FN Archimer Export Format
PT J
TI Southwest Pacific vertical structure influences on oceanic carbon storage since the Last Glacial Maximum
BT 
AF Clementi, Vincent J.
   Sikes, Elisabeth L.
AS 1:1;2:1;
FF 1:;2:;
C1 Department of Marine and Coastal SciencesRutgers University New Brunswick New Jersey ,USA
C2 UNIV NEW BRUNSWICK, USA
IF 2.888
TC 9
UR https://archimer.ifremer.fr/doc/00488/59920/63110.pdf
   https://archimer.ifremer.fr/doc/00488/59920/63111.pdf
LA English
DT Article
CR IMAGES 3-IPHIS-MD106
   MD 152 / MATACORE
BO Marion Dufresne
AB Lower atmospheric CO2 concentrations during the Last Glacial Maximum (LGM; 23.0‐18.0 ka) have been attributed to the sequestration of respired carbon in the ocean interior, yet the mechanism responsible for the release of this CO2 during the deglaciation remains uncertain. Here, we present calculations of vertical differences in oxygen and carbon isotopes (∆δ18O and ∆δ13C, respectively) from a depth transect of southwest Pacific Ocean sediment cores to reconstruct changes in water mass structure and CO2 storage. During the LGM, ∆δ18O indicates a more homogenous deep Pacific below 1100 m, whereas regional ∆δ13C elucidates greater sequestration of CO2 in two distinct layers: enhanced CO2 storage at intermediate depths between ~940 m and 1400 m, and significantly more CO2 at 1600 m and below. This highlights an isolated glacial intermediate water mass and places the main geochemical divide at least 500 m shallower than the Holocene. During the initial stages of the deglaciation in Heinrich Stadial 1 (HS1; 17.5‐14.5 ka), restructuring of the upper ~2000 m of the southwest Pacific water column coincided with sea‐ice retreat and rapid CO2 release from intermediate depths, while CO2 release in the deep ocean was earlier and more gradual than in the waters above it. These changes suggest that sea ice retreat and shifts in Southern Ocean frontal locations contributed to rapid CO2 ventilation from the Southern Ocean's intermediate depths and gradual ventilation from the deep ocean during the early deglaciation. 
PY 2019
PD MAY
SO Paleoceanography And Paleoclimatology
SN 2572-4517
PU American Geophysical Union (AGU)
VL 34
IS 5
UT 000471238100001
BP 734
EP 754
DI 10.1029/2018PA003501
ID 59920
ER

EF