FN Archimer Export Format
PT J
TI Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic
BT 
AF GU, Sifan
   LIU, Zhengyu
   ZHANG, Jiaxu
   REMPFER, Johannes
   JOOS, Fortunat
   OPPO, Delia W.
AS 1:1;2:1,2;3:1,3,4;4:5,6;5:3,4;6:7;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Wisconsin Madison, Dept Atmospher & Ocean Sci, Madison, WI USA.
   Ohio State Univ, Dept Geog, Atmospher Sci Program, Columbus, OH 43210 USA.
   Los Alamos Natl Lab, Computat Phys & Methods, Los Alamos, NM USA.
   Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM USA.
   Univ Bern, Inst Phys, Climate & Environm Phys, Bern, Switzerland.
   Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland.
   Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA.
C2 UNIV WISCONSIN MADISON, USA
   UNIV OHIO STATE, USA
   LOS ALAMOS NATL LAB, USA
   LOS ALAMOS NATL LAB, USA
   UNIV BERN, SWITZERLAND
   UNIV BERN, SWITZERLAND
   WHOI, USA
IF 2.718
TC 22
UR https://archimer.ifremer.fr/doc/00495/60709/65334.pdf
   https://archimer.ifremer.fr/doc/00495/60709/65335.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
BO Marion Dufresne
DE ;AAIW;AMOC;deglacial;neodymium isotope;paleocirculation tracer
AB Antarctic Intermediate Water (AAIW) plays important roles in the global climate system and the global ocean nutrient and carbon cycles. However, it is unclear how AAIW responds to global climate changes. In particular, neodymium isotopic composition (epsilon(Nd)) reconstructions from different locations from the tropical Atlantic have led to a debate on the relationship between northward penetration of AAIW into the tropical Atlantic and the Atlantic meridional overturning circulation (AMOC) variability during the last deglaciation. We resolve this controversy by studying the transient oceanic evolution during the last deglaciation using a neodymium-enabled ocean model. Our results suggest a coherent response of AAIW and AMOC: when AMOC weakens, the northward penetration and transport of AAIW decrease while its depth and thickness increase. Our study highlights that as part of the return flow of the North Atlantic Deep Water, the northward penetration of AAIW in the Atlantic is determined predominately by AMOC intensity. Moreover, the inconsistency among different tropical Atlantic epsilon(Nd) reconstructions is reconciled by considering their corresponding core locations and depths, which were influenced by different water masses in the past. The very radiogenic water from the bottom of the Gulf of Mexico and the Caribbean Sea, which was previously overlooked in the interpretations of deglacial epsilon(Nd) variability, can be transported to shallow layers during active AMOC and modulates epsilon(Nd) in the tropical Atlantic. Changes in the AAIW core depth must also be considered. Thus, interpretation of epsilon(Nd) reconstructions from the tropical Atlantic is more complicated than suggested in previous studies. 
PY 2017
PD OCT
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 32
IS 10
UT 000414911700003
BP 1036
EP 1053
DI 10.1002/2017PA003092
ID 60709
ER

EF