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Determination of the carbon and nitrogen system at station CD46_0405G#5

Publication Date
DOI: 10.1594/pangaea.197225
  • 0405G#5
  • Biogeochemical Ocean Flux Study
  • Bofs
  • Bottle
  • Niskin
  • Carbon
  • Organic
  • Dissolved
  • Cd46
  • Cd46_0405G#5
  • Charles Darwin
  • High Temperature Catalytic Oxidation (Sugimura & Suzuki
  • 1988)
  • Jgofs
  • Joint Global Ocean Flux Study
  • Earth Science
  • Geography


Determinations of the Carbon and Nitrogen Systems Introduction This document describes the methodology used to obtain the parameters in file CN which includes a subset of the bottle data (discrete samples) assembled from the BOFS Atlantic cruises. A number of components of the carbon/carbonate system were determined from discrete bottle samples and these are described here. Components of the nitrogen cycle are similarly described. Each variable has been documented for sampling and analytical methodologies from information supplied by the analysts; operational information was also supplied by Research Vessel Services (RVS). Acquisition, Processing and Editing Water bottle samples were obtained either from the General Oceanics Rosette Multisampler (fitted with twelve 10-litre Go-Flo or Niskin water bottles), which was attached to a Neil Brown Mk 3B CTD, or from 7-litre Niskin water bottles, lowered from the electric hydrographic winch. In some cases (e.g. POC and PON), water samples were also obtained from the ship’s non-toxic pumped seawater supply. The source of the water for each measurement may be determined by looking up the bottle reference in the BOTTLE and EVENT index files. Individual datasets of water bottle data were largely worked up post-cruise by the responsible scientist and submitted to BODC for loading to the database. Datasets were uniquely identified and cross-referenced, using time and depth as the primary linking keys. Quality control was primarily the responsibility of the data originator. However, any errors detected by database users or BODC have been corrected. TCO2 by potentiometry The potentiometric method for determining TCO2 was only used on Discovery cruise 192 in conjunction with the standard coulometric method, as a means of validating the potentiometric technique for the determination of total alkalinity. Total alkalinity (TA) and total dissolved inorganic carbon (TCO2) were measured using a potentiometric titration method. The system includ

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