FN Archimer Export Format
PT J
TI Glacial-interglacial circulation changes inferred from Pa-231/Th-230 sedimentary record in the North Atlantic region
BT 
AF GHERARDI, Jeanne Marie
   LABEYRIE, L.
   NAVE, S.
   FRANCOIS, R.
   MCMANUS, J. F.
   CORTIJO, E.
AS 1:1;2:2;3:5;4:3;5:4;6:2;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Bergen, Bjerknes Ctr Climate Res, N-5007 Bergen, Norway.
   CNRS, Lab Sci Climat & Environm, F-91190 Gif Sur Yvette, France.
   Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada.
   Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA.
   Inst Nacl Engn Tecnol & Inovacao, Dept Geol Marinha, P-2720866 Amadora, Portugal.
C2 UNIV BERGEN, NORWAY
   LSCE, FRANCE
   UNIV BRITISH COLUMBIA, CANADA
   WHOI, USA
   LNEG, PORTUGAL
IF 3.644
TC 170
UR https://archimer.ifremer.fr/doc/00233/34468/32855.pdf
   https://archimer.ifremer.fr/doc/00233/34468/32856.pdf
   https://archimer.ifremer.fr/doc/00233/34468/32858.pdf
LA English
DT Article
CR IMAGES 1-MD101
BO Marion Dufresne
DE ;MOC;North Atlantic;deglaciation;231Pa/230Th
AB Studies from the subtropical western and eastern Atlantic Ocean, using the Pa-231/Th-230 ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this study, we present a compilation of existing and new sedimentary Pa-231/Th-230 records from North Atlantic cores between 1710 and 4550 m water depth. Comparing sedimentary Pa-231/Th-230 from different depths provides new insights into the evolution of the geometry and rate of deep water formation in the North Atlantic during the last 20,000 years. The Pa-231/Th-230 ratio measured in upper Holocene sediments indicates slow water renewal above similar to 2500 m and rapid flushing below, consistent with our understanding of modern circulation. In contrast, during the Last Glacial Maximum (LGM), Glacial North Atlantic Intermediate Water (GNAIW) drove a rapid overturning circulation to a depth of at least similar to 3000 m depth. Below similar to 4000 m, water renewal was much slower than today. At the onset of Heinrich event 1, transport by the overturning circulation declined at all depths. GNAIW shoaled above 3000 m and significantly weakened but did not totally shut down. During the Bolling-Allerod (BA) that followed, water renewal rates further decreased above 2000 m but increased below. Our results suggest for the first time that ocean circulation during that period was quite distinct from the modern circulation mode, with a comparatively higher renewal rate above 3000 m and a lower renewal rate below in a pattern similar to the LGM but less accentuated. MOC during the Younger Dryas appears very similar to BA down to 2000 m and slightly slower below.
PY 2009
PD MAY
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 24
IS 2 / PA2204
UT 000265676100002
BP 1
EP 14
DI 10.1029/2008PA001696
ID 34468
ER

EF