Rapid reductions in North Atlantic Deep Water during the peak of the last interglacial period

Eirik Vinje Galaasen, Ulysses S. Ninnemann, Nil Irvali, Helga F. Kleiven, Yair Rosenthal, Catherine Kissel, David A. Hodell

Research output: Contribution to journalArticle

64 Scopus citations

Abstract

Deep ocean circulation has been considered relatively stable during interglacial periods, yet little is known about its behavior on submillennial time scales. Using a subcentennially resolved epibenthic foraminiferal δ13C record, we show that the influence of North Atlantic Deep Water (NADW) was strong at the onset of the last interglacial period and was then interrupted by several prominent centennial-scale reductions. These NADW transients occurred during periods of increased ice rafting and southward expansions of polar water influence, suggesting that a buoyancy threshold for convective instability was triggered by freshwater and circum-Arctic cryosphere changes. The deep Atlantic chemical changes were similar in magnitude to those associated with glaciations, implying that the canonical view of a relatively stable interglacial circulation may not hold for conditions warmer and fresher than at present.

Original languageEnglish (US)
Pages (from-to)1129-1132
Number of pages4
JournalScience
Volume343
Issue number6175
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • General

Fingerprint Dive into the research topics of 'Rapid reductions in North Atlantic Deep Water during the peak of the last interglacial period'. Together they form a unique fingerprint.

  • Cite this

    Galaasen, E. V., Ninnemann, U. S., Irvali, N., Kleiven, H. F., Rosenthal, Y., Kissel, C., & Hodell, D. A. (2014). Rapid reductions in North Atlantic Deep Water during the peak of the last interglacial period. Science, 343(6175), 1129-1132. https://doi.org/10.1126/science.1248667