Buried iceberg scours reveal reduced North Atlantic Current during the stage 12 deglacial

Andrew M.W. Newton*, Mads Huuse, Simon H. Brocklehurst

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
180 Downloads (Pure)

Abstract

Reconstructing past ocean-climate environments and heat transport requires proxies from which these conditions can be quantified. This is particularly important for the evaluation of numerical palaeoclimate models. Here we present new evidence for a reduced North Atlantic Current (NAC) at the termination of the third last glacial, for which palaeocurrent information was previously unavailable. This is based on an exquisitely preserved set of buried iceberg scours seen in three-dimensional seismic reflection images from the mid-Norwegian slope. The scours were formed â 1/4430 ka during the transition from glacial to interglacial conditions. The spiral geometry of the scours suggests that they were carved by grounded icebergs influenced by tidal and geostrophic ocean currents. Using the ratio between the estimated tidal and geostrophic current velocities and comparing them with velocities from the Last Glacial Maximum and the present, we show that the stage 12 NAC velocities may have been â 1/450% slower than the present.

Original languageEnglish
Article number10927
Pages (from-to)1-7
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 16 Mar 2016
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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