CHANGES IN THE DISTRIBUTION OF 513C OF DEEP WATER ZCO2 BETWEEN THE LAST GLACIATION AND THE HOLOCENE - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Paleoceanography Année : 1988

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

Résumé

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.
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hal-03550978 , version 1 (01-02-2022)

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W. B Curry, J.C. C Duplessy, L. D Labeyrie, N. J Shackleton. CHANGES IN THE DISTRIBUTION OF 513C OF DEEP WATER ZCO2 BETWEEN THE LAST GLACIATION AND THE HOLOCENE. Paleoceanography, 1988, 3 (3), pp.317-341. ⟨10.1029/PA003i003p00317⟩. ⟨hal-03550978⟩

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