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dc.contributor.authorMir, I.A.
dc.contributor.authorMascarenhas-Pereira, M.B.L.
dc.date.accessioned2023-04-12
dc.date.accessioned2023-07-17T15:32:54Z
dc.date.available2023-03-23
dc.date.available2023-07-17T15:32:54Z
dc.date.issued2023
dc.identifier.citationWater, vol.15(7); 2023; Article no: 1252
dc.identifier.issn2073-4441
dc.identifier.otherhttps://www.mdpi.com/2073-4441/15/7/1252
dc.identifier.urihttps://doi.org/10.3390/W15071252
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9058
dc.description3.530
dc.description.abstractThe temporal distribution of trace elements in a sediment core (SK117/GC-08) indicates minor changes in oxygenation during the last 100 kilo years in the bottom waters of the deeper eastern Arabian Sea. The high values of Mn, Co, Cu, Mn/Al, Co/Al, Cu/Al, V/Cr, and V/(V + Ni) in the sediments during interglacials and interstitials collectively indicate oxic conditions during warm periods. The high values of Cr, Ni, V, Mo, Cr/Al, Ni/Al, and Ni/Co in sediments during glacials and stadials collectively indicate dysoxic to suboxic conditions during the colder last glacial maximum and during the entire marine isotope stage two. The bottom waters have never experienced anoxic conditions. Multivariate statistics showed the attribution of the trace elements in two factors: cluster 1 (Co, Cu, Mn) was enriched during oxic conditions and cluster 2 (Cr, Mo, Ni, V) was enriched during dysoxic to suboxic conditions. Oxygenation conditions are mainly driven by variations in monsoon-controlled surface water productivity and changes in the flux of circumpolar deep water. The dysoxic to suboxic bottom water conditions developed at the core location during colder climates are very well synchronised with an increased organic matter flux. The main factor that controls the accumulation of the organic-rich sediments in the eastern Arabian Sea during a glacial is the increase in the supply of organic matter from increased primary productivity in the surface waters, controlled by winter monsoon winds, and localized convective mixing. During warmer interglacials and interstadials, the core location has remained well ventilated.
dc.languageen
dc.publisherMultidisciplinary Digital Publishing Institute (MDPI)
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.titleRedox Changes during the Past 100 ka in the Deeper Eastern Arabian Sea: A Study Based on Trace Elements and Multivariate Statistical Analysis
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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