FN Archimer Export Format
PT J
TI Carbon 13 isotopes reveal limited ocean circulation changes between interglacials of the last 800 ka
BT 
AF Bouttes, N.
   Vazquez Riveiros, Natalia
   Govin, A.
   Swingedouw, D.
   Sanchez-Goni, M.F.
   Crosta, X.
   Roche, D.M.
AS 1:1,2;2:3;3:1;4:2;5:2,4;6:2;7:1,5;
FF 1:;2:PDG-REM-GM-LGS;3:;4:;5:;6:;7:;
C1 Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL; CEA-CNRS-UVSQ, Université Paris-Saclay; Gif-sur-Yvette, France
   Université de Bordeaux, EPOC, UMR 5805; Pessac, France
   IFREMER, Unité de Géosciences Marines, Pointe du Diable; Plouzané, France
   Ecole Pratique des Hautes Etudes (EPHE, PSL University); Pessac ,France
   Earth and Climate Cluster, Faculty of Science; Vrije Universiteit Amsterdam; Amsterdam The Netherlands
C2 CNRS, FRANCE
   UNIV BORDEAUX, FRANCE
   IFREMER, FRANCE
   EPHE, FRANCE
   UNIV VRIJE AMSTERDAM, NETHERLANDS
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3.277
TC 3
UR https://archimer.ifremer.fr/doc/00619/73130/72285.pdf
LA English
DT Article
AB Ice core data have shown that atmospheric CO2 concentrations during interglacials were lower before the Mid Brunhes Event (MBE, ~430 ka), than after the MBE by around 30 ppm. To explain such a difference, it has been hypothesized that increased bottom water formation around Antarctica or reduced Atlantic Meridional Overturning Circulation (AMOC) could have led to greater oceanic carbon storage before the MBE, resulting in less carbon in the atmosphere. However, only few data on possible changes in interglacial ocean circulation across the MBE have been compiled, hampering model‐data comparison. Here we present a new global compilation of benthic foraminifera carbon isotopic (δ13C) records from 31 marine sediment cores covering the last 800 ka, with the aim of evaluating possible changes of interglacial ocean circulation across the MBE. We show that a small systematic difference between pre‐ and post‐MBE interglacial δ13C is observed. In pre‐MBE interglacials, northern source waters tend to have slightly higher δ13C values and penetrate deeper, which could be linked to an increased northern sourced water formation or a decreased southern sourced water formation. Numerical model simulations tend to support the role of abyssal water formation around Antarctica: decreased convection there associated with increased sinking of dense water along the continental slopes results in increased δ13C values in the Atlantic in agreement with pre‐MBE interglacial data. It also yields reduced atmospheric CO2 as in pre‐MBE records, despite a smaller simulated amplitude change compared to data, highlighting the need for other processes to explain the MBE transition. 
PY 2020
PD MAY
SO Paleoceanography And Paleoclimatology
SN 2572-4517
PU American Geophysical Union (AGU)
VL 35
IS 5
UT 000537787100004
DI 10.1029/2019PA003776
ID 73130
ER

EF