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dc.contributor.authorNaqvi, S.W.A.
dc.contributor.authorJayakumar, D.A.
dc.contributor.authorNair, M.
dc.contributor.authorDileepKumar, M.
dc.contributor.authorGeorge, M.D.
dc.date.accessioned1994-12-23T10:06:28Z
dc.date.accessioned2017-09-30T01:55:44Z
dc.date.available1994-12-23T10:06:28Z
dc.date.available2017-09-30T01:55:44Z
dc.date.issued1994
dc.identifier.citationMarine Chemistry, vol.47(3-4); 1994; 269-278
dc.identifier.issn0304-4203
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7402
dc.description.abstractExtensive observations on nitrous oxide (N@d2@@O) in the atmosphere and waters of the western Bay of Bengal during March-April 1991 yield surface saturations and atmospheric fluxes ranging from 89.3 to 213.9% (mean 125.2%), and from 0.10 to 10.67 ~kmol (N@d2@@O)/m@u2@@/d (mean 0.65 ~kmol/m@u2@@'d), respectively. The overall N@d2@@O flux from the Bay of Bengal is estimated to be 0.027-0.077 Tg N/yr which is substantially lower than that computed for the Arabian Sea (0.19-0.28 Tg N/yr). Lower surface saturations and consequently smaller air-sea fluxes in the Bay of Bengal may result from strong stratification caused by the immense river runoff. The computed vertical exchange coefficient (0.16 cm@u2@@/s) at the top of the thermocline is about 1/3 of the corresponding value (0.55 cm@u2@@/s) in the Arabian Sea. The associated smaller nutrient fluxes to the euphotic zone may be significantly responsible for the lower productivity of the Bay of Bengal. As expected, marked accumulation of N@d2@@O occurs in subsurface layers of the Bay of Bengal with the total inventory of excess nitrous oxide (~nN@2@@O) estimated as ~5.4 Tg N. Since the Bay of Bengal is not an active water-column denitritification site, there appears to be no loss of N@d@@O through bacterial reduction. Vertical profiles of N@d2@@O are characterized by a pronounced maximum at ~ 200-300 m which intensifies northward. The N@d2@@O distribution seems to be influenced by the subsurface circulation. The relationship between ~nNd2@@O and the apparent oxygen utilization (AOU) is linear in three ranges: at AOU < 150 ~kM, from AOU ~- 150 ~kM to the N@d2@@O maximum (depth ~- 300 m), and at depths >~ 1000 m. Within the depth range ~ 300-1000 m, however, ~nN@d2@@O and AOU are not significantly correlated due to large changes in N@d2@@O concentrations associated with small varitions in the ambient oxygen levels
dc.languageen
dc.publisherElsevier
dc.relation.ispartofMar Chem
dc.relation.isreferencedbySCI
dc.subjectChemistry and Biogeochemistry
dc.subject.othernitrous oxide
dc.subject.othernutrients
dc.subject.othersaturation
dc.subject.otherthermocline
dc.subject.othereuphotic zone
dc.subject.othervertical profiles
dc.subject.otherISW, Bengal Bay
dc.titleNitrous oxide in the western Bay of Bengal
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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