BibTex format
@article{Lambelet:2016:10.1016/j.gca.2015.12.019,
author = {Lambelet, M and van, de Flierdt T and Crocket, K and Rehkamper, M and Kreissig, K and Coles, B and Rijkenberg, MJA and Gerringa, LJA and de, Baar HJW and Steinfeldt, R},
doi = {10.1016/j.gca.2015.12.019},
journal = {Geochimica et Cosmochimica Acta},
pages = {1--29},
title = {Neodymium isotopic composition and concentration in the western North Atlantic Ocean: results from the GEOTRACES GA02 section},
url = {http://dx.doi.org/10.1016/j.gca.2015.12.019},
volume = {177},
year = {2016}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - The neodymium (Nd) isotopic composition of seawater is commonly used as a proxy to study past changes in the thermohaline circulation. The modern database for such reconstructions is however poor and the understanding of the underlying processes is incomplete. Here we present new observational data for Nd isotopes and concentrations from twelve seawater depth profiles, which follow the flow path of North Atlantic Deep Water (NADW) from its formation region in the North Atlantic to the northern equatorial Atlantic. Samples were collected during two cruises constituting the northern part of the Dutch GEOTRACES transect GA02 in 2010. The results show that the different water masses in the subpolar North Atlantic Ocean, which ultimately constitute NADW, have the following Nd isotope characteristics: Upper Labrador Sea Water (ULSW), εNd = -14.2 ± 0.3; Labrador Sea Water (LSW), εNd = -13.7 ± 0.9; Northeast Atlantic Deep Water (NEADW), εNd = -12.5 ± 0.6; Northwest Atlantic Bottom Water (NWABW), εNd = -11.8 ± 1.4. In the subtropics, where these source water masses have mixed to form NADW, which is exported to the global ocean, upper-NADW is characterised by εNd values of -13.2 ± 1.0 (2sd) and lower-NADW exhibits values of εNd = -12.4 ± 0.4 (2sd). While both signatures overlap within error, the signature for lower-NADW is significantly more radiogenic than the traditionally used value for NADW (εNd = -13.5) due to the dominance of source waters from the Nordic Seas (NWABW and NEADW). Comparison between the concentration profiles and the corresponding Nd isotope profiles with other water mass properties such as salinity, silicate concentrations, neutral densities and chlorofluorocarbon (CFC) concentration provides novel insights into the geochemical cycle of Nd and reveals that different processes are necessary to account for the observed Nd characteristics in the subpolar and su
AU - Lambelet,M
AU - van,de Flierdt T
AU - Crocket,K
AU - Rehkamper,M
AU - Kreissig,K
AU - Coles,B
AU - Rijkenberg,MJA
AU - Gerringa,LJA
AU - de,Baar HJW
AU - Steinfeldt,R
DO - 10.1016/j.gca.2015.12.019
EP - 29
PY - 2016///
SN - 0016-7037
SP - 1
TI - Neodymium isotopic composition and concentration in the western North Atlantic Ocean: results from the GEOTRACES GA02 section
T2 - Geochimica et Cosmochimica Acta
UR - http://dx.doi.org/10.1016/j.gca.2015.12.019
UR - https://www.sciencedirect.com/science/article/pii/S0016703715007139
UR - http://hdl.handle.net/10044/1/28815
VL - 177
ER -