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Radionuclide determinations in sediment core BOFS4C (PBISO)

Publication Date
DOI: 10.1594/pangaea.206162
  • Biogeochemical Ocean Flux Study
  • Bofs
  • Bofs11881#4
  • Bofs4C
  • Box Corer
  • D184
  • Density
  • Discovery (1962)
  • Jgofs
  • Joint Global Ocean Flux Study
  • Lead 210
  • Lead 210
  • Standard Deviation
  • Northeast Atlantic
  • Design


Radionuclide Determinations in Sediment Cores Introduction This document covers the data in files PBISO and UTHISO. The former contains lead isotope profiles obtained from multicore and box core samples. The latter contains uranium and thorium isotope data obtained from box core samples. The multicorer samples were analysed by a group at Edinburgh University. The box core samples were analysed by IOS Deacon Laboratory and the Scottish Universities Research and Reactor Centre. The data have been extensively used by Brand and Shimmield (1991), Thompson et al (1993a) and Thompson et al (1993b). Sample Acquisition The cores used for the radionuclide determinations were obtained with either a multicorer or box core. The multicorer used was a Duncan and Associates instrument which could take up to 12 5.5cm core tubes, 20cm apart, distributed over an area of 1 m2. The individual core tubes were based on the Craib Corer with tightly fitting caps at each end of the core tube which snapped into place as soon as the corer was lifted clear of the sediment. The cores obtained typically consisted of 10cm to 30cm of sediment overlain by 10cm to 20cm of bottom water. Multicorers are designed to obtain samples with the sediment-water interface undisturbed. The cores obtained for this study had clear overlying bottom water and many fine scale features such as worm tubes, settled planktonic faecal and degradation matter and brittle stars on the sediment surface showing that undisturbed cores had, in fact, been obtained. The cores were subsampled using a piston and screw jack mechanism fitted to the core barrel. In general, the top 1cm of the core was divided into 1mm sections, the next 1cm into 2mm sections, the next 8 cm into 5mm sections and the remainder into 1cm sections. Occasionally, alternative sampling schemes were used. The data include sufficient information to allow the precise sampling scheme for each core to be determined. The box cores were obtained using an IOS box corer (Peters et a

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