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Radionuclides flux measured on samples from sediment trap DI181_11834#1

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.206561
Keywords
  • 11834#1
  • Biogeochemical Ocean Flux Study
  • Bofs
  • Calculated
  • D181
  • Date/Time End
  • Di181_11834#1
  • Discovery (1962)
  • Duration
  • Number Of Days
  • Jgofs
  • Joint Global Ocean Flux Study
  • Lead 210
  • Particulate Flux
  • Lead 210
  • Particulate Flux
  • Standard Deviation
  • Polonium 210
  • Particulate Flux
  • Polonium 210
  • Particulate Flux
  • Standard Deviation
  • Sample Code/Label
  • Thorium 230
  • Particulate Flux
  • Thorium 230
  • Particulate Flux
  • Standard Deviation
  • Thorium 232
  • Particulate Flux
  • Thorium 232
  • Particulate Flux
  • Standard Deviation
  • Trap
  • Sediment

Abstract

Moored Sediment Traps Introduction This document covers the moored sediment trap data in files STCNFX, STRDFX and STSPFX (fluxes) and STCN and STRD (composition analyses). The space and time co-ordinates of the samples collected may be determined from the index files STINDX and EVENT. Sample Acquisition Settling particles were collected using Parflux 7G-13 time-series sediment traps (Honjo and Doherty (1988)) moored at the sea bed. A typical mooring configuration is described by Newton (1990). These traps have a sampling aperture of 0.5m2 covered with a honeycomb baffle of 2.5cm diameter/6.25cm depth cells. Sample collection methods were consistent with JGOFS protocols (Knauer and Asper (1989)). Sampling cups were filled prior to deployment with deep seawater from the vicinity of the mooring site mixed with a buffered formalin-sodium chloride solution (analytical grade 40% formaldehyde solution with analytical grade NaCl, buffered by saturation with analytical grade sodium tetraborate and stripped of trace metals on a Chelex-100 NH3-form resin column (Bruland et al (1979)) to a final concentration of 5% w/v formalin (2% w/v formaldehyde) and 5ppt excess salinity. An aliquot of this solution was stored frozen for subsequent analysis. On trap recovery, 30ml of supernatant were immediately decanted from each sample and 1.0 ml buffered 40% formaldehyde (Chelex 100-stripped as above) added to give a formaldehyde concentration supplement of 0.15%. Samples were stored refrigerated in the dark until further manipulation on land. Decanted supernatants were stored frozen for subsequent analysis. Sample bottles and solutions contacted only plastic surfaces precleaned using 10% HCl and then soaked with high quality deionised water (MilliQ). Sample Pre-treatment Each sample was resuspended in its remaining supernatant and qualitatively described under x6 to x50 magnification. Swimmers were identified and removed during this descriptive step using plastic forceps according to the criteria of K

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