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Hard rock landforms generate 130 km ice shelf channels through water focusing in basal corrugations

Author

Listed:
  • Hafeez Jeofry

    (Imperial College London
    Universiti Malaysia Terengganu)

  • Neil Ross

    (Newcastle University)

  • Anne Le Brocq

    (University of Exeter)

  • Alastair G.C. Graham

    (University of Exeter)

  • Jilu Li

    (University of Kansas)

  • Prasad Gogineni

    (The University of Alabama)

  • Mathieu Morlighem

    (University of California)

  • Thomas Jordan

    (Stanford University
    University of Bristol)

  • Martin J. Siegert

    (Imperial College London)

Abstract

Satellite imagery reveals flowstripes on Foundation Ice Stream parallel to ice flow, and meandering features on the ice-shelf that cross-cut ice flow and are thought to be formed by water exiting a well-organised subglacial system. Here, ice-penetrating radar data show flow-parallel hard-bed landforms beneath the grounded ice, and channels incised upwards into the ice shelf beneath meandering surface channels. As the ice transitions to flotation, the ice shelf incorporates a corrugation resulting from the landforms. Radar reveals the presence of subglacial water alongside the landforms, indicating a well-organised drainage system in which water exits the ice sheet as a point source, mixes with cavity water and incises upwards into a corrugation peak, accentuating the corrugation downstream. Hard-bedded landforms influence both subglacial hydrology and ice-shelf structure and, as they are known to be widespread on formerly glaciated terrain, their influence on the ice-sheet-shelf transition could be more widespread than thought previously.

Suggested Citation

  • Hafeez Jeofry & Neil Ross & Anne Le Brocq & Alastair G.C. Graham & Jilu Li & Prasad Gogineni & Mathieu Morlighem & Thomas Jordan & Martin J. Siegert, 2018. "Hard rock landforms generate 130 km ice shelf channels through water focusing in basal corrugations," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-06679-z
    DOI: 10.1038/s41467-018-06679-z
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