Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Keigwin, Lloyd D (1998): Stable isotope record of the Okhotsk Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.857992, Supplement to: Keigwin, LD (1998): Glacial-age hydrography of the far northwest Pacific Ocean. Paleoceanography, 13(4), 323-339, https://doi.org/10.1029/98PA00874

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
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. These results are consistent with a benthic front at ~2 km in the North Pacific (see Herguera et al., 1992), but they differ from interpretations based on trace metal data which indicate a source of nutrient-depleted deep water during glaciation. The isotopic data suggest that during glaciation there was a better ventilated watermass at intermediate depths in the far northwestern Pacific, it was relatively fresher than deep waters there, and deep waters were as nutrient-rich as today.
Coverage:
Median Latitude: 51.074109 * Median Longitude: 159.743814 * South-bound Latitude: 48.003200 * West-bound Longitude: 142.451000 * North-bound Latitude: 57.496200 * East-bound Longitude: 168.136660
Date/Time Start: 1975-09-05T00:00:00 * Date/Time End: 1993-09-13T06:32:00
Comment:
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.
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
11 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Keigwin, LD (1998): Stable oxygen isotope record of Neogloboquadrina pachyderma of sediment core 6-TOW-016GGC. https://doi.org/10.1594/PANGAEA.857977
  2. Keigwin, LD (1998): Stable oxygen isotope record of Neogloboquadrina pachyderma of sediment core B34-91. https://doi.org/10.1594/PANGAEA.857975
  3. Keigwin, LD (1998): Stable oxygen isotope record of Neogloboquadrina pachyderma of sediment core GGC-15-1. https://doi.org/10.1594/PANGAEA.857976
  4. Keigwin, LD (1998): (Table 1) Age determination of North Pacific Ocean sediment cores. https://doi.org/10.1594/PANGAEA.857985
  5. Keigwin, LD (1998): (Table 2) Hydrography of the Okhotsk Sea and Emperor Seamount Cruises. https://doi.org/10.1594/PANGAEA.857986
  6. Keigwin, LD (1998): (Table 3) Benthic foraminiferal stable isotopes in the Holocene Time Slice. https://doi.org/10.1594/PANGAEA.857989
  7. Keigwin, LD (1998): (Table 4) Benthic foraminiferal stable isotopes in the Last Glacial Maximum Time Slice. https://doi.org/10.1594/PANGAEA.857991
  8. Keigwin, LD (1998): Stable oxygen isotope record of Neogloboquadrina pachyderma of sediment core Vi-17GGC. https://doi.org/10.1594/PANGAEA.857979
  9. Keigwin, LD (1998): Stable oxygen isotope record of Neogloboquadrina pachyderma of sediment core Vi-26BC. https://doi.org/10.1594/PANGAEA.857980
  10. Keigwin, LD (1998): Stable isotope record of benthic foraminifera of sediment core Vi-37GC. https://doi.org/10.1594/PANGAEA.857984
  11. Keigwin, LD (1998): Stable oxygen isotope record of Neogloboquadrina pachyderma of sediment core Vi-37GC. https://doi.org/10.1594/PANGAEA.857981