FN Archimer Export Format
PT J
TI Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘   La Grande Vasière   ’ mid-shelf mud belt
BT 
AF Mojtahid, Meryem
   Durand, Matthieu
   Coste, Pierre-Olivier
   Toucanne, Samuel
   Howa, Hélène
   Nizou, Jean
   Eynaud, Frédérique
   Penaud, Aurélie
AS 1:1;2:1;3:1,2;4:3;5:1;6:3;7:4;8:2;
FF 1:;2:;3:;4:PDG-REM-GM-LGS;5:;6:PDG-REM-GM-LGS;7:;8:;
C1 LPG-BIAF, UMR-CNRS 6112, University of Angers, France
   University of Brest and Laboratoire Géosciences Océan, CNRS UMR 6538, Institut Universitaire Européen de la Mer, France
   Laboratoire Géodynamique et enregistrement Sédimentaire, IFREMER, France
   UMR CNRS 5805 EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux), University of Bordeaux, France
C2 UNIV ANGERS, FRANCE
   UBO, FRANCE
   IFREMER, FRANCE
   UNIV BORDEAUX, FRANCE
SI BREST
SE PDG-REM-GM-LGS
UM LGO
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 2.353
TC 8
UR https://archimer.ifremer.fr/doc/00471/58300/60820.pdf
   https://archimer.ifremer.fr/doc/00471/58300/60821.pdf
LA English
DT Article
CR CABTEX
BO Pourquoi pas ?
DE ;AMOC;Bay of Biscay;benthic foraminifera;NAO-like process;river runoff;stable isotopes
AB A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with Rosalina globularis showing an overall decrease in absolute and relative abundances from ~7 to 0.4 cal. ka BP, whereas the opposite trend is observed for Cibicides refulgens and Lobatula. These long-term patterns are interpreted as a response to the overall cooling trend and/or the progressive deepening of the water column because of the relative sea-level (RSL) rise. Foraminiferal δ18O and grain-size analyses show a significant shift around 3.5–2.5 cal. ka BP toward a heavier isotopic signature and finer sediments. We mainly link this change to enhanced contribution of continental freshwaters and fine sediments after the near-stabilization of the RSL rise. By reducing coastal accommodation spaces, this led to a better channelization of river outflows and probably to the formation of the modern winter thermohaline front. Superimposed on these long-term patterns, our data highlight strong millennial-scale variability (1250-year peak). Such cyclicity is consistent with several records tracing changes in rainfall and storminess regimes in northern Europe, and the dynamics of the subpolar gyre (SPG). We suggest a millennial time-scale control of a NAO-like (North Atlantic Oscillation) climatic process modulating continental humidity (and the associated river discharges) and SPG dynamics through wind stress. Spectral analyses reveal an additional 500-year frequency peak implying a possible solar forcing. 
PY 2019
PD MAR
SO Holocene
SN 0959-6836
PU SAGE Publications
VL 29
IS 3
UT 000461697500008
BP 467
EP 480
DI 10.1177/0959683618816478
ID 58300
ER

EF