FN Archimer Export Format
PT J
TI Similar mid-depth Atlantic water mass provenance during the Last Glacial Maximum and Heinrich Stadial 1
BT 
AF HOWE, Jacob N. W.
   HUANG, Kuo-Fang
   OPPO, Delia W.
   CHIESSI, Cristiano M.
   MULITZA, Stefan
   BLUSZTAJN, Jurek
   PIOTROWSKI, Alexander M.
AS 1:1,2;2:2,3;3:2;4:4;5:5;6:2;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England.
   Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA.
   Acad Sinica, Inst Earth Sci, 128,Sec 2,Acad Rd, Taipei 11529, Taiwan.
   Univ Sao Paulo, Sch Arts Sci & Humanities, Av Arlindo Bettio 1000, BR-03828000 Sao Paulo, SP, Brazil.
   Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str, D-28359 Bremen, Germany.
C2 UNIV CAMBRIDGE, UK
   WHOI, USA
   ACAD SINICA, TAIWAN
   UNIV SAO PAULO, BRAZIL
   UNIV BREMEN MARUM, GERMANY
IF 4.637
TC 15
UR https://archimer.ifremer.fr/doc/00497/60818/101204.pdf
LA English
DT Article
CR VT 90 / SOUC
BO Marion Dufresne
DE ;Atlantic overturning;neodymium isotopes;Heinrich Stadial 1;Last Glacial Maximum
AB The delivery of freshwater to the North Atlantic during Heinrich Stadial 1 (HS1) is thought to have fundamentally altered the operation of Atlantic meridional overturning circulation (AMOC). Although benthic foraminiferal carbon isotope records from the mid-depth Atlantic show a pronounced excursion to lower values during HS1, whether these shifts correspond to changes in water mass proportions, advection, or shifts in the carbon cycle remains unclear. Here we present new deglacial records of authigenic neodymium isotopes - a water mass tracer that is independent of the carbon cycle-from two cores in the mid-depth South Atlantic. We find no change in neodymium isotopic composition, and thus water mass proportions, between the Last Glacial Maximum (LGM) and HS1, despite large decreases in carbon isotope values at the onset of HS1 in the same cores. We suggest that the excursions of carbon isotopes to lower values were likely caused by the accumulation of respired organic matter due to slow overturning circulation, rather than to increased southern-sourced water, as typically assumed. The finding that there was little change in water mass provenance in the mid-depth South Atlantic between the LGM and HS1, despite decreased overturning, suggests that the rate of production of mid-depth southern-sourced water mass decreased in concert with decreased production of northern-sourced intermediate water at the onset of HS1. Consequently, we propose that even drastic changes in the strength of AMOC need not cause a significant change in South Atlantic mid-depth water mass proportions. 
PY 2018
PD MAY
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier Science Bv
VL 490
UT 000430520600006
BP 51
EP 61
DI 10.1016/j.epsl.2018.03.006
ID 60818
ER

EF