Science Advances

Supplementary Materials

The PDF file includes:

  • Fig. S1. Locations of figs. S2 to 6 and S8 to S12.
  • Fig. S2. Troughs and fracture in the shear margins of the Jutulstraumen Glacier and Fimbul Ice Shelf.
  • Fig. S3. Troughs and fracture in the shear margins of the Rayner Glacier and Ice Shelf.
  • Fig. S4. Troughs and fracture in the shear margins of the Denman Glacier and Shackleton Ice Shelf.
  • Fig. S5. Troughs and fracture in the shear margins of the Ninnis Glacier and Ice Shelf.
  • Fig. S6. Troughs and fracture in the shear margins of the PIG and Ice Shelf.
  • Fig. S7. Observations for all 33 identified persistent polynyas.
  • Fig. S8. Trough in the left-lateral shear margin of the Fisher Glacier and Amery Ice Shelf.
  • Fig. S9. Troughs in the shear margins of the Byrd Glacier and Ross Ice Shelf.
  • Fig. S10. Trough in the shear margins of the Bindschadler Ice Stream and Ross Ice Shelf.
  • Fig. S11. Trough in the left-lateral shear margin of the Evans Ice Stream and Ronne Ice Shelf.
  • Fig. S12. Trough in the right-lateral shear margin of the Slessor Ice Stream and Filchner Ice Shelf.
  • Table S1. Comparison of characteristics of ice shelves with observed continuous shear margin troughs from grounded to floating ice in figs. S2 to S6 and S8 to S22.
  • Legends for movies S1 to S13

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Other Supplementary Material for this manuscript includes the following:

  • Movie S1 (.mov format). Calving and collapse of Jakobshavn Isbrae.
  • Movie S2 (.mov format). Persistent polynyas on PIG.
  • Movie S3 (.mov format). Persistent polynyas on Thwaites Glacier.
  • Movie S4 (.mov format). Persistent polynyas on the Crosson Ice Shelf.
  • Movie S5 (.mov format). Persistent polynyas on Eastern Getz Ice Shelf.
  • Movie S6 (.mov format). Persistent polynyas on the Western Getz Ice Shelf (DeVicq Glacier).
  • Movie S7 (.mov format). Persistent polynyas on the Sulzberger Ice Shelf.
  • Movie S8 (.mov format). Persistent polynyas on the Lillie and Rennick Ice Shelves.
  • Movie S9 (.mov format). Persistent polynyas on Totten Glacier.
  • Movie S10 (.mov format). Persistent polynyas on the northern George VI and Wilkins Ice Shelves.
  • Movie S11 (.mov format). Persistent polynyas on the southern George VI and Bach Ice Shelves.
  • Movie S12 (.mov format). Persistent polynyas on the Venable and Abbot Ice Shelve.
  • Movie S13 (.mov format). Persistent polynyas on the Cosgrove Ice Shelf.

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