Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

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

Summary: Temporal stability of the neodymium isotope signature
of the Holocene to glacial North Atlantic
Tina van de Flierdt,1
Laura F. Robinson,2
Jess F. Adkins,3
Sidney R. Hemming,1
and Steven L. Goldstein1
Received 17 March 2006; revised 8 July 2006; accepted 19 July 2006; published 25 November 2006.
[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 d13
C 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

  

Source: Adkins, Jess F. - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Environmental Sciences and Ecology; Geosciences