FN Archimer Export Format
PT J
TI Hydrological variations of the intermediate water masses of the western Mediterranean Sea during the past 20 ka inferred from neodymium isotopic composition in foraminifera and cold-water corals
BT 
AF DUBOIS-DAUPHIN, Quentin
   MONTAGNA, Paolo
   SIANI, Giuseppe
   DOUVILLE, Eric
   WIENBERG, Claudia
   HEBBELN, Dierk
   LIU, Zhifei
   KALLEL, Nejib
   DAPOIGNY, Arnaud
   REVEL, Marie
   PONS-BRANCHU, Edwige
   TAVIANI, Marco
   COLIN, Christophe
AS 1:1;2:2,3;3:1;4:4;5:5;6:5;7:6;8:7;9:4;10:8;11:4;12:2,9;13:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;
C1 Univ Paris Saclay, Univ Paris Sud, Lab Geosci Paris Sud GEOPS, F-91405 Orsay, France.
   ISMAR CNR, Via Gobetti 101, I-40129 Bologna, Italy.
   Columbia Univ, Lamont Doherty Earth Observ, 61 Route 9W, Palisades, NY 10964 USA.
   Univ Paris Saclay, CEA CNRS UVSQ, Lab Sci Climat & Environm, LSCE IPSL, F-91191 Gif Sur Yvette, France.
   Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str, D-28359 Bremen, Germany.
   Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China.
   Univ Sfax, Lab Georessources Mat Environm & Changements Glob, LR13ES23, Fac Sci Sfax, BP1171, Sfax 3000, Tunisia.
   CNRS, OCA, IRD, Geoazur,UNS, 250 Rue Albert Einstein, F-06500 Valbonne, France.
   Woods Hole Oceanog Inst, Dept Biol, 266 Woods Hole Rd, Woods Hole, MA 02543 USA.
C2 UNIV PARIS SACLAY, FRANCE
   CNR ISMAR, ITALY
   UNIV COLUMBIA, USA
   UNIV PARIS SACLAY, FRANCE
   UNIV BREMEN, GERMANY
   UNIV TONGJI, CHINA
   UNIV SFAX, TUNISIA
   CNRS, FRANCE
   WHOI, USA
IN DOAJ
IF 3.174
TC 20
UR https://archimer.ifremer.fr/doc/00420/53193/55001.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   PALEOCINAT II
   PROMETE 90 (2)
BO Marion Dufresne
   Le Suroît
AB We present the neodymium isotopic composition (epsilon Nd) of mixed planktonic foraminifera species from a sediment core collected at 622m water depth in the Balearic Sea, as well as epsilon Nd of scleractinian cold-water corals (CWC; Madrepora oculata, Lophelia pertusa) retrieved between 280 and 442m water depth in the Alboran Sea and at 414m depth in the southern Sardinian continental margin. The aim is to constrain hydrological variations at intermediate depths in the western Mediterranean Sea during the last 20 kyr. Planktonic (Globigerina bulloides) and benthic (Cibicidoides pachyderma) foraminifera from the Balearic Sea were also analyzed for stable oxygen (delta O-18) and carbon (delta C-13) isotopes. The foraminiferal and coral epsilon Nd values from the Balearic and Alboran seas are comparable over the last similar to 13 kyr, with mean values of -8.94 +/- 0.26 (1 sigma; n = 24) and -8.91 +/- 0.18 (1 sigma; n = 25), respectively. Before 13 ka BP, the foraminiferal epsilon Nd values are slightly lower (-9.28 +/- 0.15) and tend to reflect higher mixing between intermediate and deep waters, which are characterized by more unradiogenic epsilon Nd values. The slight epsilon Nd increase after 13 ka BP is associated with a decoupling in the benthic foraminiferal delta C-13 composition between intermediate and deeper depths, which started at similar to 16 ka BP. This suggests an earlier stratification of the water masses and a subsequent reduced contribution of unradiogenic epsilon Nd from deep waters. The CWC from the Sardinia Channel show a much larger scatter of epsilon Nd values, from 8.66 +/- 0.30 to 5.99 +/- 0.50, and a lower average (7.31 +/- 0.73; n = 19) compared to the CWC and foraminifera from the Alboran and Balearic seas, indicative of intermediate waters sourced from the Levantine basin. At the time of sapropel S1 deposition (10.2 to 6.4 ka), the epsilon Nd values of the Sardinian CWC become more unradiogenic (8.38 +/- 0.47; n = 3 at similar to 8.7 ka BP), suggesting a significant contribution of intermediate waters originated from the western basin. We propose that western Mediterranean intermediate waters replaced the Levantine Intermediate Water (LIW), and thus there was a strong reduction of the LIW during the mid-sapropel (similar to 8.7 ka BP). This observation supports a notable change of Mediterranean circulation pattern centered on sapropel S1 that needs further investigation to be confirmed. 
PY 2017
PD JAN
SO Climate Of The Past
SN 1814-9324
PU Copernicus Gesellschaft Mbh
VL 13
IS 1
UT 000393756400001
BP 17
EP 37
DI 10.5194/cp-13-17-2017
ID 53193
ER

EF