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Evidence from ice shelves for channelized meltwater flow beneath the Antarctic Ice Sheet

Nature Geoscience volume 6, pages 945948 (2013) | Download Citation


Meltwater generated beneath the Antarctic Ice Sheet exerts a strong influence on the speed of ice flow, in particular for major ice streams1,2. The subglacial meltwater also influences ocean circulation beneath ice shelves, initiating meltwater plumes that entrain warmer ocean water and cause high rates of melting3. However, despite its importance, the nature of the hydrological system beneath the grounded ice sheet remains poorly characterized. Here we present evidence, from satellite and airborne remote sensing, for large channels beneath the floating Filchner–Ronne Ice Shelf in West Antarctica, which we propose provide a means for investigating the hydrological system beneath the grounded ice sheet. We observe features on the surface of the ice shelf from satellite imagery and, using radar measurements, show that they correspond with channels beneath the ice shelf. We also show that the sub-ice-shelf channels are aligned with locations where the outflow of subglacial meltwater has been predicted. This agreement indicates that the sub-ice-shelf channels are formed by meltwater plumes, initiated by subglacial water exiting the upstream grounded ice sheet in a focused (channelized) manner. The existence of a channelized hydrological system has implications for the behaviour and dynamics of ice sheets and ice shelves near the grounding lines of ice streams in Antarctica.

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  1. 1.

    , & Increased flow speed on a large East Antarctic outlet glacier caused by subglacial floods. Nature Geosci. 1, 827–831 (2008).

  2. 2.

    , & Basal mechanics of Ice Stream B, West Antarctica 1. Till mechanics. J. Geophys. Res. 105, 463–481 (2000).

  3. 3.

    Convection-driven melting near the grounding line of Ice Shelves and Tidewater Glaciers. J. Phys. Oceanogr. 41, 2279–2294 (2011).

  4. 4.

    Principles of Glacier Mechanics 2nd edn, Ch. 8, 197–251 (Cambridge Univ. Press, 2005).

  5. 5.

    et al. Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier. Nature Geosci. 3, 408–411 (2010).

  6. 6.

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

  7. 7.

    , & Subglacial meltwater channel systems and ice sheet overriding, Asgard Range, Antarctica. Geogr. Ann. A 73, 109–121 (1991).

  8. 8.

    & Subglacial drainage, eskers, and deforming beds beneath the Laurentide and Eurasian ice sheets. Geol. Soc. Am. Bull. 106, 304–314 (1994).

  9. 9.

    , , & Rapid discharge connects Antarctic subglacial lakes. Nature 440, 1033–1036 (2006).

  10. 10.

    , , & A subglacial water-flow model for West Antarctica. J. Glaciol. 55, 879–888 (2009).

  11. 11.

    , , , & MODIS-based Mosaic of Antarctica (MOA) data sets: Continent-wide surface morphology and snow grain size. Remote Sens. Environ. 111, 242–257 (2007).

  12. 12.

    & Longitudinal surface structures (flowstripes) on Antarctic glaciers. Cryosphere 6, 383–391 (2012).

  13. 13.

    et al. Steep reverse bed slope at the grounding line of the Weddell Sea sector in West Antarctica. Nature Geosci. 5, 393–396 (2012).

  14. 14.

    et al. Sub-glacial channels and fracture in the floating portion of Pine Island Glacier, Antarctica. J. Geophys. Res. 117, F03012 (2012).

  15. 15.

    & Ice–ocean interaction on Ronne Ice Shelf, Antarctica. J. Geophys. Res. 96, 791–813 (1991).

  16. 16.

    , , & Ice-shelf basal channels in a coupled ice/ocean model. J. Glaciol. 58, 1227–1244 (2012).

  17. 17.

    & Channelized bottom melting and stability of floating ice shelves. Geophys. Res. Lett. 35, L02503 (2008).

  18. 18.

    et al. Mapping the grounding zone of the Amery Ice Shelf, East Antarctica using InSAR, MODIS and ICESat. Antarct. Sci. 21, 515–532 (2009).

  19. 19.

    , , & The role of Pine Island Glacier ice shelf basal channels in deep-water upwelling, polynyas and ocean circulation in Pine Island Bay, Antarctica. Ann. Glaciol. 53, 123–128 (2012).

  20. 20.

    & Melting and freezing beneath Filchner-Ronne Ice Shelf, Antarctica. Geophys. Res. Lett. 30, 1477 (2003).

  21. 21.

    , , , & Influence of tides on melting and freezing beneath Filchner-Ronne Ice Shelf, Antarctica. Geophys. Res. Lett. 38, L06601 (2011).

  22. 22.

    et al. GLAS/ICESat L2 Antarctic and Greenland Ice Sheet Altimetry Data version 31, 20th February 2003 to 8th April 2009 (NSICD, 2011).

  23. 23.

    , & Ice flow of the Antarctic Ice sheet. Science 333, 1427–1430 (2011).

  24. 24.

    et al. Bedmap2: Improved ice bed, surface and thickness datasets for Antarctica. Cryosphere 7, 375–393 (2013).

  25. 25.

    & The supply of subglacial meltwater to the grounding line of the Siple Coast, West Antarctica. Ann. Glaciol. 53, 267–280 (2012).

  26. 26.

    , , , & Marine ice in Larsen Ice Shelf. Geophys. Res. Lett. 36, L11604 (2009).

  27. 27.

    , & Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf. J. Geophys. Res. 114, F04007 (2009).

  28. 28.

    , , , & Contributions from glacially derived sediment to the global iron (oxyhydr)oxide cycle: Implications for iron delivery to the oceans. Geochim. Cosmochim. Acta 70, 2765–2780 (2006).

  29. 29.

    Antarctic subglacial conditions inferred from a hybrid ice sheet/ice stream model. Earth Planet. Sci. Lett. 295, 451–461 (2010).

  30. 30.

    Movement of water in glaciers. J. Glaciol. 11, 205–214 (1972).

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A.M.L.B. was financially supported through NERC fellowship NE/G012733/2, aerogeophysical survey measurements were funded by UK NERC AFI grant NE/G013071/1. J.A.G. was financially supported by the European Space Agency’s Changing Earth Science network. S. Roulliard drew Fig. 3.

Author information


  1. Geography, College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK

    • Anne M. Le Brocq
  2. School of Geography, Politics and Sociology, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK

    • Neil Ross
  3. Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK

    • Jennifer A. Griggs
    • , Antony J. Payne
    •  & Martin J. Siegert
  4. School of Geosciences, University of Edinburgh, Edinburgh EH8 9XP, UK

    • Robert G. Bingham
  5. British Antarctic Survey, Cambridge CB3 0ET, UK

    • Hugh F. J. Corr
    • , Fausto Ferraccioli
    • , Adrian Jenkins
    •  & Tom A. Jordan
  6. Environment Department, University of York, York YO10 5DD, UK

    • David M. Rippin


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A.M.L.B. wrote the paper, J.A.G. processed the ICESat data, and N.R. and H.F.J.C. processed the radar data. A.J.P. and A.J. provided expertise on the nature of meltwater plumes and their interaction with the ice shelf. M.J.S., F.F., N.R., R.G.B., H.F.J.C., T.A.J., A.M.L.B. and D.M.R. were involved in the aerogeophysical survey. All authors commented on a draft of the paper.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Anne M. Le Brocq.

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