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dc.contributor.authorMoffetta, J.W.
dc.contributor.authorGoepferta, T.J.
dc.contributor.authorNaqvi, S.W.A.
dc.date.accessioned2008-01-30T12:41:28Z
dc.date.available2008-01-30T12:41:28Z
dc.date.issued2007
dc.identifier.citationDeep-Sea Research I, Vol.54; 1341-1349p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/669
dc.description.abstractDissolved iron and Fe(II) were measured in the oxygen minimum zone (OMZ) of the Arabian Sea in September 2004. The OMZ is a well-demarcated feature characterized by high rates of denitrification, and a deep nitrite maximum coinciding with oxygen levels below 1 mu mol L sup(-1). This zone is significantly enriched in dissolved Fe relative to overlying and underlying waters and up to 50% of the dissolved Fe is present as Fe(II). The maxima in Fe(II) are at the same depth as the deep nitrite maxima, centered around 200-250 m. They coincide with a local maximum in total dissolved Fe, suggesting that Fe accumulates at this depth because of the greater solubility of Fe(II) over Fe(III). Fe(II) is thermodynamically unstable even at submicromolar oxygen levels, so active biological reduction is the most plausible source. To our knowledge, this is the first report of a potential link between Fe reduction, elevated dissolved Fe concentrations, and nitrite accumulation within an OMZ. Denitrification has a high Fe requirement associated with the metalloenzymes for nitrate and nitrite reduction, so in situ redox cycling of Fe has important implications for the nitrogen cycle.
dc.language.isoen
dc.publisherElsevier
dc.subjectdissolved organic matter
dc.subjectoxygen minimum layer
dc.subjectiron
dc.subjectnitrites
dc.subjectredox reactions
dc.titleReduced iron associated with secondary nitrite maxima in the Arabian Sea
dc.typeJournal Article


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