North Atlantic Ice-Rafting, Ocean and Atmospheric Circulation During the Holocene: Insights From Western Mediterranean Speleothems

Y. Ait Brahim, J. A. Wassenburg, L. Sha, F. W. Cruz, M. Deininger, A. Sifeddine, L. Bouchaou, Christoph Spötl, R. L. Edwards, H. Cheng

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6 Scopus citations

Abstract

In this study, we present a Holocene rainfall index based on three high-resolution speleothem records from the Western Mediterranean, a region under the influence of the westerly winds belt modulated by the North Atlantic Oscillation (NAO). On centennial to millennial timescales, we show that the North Atlantic ice-rafting events were likely associated with negative NAO-like conditions during the Early Holocene and the Late Holocene. However, our data reveal that this is not clearly the case for the mid-Holocene ice-rafting events, during which we also show evidence of positive NAO-like patterns from other paleo-oceanographic and paleo-atmospheric data. Hence, contradictory mechanisms involving prolonged periods of both north and south shifts of the westerly winds belt (resembling positive and negative NAO-like patterns) might at least partially trigger or amplify the ice-rafting events and the slowdown of the Atlantic Meridional Overturning Circulation.

Original languageEnglish (US)
Pages (from-to)7614-7623
Number of pages10
JournalGeophysical Research Letters
Volume46
Issue number13
DOIs
StatePublished - Jul 16 2019

Keywords

  • Atlantic Meridional Overturning Circulation
  • Holocene
  • North Atlantic Oscillation
  • North Atlantic ice-rafting
  • Western Mediterranean
  • speleothems

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    Ait Brahim, Y., Wassenburg, J. A., Sha, L., Cruz, F. W., Deininger, M., Sifeddine, A., Bouchaou, L., Spötl, C., Edwards, R. L., & Cheng, H. (2019). North Atlantic Ice-Rafting, Ocean and Atmospheric Circulation During the Holocene: Insights From Western Mediterranean Speleothems. Geophysical Research Letters, 46(13), 7614-7623. https://doi.org/10.1029/2019GL082405