FN Archimer Export Format
PT J
TI Atlantic Ocean ventilation changes across the last deglaciation and their carbon cycle implications
BT 
AF Skinner, L. C.
   Freeman, E.
   Hodell, D.
   Waelbroeck, C.
   VAZQUEZ RIVEIROS, Natalia
   Scrivner, A.E
AS 1:1;2:1;3:1;4:2;5:3;6:1;
FF 1:;2:;3:;4:;5:PDG-REM-GM-LGS;6:;
C1 Godwin Laboratory for Palaeoclimate Research Department of Earth Sciences University of Cambridge, CB2 3EQ, UK
   Laboratoire d'Océanographie et du Climat: Expérimentation et Approches Numériques, LOCEAN/IPSL Sorbonne Université‐CNRS‐IRD‐MNHN, UMR 7159, Paris, France
   Laboratoire Géodynamique et enregistrement Sédimentaire (PDG‐REM‐GM‐LGS), IFREMER, Brest, France
C2 UNIV CAMBRIDGE, UK
   CNRS, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
IF 3.992
TC 18
UR https://archimer.ifremer.fr/doc/00665/77717/79810.pdf
   https://archimer.ifremer.fr/doc/00665/77717/79811.docx
   https://archimer.ifremer.fr/doc/00665/77717/79812.xlsx
   https://archimer.ifremer.fr/doc/00665/77717/79813.xlsx
   https://archimer.ifremer.fr/doc/00665/77717/79814.xlsx
   https://archimer.ifremer.fr/doc/00665/77717/79815.xlsx
LA English
DT Article
CR MD 167 / RETRO (IMAGES XVI)
BO Marion Dufresne
DE ;air‐sea exchange;AMOC;carbon cycle;deglaciation;radiocarbon;ventilation
AB Changes in ocean ventilation, controlled by both overturning rates and air‐sea gas exchange, are thought to have played a central role in atmospheric CO2 rise across the last deglaciation. Here we constrain the nature of Atlantic Ocean ventilation changes over the last deglaciation using radiocarbon and stable carbon isotopes from two depth transects in the Atlantic basin. Our findings broadly cohere with the established pattern of deglacial Atlantic overturning change, and underline the existence of active northern sourced deep‐water export at the Last Glacial Maximum (LGM). We find that the western Atlantic was less affected by incursions of southern‐sourced deep water, as compared to the eastern Atlantic, despite both sides of the basin being strongly influenced by the air‐sea equilibration of both northern‐ and southern deep‐water end‐members. Ventilation at least as strong as modern is observed throughout the Atlantic during the Bølling‐Allerød (BA), implying a ‘flushing’ of the entire Atlantic water column that we attribute to the combined effects of AMOC reinvigoration and increased air‐sea equilibration of southern sourced deep‐water. This ventilation ‘overshoot’ may have counteracted a natural atmospheric CO2 decline during interstadial conditions, helping to make the BA a ‘point of no return’ in the deglacial process. While the collected data emphasize a predominantly indirect AMOC contribution to deglacial atmospheric CO2 rise, via far field impacts on convection in the Southern Ocean and/or North Pacific during HS1 and the YD, the potential role of the AMOC in centennial CO2 pulses emerges as an important target for future work. 
PY 2021
PD FEB
SO Paleoceanography And Paleoclimatology
SN 2572-4517
PU American Geophysical Union
VL 36
IS 2
UT 000624116800001
DI 10.1029/2020PA004074
ID 77717
ER

EF