Browsing by Author "Esteves, Mariana da Silveira Ramos"
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- ItemIceshelf instability and the collapsing NW margin of the Laurentide Ice Sheet: core evidence from Viscount Melville Sound, Arctic Canada(2013) Furze, Mark F.A.; Pieńkowski, Anna J.; England, John H.; Esteves, Mariana da Silveira Ramos; Bennett, Robbie; Krywko, Jack; Glembiski, Danna; McLean, Brian; Blasco, SteveRecent work in the western Canadian Arctic Archipelago has seen a dramatic re-evaluation of the timing and extent of Late Wisconsinan glaciation by a primarily cold-based Laurentide Ice sheet. This has included the occupation by ice of formerly-considered ice free terrain and the extension of grounded ice from the main channels of the Northwest Passage, westwards onto the Beaufort Sea continental shelf. Nonetheless, while the pattern of ice extent and initial retreat is now well constrained, significant questions remain regarding the main phase of ice retreat southeastwards onto mainland Canada and the stability of the retreating margin in response to ameliorating climate and sea-level change.
- ItemThe marine signal of a collapsing ice margin: the catastrophic advance and collapse of the end Pleistocene Viscount Melville Sound Ice Shelf, Canadian Arctic Archipelago(2015) Furze, Mark F.A.; Pieńkowski, Anna J.; Nichols, Keir; Reedman, Amy; Esteves, Mariana da Silveira Ramos; Cage, Alix; Bennett, RobbieThis detailed study contributes towards an improved understanding of the constraints placed on the streaming of ice from M’Clintock Channel and the resulting draw-down and destabilization of the NW sector of the Laurentide Ice Sheet. Emerging foraminiferal, diatom, and biogeochemical data provide valuable insights into the deglacial and postglacial history of the western Northwest Passage.