Is ice-rafted sediment in a North Pole marine record evidence for perennial sea-ice cover?

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
L B TremblayP DeRepentigny

Abstract

Ice-rafted sediments of Eurasian and North American origin are found consistently in the upper part (13 Ma BP to present) of the Arctic Coring Expedition (ACEX) ocean core from the Lomonosov Ridge, near the North Pole (≈88° N). Based on modern sea-ice drift trajectories and speeds, this has been taken as evidence of the presence of a perennial sea-ice cover in the Arctic Ocean from the middle Miocene onwards (Krylov et al. 2008 Paleoceanography 23, PA1S06. (doi:10.1029/2007PA001497); Darby 2008 Paleoceanography 23, PA1S07. (doi:10.1029/2007PA001479)). However, other high latitude land and marine records indicate a long-term trend towards cooling broken by periods of extensive warming suggestive of a seasonally ice-free Arctic between the Miocene and the present (Polyak et al. 2010 Quaternary Science Reviews 29, 1757-1778. (doi:10.1016/j.quascirev.2010.02.010)). We use a coupled sea-ice slab-ocean model including sediment transport tracers to map the spatial distribution of ice-rafted deposits in the Arctic Ocean. We use 6 hourly wind forcing and surface heat fluxes for two different climates: one with a perennial sea-ice cover similar to that of the present day and one with seasonally ice-free conditions, similar to that simula...Continue Reading

References

Jun 2, 2006·Nature·Kathryn MoranYngve Kristoffersen
Jul 7, 2007·Science·Eske WillerslevMatthew J Collins
Jul 17, 2009·Nature·Catherine E StickleyLance E Kearns
Aug 13, 2014·Proceedings of the National Academy of Sciences of the United States of America·Dim CoumouHans Joachim Schellnhuber

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Citations

Apr 5, 2016·Nature Communications·Ruediger SteinGerrit Lohmann

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