Measurements of net and gross O2 production, dark O2 respiration, and 14C assimilation at the Marine Light-Mixed Layers site (59°N, 21°W) in the northeast Atlantic Ocean

C. Langdon, J. Marra, C. Knudson

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23 Scopus citations


Results indicate that gross O2 production and 14C uptake were tightly coupled; the ratio of gross O2 production to dawn-to-dusk 14C uptake averaged 1.4 ± 0.1 (SE). Net autotrophic O2 production, estimated as gross O2 production minus a floristically determined chlorophyll a specific respiration rate times the chlorophyll a concentration, was compared for the first time with 14C uptake. These two processes were not tightly coupled; the ratio of net autotrophic O2 production to 14C uptake varied from 1.0 at 2 m to 0.2 at 15 m. The 24-hour 14C-based turnover rates (k14C) for the mixed layer exhibited little relationship to in situ POC turnover rates. Turnover rate based on 24-hour net community O2 production (kO2) converted to carbon using a molar ratio of O2 produced to CO2 assimilated (PQ) of 1.4 was a more useful indicator of kPOC. -from Authors

Original languageEnglish (US)
Pages (from-to)6645-6653
Number of pages9
JournalJournal of Geophysical Research
Issue numberC4
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology


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