13 C Record of Benthic Foraminifera in the Last Interglacial Ocean: Implications for the Carbon Cycle and the Global Deep Water Circulation

• Published in: Quaternary Research
• Main Authors: Duplessy, Jean-Claude, Shackleton, Nicholas, Matthews, Robley, Prell, Warren, Ruddiman, William, Caralp, Michèle, Hendy, Chris
• Other Authors: Centre des Faibles Radioactivités, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences Cambridge, UK, University of Cambridge UK (CAM)-University of Cambridge UK (CAM), Department of Geological Sciences Providence, Brown University, Lamont-Doherty Earth Observatory (LDEO), Columbia University New York, Département de Géologie et d'Océanographie Talence (DGO), Université Sciences et Technologies - Bordeaux 1 (UB)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1984
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; Antarctic; The Antarctic; Antarc*
• Online Access: https://hal.science/hal-03516590; https://doi.org/10.1016/0033-5894(84)90099-1

International audience The 13 C/ 12 C ratios of Upper Holocene benthic foraminiferal tests (genera Cibicides and Uvigerina ) of deep sea cores from the various world ocean basins have been compared with those of the modern total carbon dioxide (TCO 2 ) measured during the GEOSECS program. The δ 13 C difference between benthic foraminifera and TCO 2 is 0.07 ± 0.04‰ for Cibicides and −0.83 ± 0.07‰ for Uvigerina at the 95% confidence level. δ 13 C analyses of the benthic foraminifera that lived during the last interglaciation (isotopic substage 5e, about 120,000 yr ago) show that the bulk of the TCO 2 in the world ocean had a δ 13 C value 0.15 ± 0.12‰ lower than the modern one at the 95% confidence level, reflecting a depletion, compared to the present value, of the global organic carbon reservoir. Regional differences in δ 13 C between the various oceanic basins are explained by a pattern of deep water circulation different from the modern one: the Antarctic Bottom Water production was higher than today during the last interglaciation, but the eastward transport in the Circumpolar Deep Water was lower.