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

Lippold, Jörg, Gutjahr, Marcus, Blaser, Patrick, Christner, Emanuel, de Carvalho Ferreira, Maria Luiza, Mulitza, Stefan, Christl, Marcus, Wombacher, Frank, Böhm, Evelyn, Antz, Benny, Cartapanis, Olivier, Vogel, Hendrik and Jaccard, Samuel L. (2016) Deep water provenance and dynamics of the (de)glacial Atlantic meridional overturning circulation Earth and Planetary Science Letters, 445 . pp. 68-78. DOI 10.1016/j.epsl.2016.04.013.

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Supplementary data:

Abstract

Highlights

• Six combined 231Pa/230Th and εNdεNd down-core profiles back to 25 ka are presented.
• Increased influence of SCW and northward advection of deep waters during LGM/HS1.
• Evidence for an active but shallower northern overturning cell during LGM/HS1.

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.

Document Type: Article
Additional Information: WOS:000376713500007 - Erratum: Earth and Planetary Science Letters, 458 pp. 444 - 448 DOI: 10.1016/j.epsl.2016.11.005
Keywords: 231Pa/230Th, εNd, Atlantic Meridional Overturning Circulation, deep sea sediments, Last Glacial Maximum, deglaciation
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.1016/j.epsl.2016.04.013
ISSN: 0012-821X
Related URLs:
Date Deposited: 03 May 2016 13:51
Last Modified: 04 May 2017 12:00
URI: http://eprints.uni-kiel.de/id/eprint/32370

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