Stable isotope record of the Okhotsk Sea ...
Stable isotope data on benthic foraminifera from more than 30 cores on the northern Emperor Seamounts and in the Okhotsk Sea are synthesized in paleohydrographic profiles spanning the depth range 1000-4000 m. Holocene (core-top) benthic foraminiferal d18O and d13C data are calibrated to modern hydro...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1998
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| Online Access: | https://dx.doi.org/10.1594/pangaea.857992 https://doi.pangaea.de/10.1594/PANGAEA.857992 |
| Summary: | Stable isotope data on benthic foraminifera from more than 30 cores on the northern Emperor Seamounts and in the Okhotsk Sea are synthesized in paleohydrographic profiles spanning the depth range 1000-4000 m. Holocene (core-top) benthic foraminiferal d18O and d13C data are calibrated to modern hydrographic properties through measurements of d13C of SumCO2 and d18O of seawater. Cibicidoides stable isotope ratios are close to the d13C and equilibrium d18O of seawater, whereas Uvigerina d18O and d13C are variably offset from Cibicidoides. Glacial maximum d13C of Cibicidoides displays a different vertical profile than that of the Holocene. When results are adjusted by +0.32 per mil to account for the secular change in d13C during the last glacial maximum, the data coincide with the modern seawater and foraminiferal curves deeper than ~2 km. However, at shallower depths d13C gradually increases by as much as 1 per mil above the modern value. Furthermore, above 2 km the benthic d18O decreases by ~0.5 per mil. ... : This directory contains foraminifer stable isotope data published in Keigwin (1998) Paleoceanography, plus additional files of d18-O (PDB) data from N. pachyderma (left) in the size fraction 150-250 µm not included in the paper. You are welcome to use the data from the other cores, with appropriate attribution. ... |
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