Nitrous oxide in the western Bay of Bengal

Naqvi, S.W.A.; Jayakumar, D. A.; Nair, M.; Kumar, M. Dileep; George, Matthieu

doi:10.1016/0304-4203(94)90025-6

Cited by 59 publications

(41 citation statements)

References 21 publications

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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%

Distributions and sea-to-air fluxes of nitrous oxide in the South China Sea and the West Philippines Sea

Tseng

Chen

Borges

et al. 2016

Deep Sea Research Part I: Oceanographic Research Papers

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Section: In Situ Biological Productionmentioning

confidence: 99%

Distributions and sea-to-air fluxes of nitrous oxide in the South China Sea and the West Philippines Sea

Tseng

Chen

Borges

et al. 2016

Deep Sea Research Part I: Oceanographic Research Papers

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“…However, denitrification and/or anammox are confined to the former two basins (e.g., Gonzalez et al, ; Kalvelage et al, ; Naqvi et al, ; Pitcher et al, ; Ruch et al, ; Ward et al, ). Although the conditions appear to be conducive for denitrification/anammox to occur in the BoB, its absence is attributed to incomplete oxidation of organic matter due to mineral ballast leading to relatively higher oxygen in the OMZ of the BoB than in the AS and ETP (Ittekkot et al, ; Naqvi et al, ; Rao et al, ; Sarma et al, ). Advection of organic detritus from the upwelling region to the OMZ is suggested to be one of the important factors to intensify OMZ in the ETP and AS; however, such sources are weak in the BoB due to strong stratification (McCreary et al, ).…”

Section: Introductionmentioning

confidence: 99%

Ventilation of Oxygen to Oxygen Minimum Zone Due to Anticyclonic Eddies in the Bay of Bengal

Sridevi

Bhaskar²

2018

JGR Biogeosciences

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Intense oxygen minimum zone (OMZ) occurs in the middepth of the Eastern Tropical Pacific (ETP), Arabian Sea (AS), and Bay of Bengal (BoB). However, the occurrence of anammox/denitrification was reported only in the ETP and AS and its absence in the BoB is attributed to presence of traces of dissolved oxygen (DO). Anticyclonic eddies (ACEs) supply high-nutrient, organic-rich, and oxygen-poor waters from the coastal upwelling regions leading to strengthening of OMZ in the offshore of AS and ETP. In the absence of western boundary upwelling, we hypothesize that the ACEs supply DO-rich water leading to weakening of OMZ in the BoB. Six ACEs were sampled by bio-argo floats and measured in situ hydrography and DO. All sampled eddies were formed in the eastern BoB, close to Andaman Sea, and moved toward west. Warm and DO-rich waters were observed in the core of OMZ (150-300 m), influenced by ACEs, by 0.5-1.46°C and 3.2-6.5 μM, respectively, than no eddy region in the BoB. Based on the mean lifetime of ACE, the rate of ventilation in the 100-300 m was estimated to be 0.07 ± 0.02 μmol/L/day, which is 3 to 4 times higher than bacterial respiration rates (0.02 μmol/L/day). Concerns of OMZ intensification leading to denitrification/anammox conditions in the BoB have been expressed, but with several ACEs forming in time and space in the BoB the denitrification occurrence is unlikely.SARMA AND UDAYA BHASKAR 2145

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“…Paper number 95GB03834. 0886-6236/96/95GB-03834510.00 example, the Arabian Sea [Law and Owens, 1990b;Naqvi and Noronha, 1991 ], the westem Bay of Bengal [Naqvi et al, 1994], the Peruvian upwelling [Codispoti et al, 1992], and the tropical equatorial upwelling regions of the Pacific Ocean Butler et al, 1989;Weiss et al, 1992].…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide in coastal waters

Bange¹,

Rapsomanikis²,

Andreae³

1996

Global Biogeochemical Cycles

236

126

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We determined atmospheric and dissolved nitrous oxide (N2O) in the surface waters of the central North Sea, the German Bight, and the Gironde estuary. The mean saturations were 104 ± 1% (central North Sea, September 1991), 101 ± 2% (German Bight, September 1991), 99 ± 1% (German Bight September 1992), and 132% (Gironde estuary, November 1991). To evaluate the contribution of coastal areas and estuaries to the oceanic emissions we assembled a compilation of literature data. We conclude that the mean saturations in coastal regions (with the exception of estuaries and regions with upwelling phenomena) are only slightly higher than in the open ocean. However, when estuarine and coastal upwelling regions are included, a computation of the global oceanic N2O flux indicates that a considerable portion (approximately 60%) of this flux is from coastal regions, mainly due to high emissions from estuaries. We estimate, using two different parameterizations of the air‐sea exchange process, an annual global sea‐to‐air flux of 11–17 Tg N2O. Our results suggest a serious underestimation of the flux from coastal regions in widely used previous estimates.

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Nitrous oxide in the western Bay of Bengal

Cited by 59 publications

References 21 publications

Distributions and sea-to-air fluxes of nitrous oxide in the South China Sea and the West Philippines Sea

Distributions and sea-to-air fluxes of nitrous oxide in the South China Sea and the West Philippines Sea

Ventilation of Oxygen to Oxygen Minimum Zone Due to Anticyclonic Eddies in the Bay of Bengal

Nitrous oxide in coastal waters

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