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dc.contributor.authorAshin, K.
dc.contributor.authorGirishkumar, M. S.
dc.contributor.authorSarma, V.V.S.S.,
dc.contributor.authorUdaya Bhaskar, T.V.S.
dc.date.accessioned2025-07-04
dc.date.accessioned2025-07-04T06:45:25Z
dc.date.available2025-06-03
dc.date.available2025-07-04T06:45:25Z
dc.date.issued2025
dc.identifier.citationDeep Sea Research Part II: Topical Studies in Oceanography, Vol. 222; 2025;article no:105499
dc.identifier.issn0967-0645
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0967064525000487
dc.identifier.urihttps://doi.org/10.1016/j.dsr2.2025.105499
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9482
dc.descriptionIF2023=3.0
dc.description.abstractThis study quantified the relative contributions of double diffusion and shear-driven mixing on the diapycnal oxygen flux in the oxycline region of the core of the Arabian Sea Oxygen Minimum Zone (OMZ), a critical oceanic region regulating the local ecosystem dynamics significantly. For that purpose, we used concurrent measurements of vertical profiles of dissolved oxygen and microstructure shear collected during the scientific cruise in May 2019. It was found that the presence of a moderately strong salt finger regime in the oxycline region enhanced the downward diapycnal oxygen flux (-7.0���0.5x10-2�?mol�m-2 s-1) by an order of magnitude higher in contrast to traditionally considered shear-driven turbulence alone (-6.4���0.7 x 10-3�?mol�m-2 s-1). This difference is solely attributable to the small magnitude of diapycnal diffusivity due to shear-driven turbulence (2.8���1.1 x 10-6�m2�s-1) compared to salt finger (10-5 to 10-4�m2�s-1). For the sake of comparison, the magnitude of lateral flux of oxygen due to horizontal circulation (3x10-4�?mol�m-2 s-1) and oxygen consumption rates due to biological processes estimated from observation (-3x10-3 to -40 x 10-3�?mol�m-2 s-1) were much smaller than salt finger induced downward diapycnal oxygen flux in the oxycline region. As a result, there was a net downward oxygen flux from the oxycline into the OMZ. These findings highlighted the need to incorporate double diffusion processes in biogeochemical models to improve the accuracy of vertical oxygen distribution simulations in the Arabian Sea OMZ.
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleDiapycnal oxygen flux in the oxycline region of the core of the Arabian Sea Oxygen Minimum Zone
dc.typeJournal Article
dc.affiliation.authorMinistry of Earth Sciences (MoES), Indian National Centre for Ocean Information Services (INCOIS), Telangana, India


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