater melting results in faster ice motion during summer, but slower motion over the subsequent winter, owing to the evolution of an efficient drainage system that enables water to drain from regions of the ice-sheet bed that have a high basal water pressure2,3. However, the impact of hydrodynamic coupling on ice motion over decadal timescales remains poorly constrained. Here we show that annual ice motion across an 8,000-km2 land-terminating region of the west GIS margin, extending to 1,100 m above sea level, was 12% slower in 2007–14 compared with 1985–94, despite a 50% increase in surface meltwater production. Our findings suggest that, over these three decades, hydrodynamic coupling in this section of the ablation zone resulted in a net slowdown of ice motion (not a speed-up, as previously postulated1). Increases in meltwater production from projected climate warming may therefore further reduce the motion of land-terminating margins of the GIS. Our findings suggest that these sectors of the ice sheet are more resilient to the dynamic impacts of enhanced meltwater production than previously thought.

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Figure 1: Study area in the ablation zone of the western GIS.
Figure 2: Surface melting and ice motion averaged over the study area.
Figure 3: Ice velocities along three transects in the study area.

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  1. Zwally, H. J., Abdalati, W. & Herring, T. Surface melt-induced acceleration of Greenland ice-sheet flow. Science 297, 218–222 (2002)

    Article  ADS  CAS  Google Scholar 

  2. Sole, A. et al. Winter motion mediates dynamic response of the Greenland ice sheet to warmer summers. Geophys. Res. Lett. 40, 3940–3944 (2013)

    Article  ADS  Google Scholar 

  3. Tedstone, A. J. et al. Greenland ice sheet motion insensitive to exceptional meltwater forcing. Proc. Natl Acad. Sci. USA 110, 19719–19724 (2013)

    Article  ADS  CAS  Google Scholar 

  4. Shepherd, A. et al. A reconciled estimate of ice-sheet mass balance. Science 338, 1183–1189 (2012)

    Article  ADS  CAS  Google Scholar 

  5. Enderlin, E. M. et al. An improved mass budget for the Greenland ice sheet. Geophys. Res. Lett. 41, 866–872 (2014)

    Article  ADS  Google Scholar 

  6. Hanna, E. et al. Ice sheet mass balance and climate change. Nature 498, 51–59 (2013)

    Article  ADS  CAS  Google Scholar 

  7. Box, J. E., Yang, L., Bromwich, D. H. & Bai, L.-S. Greenland ice sheet surface air temperature variability: 1840–2007. J. Clim. 22, 4029–4049 (2009)

    Article  ADS  Google Scholar 

  8. Fettweis, X. et al. Important role of the mid-tropospheric atmospheric circulation in the recent surface melt increase over the Greenland ice sheet. Cryosphere 7, 241–248 (2013)

    Article  ADS  Google Scholar 

  9. Howat, I. M., Box, J. E., Ahn, Y., Herrington, A. & Mcfadden, E. M. Seasonal variability in the dynamics of marine-terminating outlet glaciers in Greenland. J. Glaciol. 56, 601–613 (2010)

    Article  ADS  Google Scholar 

  10. Das, S. B. et al. Fracture propagation to the base of the Greenland Ice Sheet during supraglacial lake drainage. Science 320, 778–81 (2008)

    Article  ADS  CAS  Google Scholar 

  11. Chandler, D. M. et al. Evolution of the subglacial drainage system beneath the Greenland Ice Sheet revealed by tracers. Nature Geosci. 6, 195–198 (2013)

    Article  ADS  CAS  Google Scholar 

  12. Andrews, L. C. et al. Direct observations of evolving subglacial drainage beneath the Greenland ice sheet. Nature 514, 80–83 (2014)

    Article  ADS  CAS  Google Scholar 

  13. Parizek, B. R. & Alley, R. B. Implications of increased Greenland surface melt under global-warming scenarios: ice-sheet simulations. Quat. Sci. Rev. 23, 1013–1027 (2004)

    Article  ADS  Google Scholar 

  14. Schoof, C. Ice-sheet acceleration driven by melt supply variability. Nature 468, 803–806 (2010)

    Article  ADS  CAS  Google Scholar 

  15. Bartholomew, I. et al. Seasonal variations in Greenland Ice Sheet motion: Inland extent and behaviour at higher elevations. Earth Planet. Sci. Lett. 307, 271–278 (2011)

    Article  ADS  CAS  Google Scholar 

  16. Cowton, T. et al. Evolution of drainage system morphology at a land-terminating Greenland outlet glacier. J. Geophys. Res. 118, 29–41 (2013)

