CHANGES IN THE DISTRIBUTION OF 513C OF DEEP WATER ZCO2 BETWEEN THE LAST GLACIATION AND THE HOLOCENE

• Published in: Paleoceanography
• Main Authors: Curry, W., Duplessy, J.C., Labeyrie, L., Shackleton, N.
• Other Authors: Woods Hole Oceanographic Institution (WHOI), 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)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1988
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; Pacific; Southern Ocean; North Atlantic Deep Water; North Atlantic
• Online Access: https://hal.science/hal-03550978; https://hal.science/hal-03550978/document; https://hal.science/hal-03550978/file/Paleoceanography%20-%20June%201988%20-%20Curry%20-%20Changes%20in%20the%20distribution%20of%2013C%20of%20deep%20water%20CO2%20between%20the%20Last%20Glaciation.pdf; https://doi.org/10.1029/PA003i003p00317

International audience Carbon isotopic measurements on the benthic foraminiferal genus Cibicidoides document that mean deep ocean 513C values were 0.46 ø/00 lower during the last glacial maximum than during the Late IIolocene. The geographic distribution of 5•3C was altered by changes in the production rate of nutrient-depleted deep water in the North Atlantic. During the Late Holocene, North Atlantic Deep Water, with high 513C values and low nutrient values, can be found throughout the Atlantic Ocean, and its effects can be traced into the southern ocean where it mixes with recirculated Pacific deep water. During the glaciation, decreased production of North Atlantic Deep Water allowed southern ocean deep water to penetrate farther into the North Atlantic and across low-latitude fracture zones into the eastern Atlantic. Mean southern ocean 5•3C values during the glaciation are lower than both North Atlantic and Pacific 5•3C values, suggesting that production of nutrient-depleted water occurred in both oceans during the glaciation. Enriched •3C values in shallow cores within the Atlantic Ocean indicate the existence of a nutrient-depleted water mass above 2000 m in this ocean.