Universität zu Köln

Lippold, Jorg ORCID: 0000-0003-1976-5065, Gutjahr, Marcus ORCID: 0000-0003-2556-2619, Blaser, Patrick, Christner, Emanuel ORCID: 0000-0002-0058-9906, Ferreria, Maria Luiza de Carvalho, Mulitza, Stefan ORCID: 0000-0002-3842-1447, Christl, Marcus ORCID: 0000-0002-3131-6652, Wombacher, Frank ORCID: 0000-0002-0755-8918, Boehm, Evelyn, Antz, Benny, Cartapanis, Olivier, Vogel, Hendrik ORCID: 0000-0002-9902-8120 and Jaccard, Samuel L. (2016). Deep water provenance and dynamics of the (de)glacial Atlantic meridional overturning circulation. Earth Planet. Sci. Lett., 445. S. 68 - 79. AMSTERDAM: ELSEVIER. ISSN 1385-013X

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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 (epsilon(Nd)) and the Pa-231/Th-230 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 Pa-231/Th-230 and epsilon(Nd) 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 similar to 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. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lippold, Jorg UNSPECIFIED orcid.org/0000-0003-1976-5065 UNSPECIFIED Gutjahr, Marcus UNSPECIFIED orcid.org/0000-0003-2556-2619 UNSPECIFIED Blaser, Patrick UNSPECIFIED UNSPECIFIED UNSPECIFIED Christner, Emanuel UNSPECIFIED orcid.org/0000-0002-0058-9906 UNSPECIFIED Ferreria, Maria Luiza de Carvalho UNSPECIFIED UNSPECIFIED UNSPECIFIED Mulitza, Stefan UNSPECIFIED orcid.org/0000-0002-3842-1447 UNSPECIFIED Christl, Marcus UNSPECIFIED orcid.org/0000-0002-3131-6652 UNSPECIFIED Wombacher, Frank UNSPECIFIED orcid.org/0000-0002-0755-8918 UNSPECIFIED Boehm, Evelyn UNSPECIFIED UNSPECIFIED UNSPECIFIED Antz, Benny UNSPECIFIED UNSPECIFIED UNSPECIFIED Cartapanis, Olivier UNSPECIFIED UNSPECIFIED UNSPECIFIED Vogel, Hendrik UNSPECIFIED orcid.org/0000-0002-9902-8120 UNSPECIFIED Jaccard, Samuel L. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-271394
DOI:	10.1016/j.epsl.2016.04.013
Journal or Publication Title:	Earth Planet. Sci. Lett.
Volume:	445
Page Range:	S. 68 - 79
Date:	2016
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1385-013X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WESTERN NORTH-ATLANTIC; SOUTH-ATLANTIC; ISOTOPIC COMPOSITION; NEODYMIUM ISOTOPES; BENTHIC DELTA-C-13; OCEAN CIRCULATION; LATE QUATERNARY; PARTICLE-FLUX; PA-231/TH-230; ND Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27139