Publication Date:
2023-06-27
Description:
The dataset consists of the total abundance of planktic foraminifera, the relative abundances of planktic foraminiferal species, and planktic and benthic oxygen and carbon stable isotope ratios of the uppermost 18.5 cm of gravity core OCE2017-GR02-GC. The core was retrieved from a plateau on the northeastern Greenland continental slope (77º05'11 N, 5º19'53 W, 1200 m water depth) during an expedition of R/V Oceania in August 2017. Here we present the record from the uppermost 18.5 cm of the total 135 cm of core length. The core was sampled at 0.5 cm intervals in the uppermost 10.5 cm and at 2 cm intervals in the remaining part. Samples were freeze-dried, weighed, wet-sieved through a 63 μm sieve, and subsequently split into size fractions using 100 and 500 μm sieves. Counts of planktic foraminiferal assemblages were conducted on representative splits (〉300 specimens) of the 100–500 μm size fraction. Individual species were identified and counted. The number of planktic foraminifera per 1 g dry sediment as well as the percentage of individual species was calculated. Stable oxygen and carbon isotope analyses were conducted on planktic species Neogloboquadrina pachyderma and benthic species Cassidulina neoteretis. Approximately 25 pristine specimens of planktics and 10 specimens of benthics were picked from the 100–500 μm size fraction. All stable isotope analyses were performed at the Light Stable Isotope Mass Spec Laboratory, Department of Geological Sciences, University of Florida, USA using a Kiel III carbonate preparation device coupled with a Finnigan-Mat 252 isotope ratio mass spectrometer. Each batch of samples was measured with 8 NBS-19 and 2 NBS-18 standards. Standard masses were 30-50 µg. Samples and standards were loaded in individual glass Kiel vials (round bottom with socket tops) and placed in a carousel which was inserted in the Kiel oven. Phosphoric acid with a specific gravity of 1.92 (at 25°C) was used. The reaction temperature was 70°C and the reaction time was 10 minutes. Results are expressed in the δ notation referring to the PDB standard and are given as δ18O and δ13C with an analytical accuracy of 0.04 and 0.02 ‰, respectively. The stable isotope data were not corrected for vital effect nor global ice volume. The data were acquired in 2020.
Keywords:
abundance data; Cassidulina neoteretis, δ13C; Cassidulina neoteretis, δ18O; Counting 100-500 µm fraction; DEPTH, sediment/rock; Foraminifera, planktic; GC; Globigerina bulloides; Gravity corer; Greenland Sea; Mass spectrometer Finnigan MAT 252; Neogloboquadrina incompta; Neogloboquadrina pachyderma; Neogloboquadrina pachyderma, δ13C; Neogloboquadrina pachyderma, δ18O; Nordic Seas; OC17/08; OCE2017-GR02-GC; Oceania; planktic foraminifera; stabe isotopes; Turborotalita quinqueloba
Type:
Dataset
Format:
text/tab-separated-values, 225 data points
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