FN Archimer Export Format PT J TI Ventilation of the deep–ocean carbon reservoir during the last deglaciation: results from the Southeast Pacific BT AF Martínez Fontaine, Consuelo De Pol‐Holz, Ricardo Michel, Elisabeth Siani, Giuseppe Reyes‐Macaya, Dharma Martínez‐Méndez, Gema DeVries, Tim Stott, Lowell Southon, John Mohtadi, Mahyar Hebbeln, Dierk AS 1:1,3,4;2:2;3:3;4:4;5:5;6:5;7:6;8:7;9:8;10:5;11:5; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:; C1 Departamento de Geología, Universidad de Chile Centro de Investigación GAIA-Antárctica (CIGA) and Network for Extreme Environments Research (NEXER), Universidad de Magallanes, Punta Arenas, Chile Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Laboratoire mixte CNRS-CEA, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, Franc Geoscience Paris Sud (GEOPS) Universities of Paris Sud and Paris-Saclay, CNRS, 91405 Orsay, France MARUM, Center for Marine Environmental Sciences, University of Bremen, Leobener Straße, 28359 Bremen, Germany Earth Research Institute, UC Santa Barbara, Santa Barbara CA 93106-3060, USA Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Earth System Science Department, B321 Croul Hall, University of California, Irvine, California 92697, USA C2 UNIV CHILE, CHILE UNIV MAGALLANES, CHILE LSCE, FRANCE UNIV PARIS SUD, FRANCE UNIV BREMEN MARUM, GERMANY UNIV CALIF SANTA BARBARA, USA UNIV CALIF LOS ANGELES, USA UNIV CALIF IRVINE, USA IF 2.888 TC 4 UR https://archimer.ifremer.fr/doc/00591/70323/68370.pdf https://archimer.ifremer.fr/doc/00591/70323/68371.pdf https://archimer.ifremer.fr/doc/00591/70323/68372.xlsx https://archimer.ifremer.fr/doc/00591/70323/68373.xlsx LA English DT Article CR IMAGES 3-IPHIS-MD106 MD 126 / MONA MD159 / PACHIDERME VT 90 / SOUC BO Marion Dufresne AB Coeval changes in atmospheric CO2 and 14C contents during the last deglaciation are often attributed to ocean circulation changes that released carbon stored in the deep ocean during the Last Glacial Maximum (LGM). Work is being done to generate records that allow for the identification of the exact mechanisms leading to the accumulation and release of carbon from the oceanic reservoir, but these mechanisms are still the subject of debate. Here we present foraminifera 14C data from five cores in a transect across the Chilean continental margin between ~540 m and ~3100 m depth spanning the last 20,000 years. Our data reveal that during the LGM waters at ~2000 m were 50 to 80 % more depleted in Δ14C than waters at ~1500 m when compared to modern values, consistent with the hypothesis of a glacial deep–ocean carbon reservoir that was isolated from the atmosphere. During the deglaciation, our intermediate water records reveal homogenization in the Δ14C values between ~800 and ~1500 m from ~16.5–14.5 ka cal BP to ~14‐12 ka cal BP, which we interpret as deeper penetration of Antarctic Intermediate Water. While many questions still remain, this process could aid the ventilation of the deep ocean at the beginning of the deglaciation, contributing to the observed ~40 ppm rise in atmospheric pCO2. PY 2019 PD DEC SO Paleoceanography And Paleoclimatology SN 2572-4517 PU American Geophysical Union (AGU) VL 34 IS 12 UT 000503344400001 BP 2080 EP 2097 DI 10.1029/2019PA003613 ID 70323 ER EF