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

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.


Pa-231/Th-230, epsilon(Nd), Atlantic Meridional Overturning Circulation, deep sea sediments, Last Glacial Maximum, deglaciation

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

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