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dc.contributor.authorBristow, L.A.
dc.contributor.authorCallbeck, C.M.
dc.contributor.authorLarsen, M.
dc.contributor.authorAltabet, M.A.
dc.contributor.authorDekaezemacker, J.
dc.contributor.authorForth, M.
dc.contributor.authorGauns, M.
dc.contributor.authorGlud, R.N.
dc.contributor.authorKuypers, M.M.M.
dc.contributor.authorLavik, G.
dc.contributor.authorMilucka, J.
dc.contributor.authorNaqvi, S.W.A.
dc.contributor.authorPratihary, A.K.
dc.contributor.authorRevsbech, N.P.
dc.contributor.authorThamdrup, B.
dc.contributor.authorTreusch, A.H.
dc.contributor.authorCanfield, D.E.
dc.date.accessioned2017-03-01T09:07:11Z
dc.date.available2017-03-01T09:07:11Z
dc.date.issued2017
dc.identifier.citationNature Geoscience, vol.10; 2017; 24-29
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/5082
dc.description.abstractA third or more of the fixed nitrogen lost from the oceans as N<sub>2</sub> is removed by anaerobic microbial processes in open ocean oxygen minimum zones. These zones have expanded over the past decades, and further anthropogenically induced expansion could accelerate nitrogen loss. However, in the Bay of Bengal there has been no indication of nitrogen loss, although oxygen levels are below the detection level of conventional methods (1 to 2 ìM). Here we quantify the abundance of microbial genes associated with N2 production, measure nitrogen transformations in incubations of sampled seawater with isotopically labelled nitrogen compounds and analyse geochemical signatures of these processes in the water column. We find that the Bay of Bengal supports denitrifier and anammox microbial populations, mediating low, but significant N loss. Yet, unlike other oxygen minimum zones, our measurements using a highly sensitive oxygen sensor demonstrate that the Bay of Bengal has persistent concentrations of oxygen in the 10 to 200 nM range. We propose that this oxygen supports nitrite oxidation, thereby restricting the nitrite available for anammox or denitrification. If these traces of oxygen were removed, nitrogen loss in the Bay of Bengal oxygen minimum zone waters could accelerate to global significance
dc.language.isoen
dc.publisherMacmillan Publishers Limited
dc.rightsCopyright [2017]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.subjectChemistry and biogeochemistry
dc.subjectChemistry and biogeochemistry
dc.subjectMicrobiology
dc.titleN2 production rates limited by nitrite availability in the Bay of Bengal oxygen minimum zone
dc.typeJournal Article


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