    Article  Google Scholar 

  17. Röthlisberger, H. Water pressure in intra- and subglacial channels. J. Glaciol. 11, 177–203 (1972)

    Article  ADS  Google Scholar 

  18. Hoffman, M. & Price, S. Feedbacks between coupled subglacial hydrology and glacier dynamics. J. Geophys. Res. Earth Surf. 119, 414–436 (2014)

    Article  ADS  Google Scholar 

  19. van de Wal, R. S. W. et al. Large and rapid melt-induced velocity changes in the ablation zone of the Greenland ice sheet. Science 321, 111–113 (2008)

    Article  ADS  CAS  Google Scholar 

  20. van de Wal, R. S. W. et al. Self-regulation of ice flow varies across the ablation area in south-west Greenland. Cryosphere 9, 603–611 (2015)

    Article  ADS  Google Scholar 

  21. Doyle, S. H. et al. Persistent flow acceleration within the interior of the Greenland ice sheet. Geophys. Res. Lett. 41, 899–905 (2014)

    Article  ADS  Google Scholar 

  22. Shannon, S. R. et al. Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise. Proc. Natl Acad. Sci. USA 110, 14156–14161 (2013)

    Article  ADS  CAS  Google Scholar 

  23. Dehecq, A., Gourmelen, N. & Trouvé, E. Deriving large scale glacier velocities from a complete satellite archive: application to the Pamir-Karakoram-Himalaya. Remote Sens. Environ. 162, 55–66 (2015)

    Article  ADS  Google Scholar 

  24. Morlighem, M., Rignot, E., Mouginot, J., Seroussi, H. & Larour, E. Deeply incised submarine glacial valleys beneath the Greenland ice sheet. Nature Geosci. 7, 418–422 (2014)

    Article  ADS  CAS  Google Scholar 

  25. Sole, A., Payne, T., Bamber, J., Nienow, P. & Krabill, W. Testing hypotheses of the cause of peripheral thinning of the Greenland ice sheet: is land-terminating ice thinning at anomalously high rates? Cryosphere 2, 205–218 (2008)

    Article  ADS  Google Scholar 

  26. Pritchard, H. D., Arthern, R. J. & Vaughan, D. G. and Edwards, L. A. Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets. Nature 461, 971–975 (2009)

    Article  ADS  CAS  Google Scholar 

  27. Helm, V., Humbert, A. & Miller, H. Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2. Cryosphere 8, 1539–1559 (2014)

    Article  ADS  Google Scholar 

  28. Richards, K. et al. An integrated approach to modelling hydrology and water quality in glacierized catchments. Hydrol. Processes 10, 479–508 (1996)

    Article  ADS  Google Scholar 

  29. Hubbard, B., Sharp, M., Willis, I., Nielsen, M. & Smart, C. Borehole water-level variations and the structure of the subglacial hydrological system of Haut Glacier d’Arolla, Valais, Switzerland. J. Glaciol. 41, 572–583 (1995)

    Article  ADS  Google Scholar 

  30. Howat, I. M., Negrete, A. & Smith, B. E. The Greenland Ice Mapping Project (GIMP) land classification and surface elevation data sets. Cryosphere 8, 1509–1518 (2014)

    Article  ADS  Google Scholar 

  31. Joughin, I., Smith, B. E., Howat, I. M., Scambos, T. & Moon, T. Greenland flow variability from ice-sheet-wide velocity mapping. J. Glaciol. 56, 415–430 (2010)

    Article  ADS  Google Scholar 

  32. Krabill, W. et al. Greenland ice sheet: high-elevation balance and peripheral thinning. Science 289, 428–430 (2000)

    Article  ADS  CAS  Google Scholar 

  33. Cuffey, K. & Paterson, W. S. B. The Physics of Glaciers 3rd edn (Butterworth-Heinemann, 2010)

    Google Scholar 

  34. Weertman, J. On the sliding of glaciers. J. Glaciol. 3, 33–38 (1957)

    Article  ADS  Google Scholar 

  35. Alley, R. B., Blankenship, D. D., Rooney, S. T. & Bentley, C. R. Till beneath ice stream B: 4. A coupled ice-till flow model. J. Geophys. Res. Solid Earth 92, 8931–8940 (1987)

    Article  Google Scholar 

  36. van de Wal, R. S. W. et al. Twenty-one years of mass balance observations along the K-transect, West Greenland. Earth Syst. Sci. Data 4, 31–35 (2012)

    Article  ADS  Google Scholar 

  37. Phillips, T., Rajaram, H. & Steffen, K. Cryo-hydrologic warming: a potential mechanism for rapid thermal response of ice sheets. Geophys. Res. Lett. 37, L20503 (2010)

    Article  ADS  Google Scholar 

  38. Hanna, E. et al. Greenland ice sheet surface mass balance 1870 to 2010 based on twentieth century reanalysis, and links with global climate forcing. J. Geophys. Res. 116, D24121 (2011)

