Marine Isotope Stage 5e diatom assemblages in marine sediment core TPC290 (-55.55 degN, -45.02 degE, Cruise JR48) ...

• Main Authors: Chadwick, Matthew, Allen, Claire
• Format: Dataset
• Language: English
• Published: UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation 2021
• Subjects: "EARTH SCIENCE","BIOLOGICAL CLASSIFICATION","PROTISTS","DIATOMS"; Diatoms; Interglacial; Sediment core; Southern Ocean; Olympus
• Online Access: https://dx.doi.org/10.5285/d7c00bea-659a-426e-942f-821f6517c449; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01452

This dataset presents the relative diatom abundances of 55 species/groups from the 132-120 ka interval in marine sediment core TPC290 (-55.55 degN, -45.02 degE). This age interval corresponds to the peak of Marine Isotope Stage 5e (130- 116 ka). Microscope slides were prepared using a method adapted from Scherer (1994) and 300+ diatom valves were counted for each depth sample to produce the relative percentage abundance of each diatom species/group. This project was funded by the UK Natural Environment Research Council Grant NE/L002531/1 ... : Sediment core material was collected on Cruise JR48 (2000) of the RRS James Clark Ross (https://www.bodc.ac.uk/resources/inventories/cruise_inventory/reports/jr48.pdf). For the diatom assemblage data, microscope slides were produced using a method adapted from Scherer (1994). Samples of 7-20 mg were exposed to 10% Hydrochloric acid to remove any carbonate, 30% Hydrogen peroxide to break down organic material and a 4% Sodium Hexametaphosphate solution to promote disaggregation and placed in warm water bath for minimum 12 hours. The material was homogenised into a ~10cm water column and allowed to settle randomly onto coverslips over a minimum of 4 hours. The water was drained away and coverslips were mounted on microscope slides with Norland Optical Adhesive (NOA 61). Slides were investigated with a light microscope (Olympus BH-2 at x1000 magnification) and a minimum of 300 diatom valves were counted for each sample. Age Model Pugh et al. (2009) align core TPC290 to the EDC3 chronology by correlating the ...