FN Archimer Export Format
PT J
TI High-resolution neodymium characterization along the Mediterranean margins and modelling of epsilon(Nd) distribution in the Mediterranean basins
BT 
AF AYACHE, Mohamed
   DUTAY, Jean-Claude
   ARSOUZE, Thomas
   REVILLON, Sidonie
   BEUVIER, Jonathan
   JEANDEL, Catherine
AS 1:1;2:1;3:2,3;4:4;5:5,6;6:7;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Paris Saclay, LSCE, IPSL, CEA,CNRS,UVSQ, F-91191 Gif Sur Yvette, France.
   Univ Paris Saclay, ENSTA ParisTech, 828 Bd Marechaux, F-91762 Palaiseau, France.
   Ecole Polytech, Meteorol Dynam Lab, Palaiseau, France.
   UBO, CNRS, Lab Domaines Ocean, IUEM,SEDISOR,UMR6538, Plouzane, France.
   Mercator Ocean, Ramonville St Agne, France.
   Meteo France, Toulouse, France.
   Univ Toulouse, CNRS, CNES, LEGOS,IRD,UPS, Toulouse, France.
C2 UNIV PARIS SACLAY, FRANCE
   UNIV PARIS SACLAY, FRANCE
   ECOLE POLYTECH, FRANCE
   UBO, FRANCE
   MERCATOR OCEAN, FRANCE
   CNRM (METEO FRANCE), FRANCE
   UNIV TOULOUSE, FRANCE
UM LGO
IN DOAJ
IF 3.851
TC 21
UR https://archimer.ifremer.fr/doc/00639/75064/75547.pdf
   https://archimer.ifremer.fr/doc/00639/75064/75548.zip
   https://archimer.ifremer.fr/doc/00639/75064/75549.zip
   https://archimer.ifremer.fr/doc/00639/75064/75550.pdf
LA English
DT Article
AB An extensive compilation of published neodymium (Nd) concentrations and isotopic compositions (Nd IC) was realized in order to establish a new database and a map (using a high-resolution geological map of the area) of the distribution of these parameters for all the Mediterranean margins. Data were extracted from different kinds of samples: river solid discharge deposited on the shelf, sedimentary material collected on the margin or geological material outcropping above or close to a margin. Additional analyses of surface sediments were done in order to improve this data set in key areas (e.g. Sicilian strait). The Mediterranean margin Nd isotopic signatures vary from non-radiogenic values around the Gulf of Lion, (epsilon(Nd) values similar to -11) to radiogenic values around the Aegean and the Levantine sub-basins up to +6. Using a high-resolution regional oceanic model (1/12 degrees of horizontal-resolution), epsilon(Nd) distribution was simulated for the first time in the Mediterranean Sea. The high resolution of the model provides a unique opportunity to represent a realistic thermohaline circulation in the basin and thus apprehend the processes governing the Nd isotope distribution in the marine environment. Results are consistent with the preceding conclusions on boundary ex-change (BE) as an important process in the Nd oceanic cycle. Nevertheless this approach simulates a too-radiogenic value in the Mediterranean Sea; this bias will likely be corrected once the dust and river inputs will be included in the model. This work highlights that a significant interannual variability of epsilon(Nd) distribution in seawater could occur. In particular, important hydrological events such as the Eastern Mediterranean Transient (EMT), associated with deep water formed in the Aegean sub-basin, could induce a shift in epsilon(Nd) at deep/intermediate depths that could be noticeable in the eastern part of the basin. This underlines that the temporal and geographical variations of epsilon(Nd) could represent an interesting insight of Nd as tracer of the Mediterranean Sea circulation, in particular in the context of palaeo-oceanographic applications. 
PY 2016
PD SEP
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 13
IS 18
UT 000383966100001
BP 5259
EP 5276
DI 10.5194/bg-13-5259-2016
ID 75064
ER

EF