FN Archimer Export Format
PT J
TI Intermediate and deep ocean current circulation in the Mozambique Channel: New insights from ferromanganese crust Nd isotopes
BT 
AF Charles, Claire
   Pelleter, Ewan
   Révillon, Sidonie
   Nonnotte, Philippe
   Jorry, Stephan
   Kluska, Jean-Michel
AS 1:1,2;2:1;3:2,3;4:2;5:1;6:4;
FF 1:PDG-REM-GM-LCG;2:PDG-REM-GM-LCG;3:;4:;5:PDG-REM-GM-LGS;6:;
C1 IFREMER, Unité Géosciences Marines, Laboratoire Cycles Géochimiques (LCG), F-29280 Plouzané, France
   Univ Brest, CNRS, UMR 6538 (Laboratoire Géosciences Océan), Institut Universitaire Européen de la Mer (IUEM), Place Nicolas Copernic, 29280 Plouzané, France
   SEDISOR/UMR 6538 (Laboratoire Géosciences Océan), Institut Universitaire Européen de la Mer (IUEM), Place Nicolas Copernic, F-29280 Plouzané, France
   TOTAL Exploration and Production, CSTJF, Avenue Larribau, F-64000, Pau, France
C2 IFREMER, FRANCE
   UBO, FRANCE
   SEDISOR, FRANCE
   TOTAL, FRANCE
SI BREST
SE PDG-REM-GM-LCG
   PDG-REM-GM-LGS
UM LGO
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 3.548
TC 7
UR https://archimer.ifremer.fr/doc/00653/76488/77569.pdf
   https://archimer.ifremer.fr/doc/00653/76488/77752.pdf
LA English
DT Article
CR NOSICAA - MD 06
   PAMELA-MOZ01
   RIDA - MD39
BO Marion Dufresne
   L'Atalante
DE ;Ferromanganese crusts;Nd isotopes;Paleoceanography;Mozambique Channel;North Atlantic Deep Water
AB The Mozambique Channel plays a key role in the exchange of water masses between the Indian and Atlantic Oceans, which include the North Atlantic Deep Water (NADW) inflow from the south and the North Indian Deep Water (NIDW), an aged form of the NADW spreading poleward from the northern and equatorial Indian Ocean basin. Several authors assume that the Davie Ridge acts as a topographic barrier to the northward advection of NADW, which would therefore be absent in the Comoros Basin. Other studies suggest that the NADW flows from the south of the Mozambique Channel to the Comoros Basin, indicating that the Davie Ridge may not currently constitute a blocking topographic barrier to deep water mass circulation. To address this question, we studied ferromanganese (Fe, Mn) crusts collected over 2000 km in the Mozambique Channel, from the Agulhas Plateau to the Glorieuses Islands. Neodymium (Nd) isotope compositions (εNd) of surface scrapings range between εNd = −10.1 above the Agulhas Plateau, which might reflect the NADW inflow, and more radiogenic values between εNd = −8.0 and − 8.2 in the Glorieuses area, highlighting the NIDW influence. However, value of εNd = −9.4 measured north of the Davie Ridge cannot be explained by the sole influence of the NIDW and therefore highlights the advection of the NADW northeast of the Comoros Basin. We estimate that the contribution of the NADW through the channel is up to 68% in the Agulhas Plateau and 60% north of the Davie Ridge. These findings are consistent with previous hydrographic studies and suggest that the Davie Ridge does not currently act as topographic barrier to deep currents. 
PY 2020
PD DEC
SO Marine Geology
SN 0025-3227
PU Elsevier BV
VL 430
UT 000595643300018
DI 10.1016/j.margeo.2020.106356
ID 76488
ER

EF