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Evidence for an ice shelf covering the central Arctic Ocean during the penultimate glaciation
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Geological Sciences.
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Number of Authors: 25
2016 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 7, 10365Article in journal (Refereed) Published
Abstract [en]

The hypothesis of a km-thick ice shelf covering the entire Arctic Ocean during peak glacial conditions was proposed nearly half a century ago. Floating ice shelves preserve few direct traces after their disappearance, making reconstructions difficult. Seafloor imprints of ice shelves should, however, exist where ice grounded along their flow paths. Here we present new evidence of ice-shelf groundings on bathymetric highs in the central Arctic Ocean, resurrecting the concept of an ice shelf extending over the entire central Arctic Ocean during at least one previous ice age. New and previously mapped glacial landforms together reveal flow of a spatially coherent, in some regions41-km thick, central Arctic Ocean ice shelf dated to marine isotope stage 6 (similar to 140 ka). Bathymetric highs were likely critical in the ice-shelf development by acting as pinning points where stabilizing ice rises formed, thereby providing sufficient back stress to allow ice shelf thickening.

Place, publisher, year, edition, pages
2016. Vol. 7, 10365
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Other Natural Sciences
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URN: urn:nbn:se:su:diva-127293DOI: 10.1038/ncomms10365ISI: 000369022100002PubMedID: 26778247OAI: oai:DiVA.org:su-127293DiVA: diva2:942337
Available from: 2016-06-23 Created: 2016-03-01 Last updated: 2016-06-23Bibliographically approved

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Jakobsson, MartinNilsson, JohanBackman, JanKirchner, NinaO'Regan, MatthewStranne, ChristianBarrientos Macho, NataliaCoxall, HelenEriksson, BjörnFlodén, TomGustafsson, ÖrjanJohansson, CarinaMohammad, Rezwan
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Department of Geological SciencesDepartment of Meteorology Department of Environmental Science and Analytical Chemistry
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