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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • Isostatic equilibrium grounding line between the West Antarctic inland ice sheet and the Ross Ice Shelf
  • Headwall retreat of ground-ice slumps, Banks Island, Northwest Territories
  • that the Beardmore drift limit is late Wisconsin (isotope stage 2) and the Meyer limit Stage 6 in age. The Beardmore and Meyer drift sheets represent thickening of the Beardmore Glacier in response to Ross Ice Shelf grounding during the last two global glaciations
  • . Ice-shelf grounding most likely resulted from lowered sea level and/or basal melting.
  • Glacier have thickened considerably during the last two global glaciations (late Wisconsin and marine isotope stage 6). The effect of ice-shelf grounding probably was the major control of these changes of Hatherton Glacier. Holocene ice-surface lowering
  • probably represents the last pulse of grounding-line recession in the southwestern Ross Embayment.
  • and a very thin layer of sediment over crystalline basement or older sediments. A reconstruction of the glacial history of Marguerite Bay since the last glacial maximum shows grounded ice filling the bay in late Wisconsin time. Rising sea level caused
  • and growth of the area of the subsidence and associated uplift to regional barriers between the basins. Other events : ice cover formation in the polar basin| seasonal freezing of the ground| permafrost developed since the Middle Pliocene.
  • and by analyses in the laboratory. Sand movements directly on the surface of the dune relief and sand drift within the air above ground are determined at different wind velocities. Additionally, migration of dune ridges in relation to wind velocities was measured
  • Modelling studies of underside of Brunt and Ross ice shelves suggest two main conclusions: 1. Ice-shelves are of major importance for sedimentation on the continental shelf. Bulk debris release occurs within the grounding-line zone which may