    Article  ADS  Google Scholar 

  39. Vernon, C. L. et al. Surface mass balance model intercomparison for the Greenland ice sheet. Cryosphere 7, 599–614 (2013)

    Article  ADS  Google Scholar 

  40. Janssens, I. and Huybrechts, P. The treatment of meltwater retention in mass-balance parameterizations of the Greenland ice sheet. Ann. Glaciol. 31, 133–140 (2000)

    Article  ADS  Google Scholar 

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A.J.T. acknowledges UK Natural Environment Research Council (NERC) studentships NE/152830X/1 and NE/J500021/1, a Scottish Alliance for Geoscience, Environment and Society (SAGES) Postdoctoral/Early Career Researcher Exchange (PECRE) award, and a University of Edinburgh GeoSciences Moss scholarship. N.G. acknowledges European Space Agency Dragon 3 grant 10302, the Centre National d’Etudes Spatiales Tosca CESTENG project, and a fellowship from the Centre National d’Etudes Spatiales to A.D. This work made use of the resources provided by the Edinburgh Compute and Data Facility (ECDF) ( We thank P. Huybrechts for his work on the runoff/retention model used in this study. The Landsat imagery was provided by the United States Geological Survey and the European Space Agency third party missions program.

Author information

Authors and Affiliations



A.J.T., P.W.N. and N.G. designed this study. A.D., N.G. and A.J.T. developed the processing chain used for feature tracking of Landsat imagery. A.J.T., A.D. and N.G. processed the Landsat imagery. A.J.T. and D.G. calculated the impact of changing ice geometry upon ice motion. E.H. processed the melt data. A.J.T., N.G. and P.W.N. analysed the results. A.J.T., P.W.N. and N.G. wrote the manuscript. All authors discussed the results and edited the manuscript.

Corresponding author

Correspondence to Andrew J. Tedstone.

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The authors declare no competing financial interests.

Extended data figures and tables

Extended Data Figure 1 Sensitivity of extracted ice motion to variations in baseline duration.

For each period are shown: a, the average start day-of-year (DOY) of all pairs used in the period; b, the average baseline duration of all pairs used in the period; c, the proportion of the baseline duration that is attributable to summer, which is defined as 1 May to 31 August; and d, the annual velocity that would be expected in the ablation zone of the Leverett glacier catchment, based on the average proportion of summer versus winter and the average baseline duration for each year.

Extended Data Figure 2 Statistical significance of three different periods of surface meltwater production.

Hypothesis test of the Wilcoxon rank sum test at 95% confidence (see Methods), showing that three periods of surface melt separated by the specified dates have statistically different medians (outlined white region). The colouring shows the residuals of a three-trend linear segmented regression model fitted to melting at each possible combination of two break dates, expressed as the root-mean-squared error. The grey area is shaded as such for simplicity; it would otherwise be a mirror image of the coloured area.

Extended Data Figure 3 Statistical significance of two different periods of ice motion.

a, Hypothesis test of the Wilcoxon rank sum test for equal medians, testing the probability that the two populations (separated by the specified date) are similar, with 95% confidence. 0 signifies that the hypothesis of equal medians cannot be rejected, and 1 signifies that the hypothesis of equal medians can be rejected. b, Residuals shown as the sum-of-squares (m yr−1)2 of a two-trend model fitted to velocities at each possible break date.

Extended Data Figure 4 Ice velocities during each period.

The velocities have uncertainties < 60 m yr−1 and were observed across at least 30% of the study area in each period (see Methods).

Extended Data Figure 5 Impact of changing ice geometry on ice motion.

Ice thinning of 10 m (purple) and 20 m (blue) at the ice margin, through to 0 m at 100 km inland, was applied to transect A. a, Prescribed change in ice thickness over transect length. b, The ratio of velocity change, calculated from equation (4). c, Left axis, observed ice velocity during 1985–94 (dotted green) and 2007–14 (dotted red). Modelled velocities in 2014 (solid lines) for the prescribed ice thicknesses. Right axis, ice thickness (dashed grey)24.

Extended Data Table 1 Statistical relationship between melting and ice motion

Supplementary information

Supplementary Data 1

This file contains a list of all the pairs of Landsat images processed to derive velocity fields. (XLSX 19 kb)

Supplementary Data 2

This file contains lists of the processed Landsat pairs which contribute to each velocity period. (XLSX 21 kb)

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Tedstone, A., Nienow, P., Gourmelen, N. et al. Decadal slowdown of a land-terminating sector of the Greenland Ice Sheet despite warming. Nature 526, 692–695 (2015).

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