Paired carbon isotope and cadmium data from benthic foraminifera: Implications for changes in oceanic phosphorus, oceanic circulation, and atmospheric carbon dioxide

Details Paired carbon isotope and cadmium data from benthic foraminifera: Implications for changes in oceanic phosphorus, oceanic circulation, and atmospheric carbon dioxide Paired carbon isotope and cadmium data from benthic foraminifera: Implications for changes in oceanic phosphorus, oceanic circulation, and atmospheric carbon dioxide

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..265b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 2, pp.265-276

Physics

11

Scientific paper

The carbon isotope and cadmium content of foraminiferal shells from oceanic sediments provides information on past chemical distributions in the ocean. Starting from reasonable assumptions, it can be shown that paired data on both tracers provides more information than does either separately. The slope of paired isochronous 13 C and Cd / Ca data from fossil benthic foraminifera depends on oceanic P:Cd and gD 13 C : P ratios. The zero Cd / Ca intercept of this line depends on mean oceanic 13 C , P, and the 13 C : P ratio. Given data sufficient to define oceanic mean 13 C and Cd contents, it is possible to place quantitative constraints on the product of the C:P Redfield Ratio and mean oceanic phosphorus, and to estimate a circulation parameter which is independent of changes in ocean chemical inventories. With the limited available data, no significant changes in oceanic P:Cd can be detected between the Holocene and most recent glacial maximum. If this data is taken to be representative of the whole ocean, then the P and Cd contents of the ocean were about 17% higher during the last glacial maximum than at present. Ocean box models indicate that this change in oceanic P, and a 2°C deep ocean cooling during glacials, would cause a 47 ppmV reduction in atmospheric P CO 2 during glacial intervals.

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