Deep water provenance and dynamics of the (de)glacial Atlantic meridional overturning circulation

Jörg Lippold, Marcus Gutjahr, Patrick Blaser, Emanuel Christner, Maria Luiza de Carvalho Ferreira, Stefan Mulitza, Marcus Christl, Frank Wombacher, Evelyn Böhm, Benny Antz, Olivier Cartapanis, Hendrik Vogel, Samuel L. Jaccard

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Reconstructing past modes of ocean circulation is an essential task in paleoclimatology and paleoceanography. To this end, we combine two sedimentary proxies, Nd isotopes (εNdεNd) and the 231Pa/230Th ratio, both of which are not directly involved in the global carbon cycle, but allow the reconstruction of water mass provenance and provide information about the past strength of overturning circulation, respectively. In this study, combined 231Pa/230Th and εNdεNd down-core profiles from six Atlantic Ocean sediment cores are presented. The data set is complemented by the two available combined data sets from the literature. From this we derive a comprehensive picture of spatial and temporal patterns and the dynamic changes of the Atlantic Meridional Overturning Circulation over the past ∼25 ka. Our results provide evidence for a consistent pattern of glacial/stadial advances of Southern Sourced Water along with a northward circulation mode for all cores in the deeper (>3000 m) Atlantic. Results from shallower core sites support an active overturning cell of shoaled Northern Sourced Water during the LGM and the subsequent deglaciation. Furthermore, we report evidence for a short-lived period of intensified AMOC in the early Holocene.
Original languageEnglish
Pages (from-to)68-78
Number of pages11
JournalEarth and Planetary Science Letters
Volume445
Early online date21 Apr 2016
DOIs
Publication statusPublished - 1 Jul 2016

Keywords

  • 231Pa/230Th
  • ε Nd
  • Atlantic Meridional Overturning Circulation
  • deep sea sediments
  • Last Glacial Maximum
  • deglaciation

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