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Oxygen saturation of sediment core BOFS23/2M-3

Publication Date
DOI: 10.1594/pangaea.199522
  • Biogeochemical Ocean Flux Study
  • Bofs
  • Bofs23/2M
  • Bofs23#2
  • Cd53
  • Charles Darwin
  • Jgofs
  • Joint Global Ocean Flux Study
  • Multicorer
  • Northeast Atlantic
  • Oxygen
  • Microelectrode
  • Oxygen
  • Saturation


Oxygen Microelectrode Profiles Introduction This document covers the data held in file COXPROF which comprise oxygen saturation profiles in samples collected using the Multicorer from the overlying water through the sediment-water interface into the sediment. Replicate profiles and profiles from more than one core tube are frequently included. The cores were collected on two BOFS cruises, Discovery 184 and Charles Darwin 53. Sampling The cores were taken using an SMBA Multicorer (Barnett et al (1984)) manufactured by Duncan and Associates. Essentially, this consists of up to twelve Craib corers (5.5cm diameter 20cm apart) mounted on a central block (1 m2 area) connected to a large frame, manufactured from heavy steel tube, through hydraulic dampers. When deployed, the frame settles on the sea bed and the core tubes are gently pressed into the sediment under pressure from a lead weight. On lifting, the core tubes are sealed at each end by spring-loaded plugs. The primary feature of this device is that the sediment-water interface within the core tubes is virtually undisturbed. The cores produced are short, generally less than 20cm and are retrieved with 10-20cm of overlying bottom water. Profile Measurement The profiles were measured using a Micro-Sense (Clark type) combined oxygen micro-electrode mounted on a micromanipulator, capable of increments as small as 5 microns. The probe had a tip diameter of 100-200 microns and gave rise to an oxygen consumption of less than 500 pA. This consumption was adequately compensated by diffusion and hence the profile was unaffected by the measurement process. The output signal was amplified by a Micro-Sense Supplier Converter which also supplied the voltage required for polarisation of the electrode. The amplified signal was measured using a conventional millivolt meter. Once on board, the cores were incubated at 3°C for 2-6 hours prior to measurement to allow them to attain thermal equilibrium. This prevented problems due to electrode sens

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