FN Archimer Export Format
PT J
TI Modeling the Nd isotopic composition in the North Atlantic basin using an eddy-permitting model
BT 
AF ARSOUZE, Thomas
   TREGUIER, Anne-Marie
   PERONNE, Simon
   DUTAY, J. -C.
   LACAN, F.
   JEANDEL, C.
AS 1:1,2,3;2:1;3:1;4:2;5:3;6:2;
FF 1:PDG-DOP-DCB-OPS-LPO;2:;3:PDG-DOP-DCB-OPS-LPO;4:;5:;6:;
C1 IFREMER CNRS UBO IRD, Lab Phys Oceans, UMR6523, Plouzane, France.
   CEA CNRS UVSQ IPSL, Lab Sci Climat & Environm, Gif Sur Yvette, France.
   CNES CNRS UPS OMP IRD, Lab Etudes Geophys & Oceanographie Spatiale, Toulouse, France.
C2 IFREMER, FRANCE
   CEA, FRANCE
   CNES, FRANCE
   CNRS, FRANCE
SI BREST
SE PDG-DOP-DCB-OPS-LPO
IN WOS Ifremer jusqu'en 2018
   copubli-france
IF 1.443
TC 9
UR https://archimer.ifremer.fr/doc/00013/12412/9201.pdf
LA English
DT Article
AB Boundary Exchange (BE - exchange of elements between continental margins and the open ocean) has been emphasized as a key process in the oceanic cycle of neodymium (Nd) (Lacan and Jeandel, 2005a). Here, we use a regional eddy-permitting resolution Ocean General Circulation Model (1/4A degrees) of the North Atlantic basin to simulate the distribution of the Nd isotopic composition, considering BE as the only source. Results show good agreement with the data, confirming previous results obtained using the same parameterization of the source in a coarse resolution global model (Arsouze et al., 2007), and therefore the major control played by the BE processes in the Nd cycle on the regional scale. We quantified the exchange rate of the BE, and found that the time needed for the continental margins to significantly imprint the chemical composition of the surrounding seawater (further referred as characteristic exchange time) is of the order of 0.2 years. However, the timescale of the BE may be subject to large variations as a very short exchange time (a few days) is needed to reproduce the highly negative values of surface waters in the Labrador Sea, whereas a longer one (up to 0.5 years) is required to simulate the radiogenic influence of basaltic margins and distinguish the negative isotopic signatures of North Atlantic Deep Water from the more radiogenic southern origin water masses. This likely represents geographical variations in erosion fluxes and the subsequent particle load onto the continental margins. Although the parameterization of the BE is the same in both configurations of the model, the characteristic exchange time in the eddy-permitting configuration is significantly lower than the previous evaluations using a low resolution configuration (6 months to 10 years), but however in agreement with the available seawater Nd isotope data. This results highlights the importance of the model dynamics in simulating the BE process.
PY 2010
SO Ocean Science
SN 1812-0784
PU Copernicus Gesellschaft Mbh
VL 6
IS 3
UT 000281431600012
BP 789
EP 797
DI 10.5194/os-6-789-2010
ID 12412
ER

EF