Stable carbon and oxygen isotope ratios of benthic foraminifera


Carbon isotopic measurements on the benthic foraminiferal genus Cibicidoides document that mean deep ocean delta13C values were 0.46 per mil lower during the last glacial maximum than during the Late Holocene. The geographic distribution of delta13C 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 delta13C 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 delta13C values during the glaciation are lower than both North Atlantic and Pacific delta13C values, suggesting that production of nutrient-depleted water occurred in both oceans during the glaciation. Enriched 13C values in shallow cores within the Atlantic Ocean indicate the existence of a nutrient-depleted water mass above 2000 m in this ocean.

Further relevant datasets: Zahn et al. (1982) doi:10.1594/PANGAEA.52239, Shackleton (1977) doi:10.1594/PANGAEA.692062

Supplement to: Sarnthein, Michael; Winn, Kyaw; Duplessy, Jean-Claude; Fontugne, Michel R (1988): Global variations of surface ocean productivity in low and mid latitudes: influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years. Paleoceanography, 3(3), 361-399

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Metadata Access
Creator Curry, William B; Duplessy, Jean-Claude; Labeyrie, Laurent D; Shackleton, Nicholas J
Publisher PANGAEA
Publication Year 1988
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 51 datasets
Discipline Geosciences; Natural Sciences
Spatial Coverage (-106.178W, -43.822S, 134.130E, 64.783N); South Atlantic; North Atlantic; Atlantic Ocean; East Atlantic; Pacific Ocean; Indian Ocean; South Indian Ocean
Temporal Coverage Begin 1963-04-07T00:00:00Z
Temporal Coverage End 1984-11-09T00:00:00Z