FN Archimer Export Format
PT J
TI Atlantic-Pacific seesaw and its role in outgassing CO2 during Heinrich events
BT 
AF MENVIEL, L.
   ENGLAND, M. H.
   MEISSNER, K. J.
   MOUCHET, A.
   YU, J.
AS 1:1,2;2:1,2;3:1,2;4:3,4;5:5;
FF 1:;2:;3:;4:;5:;
C1 Univ New S Wales, Climate Change Res Ctr, Sydney, NSW 2052, Australia.
   ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia.
   UVSQ, LSCE, IPSL, CEA,CNRS, Gif Sur Yvette, France.
   Univ Liege, Astrophys Geophys & Oceanog Dept, Liege, Belgium.
   Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia.
C2 UNIV NEW S WALES, AUSTRALIA
   ARC, AUSTRALIA
   IPSL, FRANCE
   UNIV LIEGE, BELGIUM
   UNIV AUSTRALIAN NATL, AUSTRALIA
IF 3.738
TC 76
UR https://archimer.ifremer.fr/doc/00291/40227/38679.pdf
   https://archimer.ifremer.fr/doc/00291/40227/38680.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES 3-IPHIS-MD106
   MD 131 / AUSCAN
BO Marion Dufresne
AB Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO2 increase. However, previous modeling studies display conflicting atmospheric CO2 responses to an AMOC shutdown. Here we use model simulations combined with paleoproxy records to show that depending on the deep and bottom water transport in the Northern and Southern Pacific Ocean during an AMOC weakening, the ocean can act either as a sink or a source of carbon. Results from idealized meltwater experiments as well as from a transient experiment covering Heinrich stadial 4 suggest that a shutdown of the AMOC during Heinrich stadials 4 (HS4) and 1 (HS1) led to an enhancement of Antarctic Bottom Water (AABW) and North Pacific Deep Water (NPDW) transport. We show that enhanced deep and bottom water transport in the Pacific Ocean ventilates deep Pacific carbon through the Southern Ocean, thus contributing to a rise in atmospheric CO2. This mechanism yields a good agreement between paleoproxy records and modeling results, thus highlighting the possible establishment of an Atlantic-Pacific seesaw during Heinrich stadials. Enhanced AABW and NPDW transport could account for most of the observed atmospheric CO2 increase during HS4 and for about 30% of the atmospheric CO2 increase during HS1.
PY 2014
PD JAN
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 29
IS 1
UT 000337977700005
BP 58
EP 70
DI 10.1002/2013PA002542
ID 40227
ER

EF