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

Chris Langdon, J. Marra, C. Knudson

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23 Citations (Scopus)

Abstract

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
Pages (from-to)6645-6653
Number of pages9
JournalJournal of Geophysical Research
Volume100
Issue numberC4
StatePublished - Jan 1 1995
Externally publishedYes

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Atlantic Ocean
respiration
assimilation
mixed layer
turnover
ocean
chlorophyll a
chlorophylls
rate
carbon
Carbon

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

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title = "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",
abstract = "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",
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TY - JOUR

T1 - 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

AU - Langdon, Chris

AU - Marra, J.

AU - Knudson, C.

PY - 1995/1/1

Y1 - 1995/1/1

N2 - 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

AB - 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

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JO - Journal of Geophysical Research: Oceans

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