Assessing neodymium isotopes as an ocean circulation tracer in the Southwest Atlantic

Wu, Yingzhe; Pena, Leopoldo D.; Anderson, Robert F.; Hartman, Alison; Bolge, Louise; Basak, Chandranath; Kim, Joohee; Rijkenberg, Micha J.A.; Baar, H. J. W. de; Goldstein, Steven L.

doi:10.1016/j.epsl.2022.117846

Cited by 7 publications

(1 citation statement)

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“…Nevertheless, although we are confident that contribution of reactive/labile phases from sedimentary sources is negligible, we cannot completely exclude this rare diagenesis process. In this regard, a recent study has shown that to a great extent, the most reactive/labile neodymium is released at the surface ocean, well above the thermocline 61 . In addition, an external source of new radiogenic ε Nd values during prolonged periods of time should have been recorded elsewhere, but there are no evidences for it in the published records of authigenic or lithogenic neodymium [39][40][41]50,62 .…”

Section: Resultsmentioning

confidence: 99%

Eastern Mediterranean water outflow during the Younger Dryas was twice that of the present day

Trias-Navarro

Pena

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et al. 2023

Commun Earth Environ

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Eastern Mediterranean deep-intermediate convection was highly sensitive to varying inputs of fresh water fluxes associated with increased rainfall during the African Humid period (15-6 kyr Before Present). Here we investigate changes in the water-outflow from the Eastern Mediterranean Sea since the last deglaciation using neodymium isotope ratios. Our results indicate enhanced outflow during the Younger Dryas, two times higher than present-day outflow and about three times higher than during the last Sapropel. We propose that the increased outflow into the western Mediterranean over the Younger Dryas was the result of the combined effect of 1) enhanced climate-driven convection in the Aegean Sea and 2) reduced convection of western deep water during this period. Our results provide solid evidence for an enhanced Younger Dryas westward flow of Eastern Mediterranean sourced waters in consonance with an intensification of Mediterranean water-outflow during a weakened state of the Atlantic circulation.

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