Temporal stability of the neodymium isotope signature of the Holocene to glacial North Atlantic

Publication Type  Journal Article
Year of Publication  2006
Authors  van de Flierdt, T.; Robinson, L. F.; Adkins, J. F.; Hemming, S. R.; Goldstein, S. L.
Journal Title  Paleoceanography
Volume  21
Issue  4
Pages  -
Journal Date  Nov 25
ISBN Number  0883-8305
Accession Number  ISI:000242370800002
Key Words  past ocean circulation; deep-water; thermohaline circulation; last deglaciation; labrador sea; nd; rates; constraints; variability; transport

[ 1] The neodymium isotopic composition of marine precipitates is increasingly recognized as a powerful tool for identifying changes in ocean circulation and mixing on million year to millennial timescales. Unlike nutrient proxies such as delta C-13 or Cd/Ca, Nd isotopes are not thought to be altered in any significant way by biological processes, and thus they can serve as a quasi-conservative water mass tracer. However, the application of Nd isotopes in understanding the role of thermohaline circulation in rapid climate change is currently hindered by the lack of direct constraints on the signature of the North Atlantic end-member through time. Here we present the first results of Nd isotopes measured in U-Th-dated deep-sea corals from the New England seamounts in the northwest Atlantic Ocean. Our data are consistent with the conclusion that the Nd isotopic composition of North Atlantic deep and intermediate water has remained nearly constant through the last glacial cycle. The results address long-standing concerns that there may have been significant changes in the Nd isotopic composition of the North Atlantic end-member during this interval and substantiate the applicability of this novel tracer on millennial timescales for paleoceanography research.


110IDTimes Cited:3Cited References Count:45

URL  <Go to ISI>://000242370800002
DOI  Doi 10.1029/2006pa001294