Nitrous oxide production in the tropical Atlantic Ocean

Oudot, Claude; Andrié, Chantal; Montel, Yves

doi:10.1016/0198-0149(90)90123-d

Cited by 73 publications

(43 citation statements)

References 52 publications

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“…We assume the AAIW transports N 2 O from the south to the cold-temperate North Atlantic. At depths shallower (Oudot et al, 2002) and a previous study in the Guinea Dome area (Oudot et al, 1990). Although the overall pattern is the same, we observed generally lower N 2 O concentrations than Oudot et al (2002).…”

Section: N 2 O In the Surface Layer Of The North Atlanticsupporting

confidence: 71%

Nitrous oxide in the North Atlantic Ocean

et al. 2006

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Section: N 2 O In the Surface Layer Of The North Atlanticsupporting

confidence: 71%

Nitrous oxide in the North Atlantic Ocean

et al. 2006

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“…This indicates that N 2 O was produced directly by phytoplankton through assimilatory nitrate reduction. Certain phytoplankton are known to be capable of N 2 O production (Weathers 1984), and Oudot et al (1990) observed a similar process occurring in the Atlantic Ocean off the coast of Africa. Nitrous oxide can also be produced by denitrifying bacteria attached to the outer surfaces of algae (Law et al 1993).…”

Section: Discussionmentioning

confidence: 77%

Potential role of copper availability in nitrous oxide accumulation in a temperate lake

Twining

Mylon

Benoit

2007

Limnology & Oceanography

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Denitrifying bacteria require copper for the synthesis of nitrous oxide reductase. In the absence of sufficient bioavailable Cu, nitrous oxide (N 2 O) may accumulate in natural waters during denitrification. Cultures of Paracoccus denitrificans and natural bacterial assemblages collected from a mesotrophic lake (Linsley Pond) were grown at varying Cu concentrations to determine the Cu speciation that results in elevated N 2 O accumulation. P. denitrificans experienced Cu limitation beginning at inorganic Cu concentrations of 0.6 fmol L 21 (2log of inorganic Cu, pCu9, 5 15.2). The natural community did not show an effect until pCu9 was reduced to 23.7 with 8-hydroxyquinoline, resulting in an approximate 10-fold increase in N 2 O concentrations during denitrification. Additions of ethylenediaminetetraacetic acid alone to natural communities did not affect N 2 O concentrations. Natural copper-binding ligands detected with competitive ligand exchange-cathodic stripping voltammetry occurred at concentrations of 6 to 25 nmol L 21 with conditional stability constants (K Cu 2z L ) between 10 14.4 and 10 15.1 . Although more than 99% of total Cu in Linsley Pond was bound to these ligands, inorganic Cu concentrations remained 10 orders of magnitude above those found to increase N 2 O accumulation during denitrification incubations. Measurements of nitrogen species, dissolved oxygen, and sulfide in the water column of Linsley Pond over the spring growing season revealed that N 2 O was produced by assimilatory nitrate reduction and nitrification in addition to denitrification, with nitrification generating most of the N 2 O found in the surface waters of the lake. The results suggest that inorganic Cu concentrations in Linsley Pond are sufficient to support denitrification. Moreover, some denitrifying bacteria may be able to access organically bound Cu, reducing the potential for this metal to affect N 2 O production in other aquatic environments.

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“…Several investigations have reported linear relationships between ΔN 2 O and AOU in various oceanic areas (Yoshinari, 1976;Elkins et al, 1978;Cohen and Gordon, 1979;Butler et al, 1989;Law and Owens, 1990;Oudot et al, 1990;Naqvi and Noronha, 1991;Naqvi et al, 1994;Nevison et al, 1995Nevison et al, , 2003. The AOU quantifies the amount of O 2 that is consumed by the remineralization of organic matter and nitrification in a water parcel since its last contact with the atmosphere.…”

Section: In Situ Biological Productionmentioning

confidence: 99%