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Evidence for an ice shelf covering the central Arctic Ocean during the penultimate glaciation

Journal article
Authors M. Jakobsson
J. Nilsson
Leif G Anderson
J. Backman
Göran Björk
T. M. Cronin
N. Kirchner
A. Koshurnikov
L. Mayer
R. Noormets
M. O'Regan
C. Stranne
R. Ananiev
N. B. Macho
D. Cherniykh
H. Coxall
B. Eriksson
T. Floden
L. Gemery
O. Gustafsson
K. Jerram
C. Johansson
A. Khortov
R. Mohammad
I. Semiletov
Published in Nature Communications
Volume 7
Pages article no. 10365
ISSN 2041-1723
Publication year 2016
Published at Department of marine sciences
Pages article no. 10365
Language en
Keywords lomonosov ridge sediments, continental-margin, northern eurasia, late, pleistocene, oxygen-isotope, yermak plateau, sheet, paleoceanography, stratigraphy, ostracode
Subject categories Oceanography


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.

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