Research ArticleENVIRONMENTAL STUDIES

Discovery of a hypersaline subglacial lake complex beneath Devon Ice Cap, Canadian Arctic

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Science Advances  11 Apr 2018:
Vol. 4, no. 4, eaar4353
DOI: 10.1126/sciadv.aar4353
  • Fig. 1 Radar evidence for a subglacial lake complex on DIC.

    (A) Landsat image overlain with the location of the subglacial lakes (blue) and ice divides (black). (B) Bedrock topography of the DIC summit area overlain with selected radar profiles. The subglacial lakes are located within the bedrock troughs T1 and T2. (C) Relative reflectivity along the radar transects atop of bedrock contours. (D) Radar transects A to F. The top panel shows the radargrams. The middle panel shows the ice surface and bedrock elevation (black) and the hydraulic head (blue). The bottom panel shows the relative basal reflectivity along the transect (black) and the recorded specularity content along cross-profile F (blue). The estimated lake extents are highlighted by blue shading.

  • Fig. 2 Basal temperature, hydraulic head, and projected salt-bearing outcrops beneath DIC.

    (A) Bedrock elevation overlain with the hydraulic head (blue) and ice divides (black). The blue star indicates the location of the hydraulic head minimum in T2, whereas the arrow indicates the direction of water potentially outflowing T1. (B) Bedrock elevation contours overlain with modeled basal temperatures. The black triangle is the location of the ice temperature profile, where a basal temperature of −18.5°C was measured (26). (C) The area where the Bay Fiord Formation containing the bedded salt sequence is projected to outcrop beneath the ice is marked in yellow. Radar profiles are marked in blue/red. (D) Cross-section along radar transect CC′, revealing the projected geology consisting of the Bay Fiord Formation (yellow) and underlying sedimentary rocks (brown).

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/4/4/eaar4353/DC1

    fig. S1. Histogram of all recorded basal reflectivity values on DIC.

    fig. S2. Interpolated ice thickness near the DIC summit area.

    fig. S3. 3D geology model.

    fig. S4. Comparison of modeled geology and DMB solutions.

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. Histogram of all recorded basal reflectivity values on DIC.
    • fig. S2. Interpolated ice thickness near the DIC summit area.
    • fig. S3. 3D geology model.
    • fig. S4. Comparison of modeled geology and DMB solutions.

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