Deep water provenance and dynamics of the (de)glacial Atlantic meridional overturning circulation
|Author(s)||Lippold Jorg1, 2, 3, Gutjahr Marcus4, 5, Blaser Patrick3, Christner Emanuel3, Ferreria Maria Luiza De Carvalho3, Mulitza Stefan6, Christl Marcus7, Wombacher Frank8, 9, Böhm Evelyn3, 10, Antz Benny3, Cartapanis Olivier1, 2, Vogel Hendrik1, 2, Jaccard Samuel L.1, 2|
|Affiliation(s)||1 : Univ Bern, Inst Geol Sci, CH-3012 Bern, Switzerland.
2 : Univ Bern, Oeschger Ctr Climate Change Res, CH-3012 Bern, Switzerland.
3 : Heidelberg Univ, Inst Environm Phys, D-69120 Heidelberg, Germany.
4 : Bristol Isotope Grp, Dept Earth Sci, Wills Mem Bldg, Bristol BS8 1RJ, Avon, England.
5 : GEOMAR Helmholtz Ctr Ocean Res Kiel, D-24148 Kiel, Germany.
6 : Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany.
7 : ETH, Lab Ion Beam Phys, CH-8093 Zurich, Switzerland.
8 : Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany.
9 : Univ Bonn, Steinmann Inst, D-53115 Bonn, Germany.
10 : LSCE, Gif Sur Yvette, France.
|Source||Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2016-07 , Vol. 445 , P. 68-78|
|WOS© Times Cited||74|
|Keyword(s)||Pa-231/Th-230, epsilon(Nd), Atlantic Meridional Overturning Circulation, deep sea sediments, Last Glacial Maximum, deglaciation|
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.