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Stable isotope analyses

ME Mohamed M. Ezat
TR Tine L. Rasmussen
BH Bärbel Hönisch
JG Jeroen Groeneveld
Pd Peter deMenocal
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Pristine specimens of the benthic foraminifera Melonis barleeanus (∼30 specimens, size fraction 150–315 μm) and the planktic foraminifera N. pachyderma (∼50 specimens, size fraction 150–250 μm) were picked for stable isotope analyses. The stable oxygen and carbon isotope analyses were performed using a Finnigan MAT 251 mass spectrometer with an automated carbonate preparation device at MARUM, University of Bremen. The external standard errors for the oxygen and carbon isotope analyses are ±0.07‰ and ±0.05‰, respectively. Values are reported relative to the Vienna Pee Dee Belemnite (VPDB), calibrated by using the National Bureau of Standards (NBS) 18, 19 and 20. The oxygen isotope data were previously presented14,15,16, while the carbon isotope results are presented here for the first time (Supplementary Data 1).

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