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dc.contributor.authorSherin, C.K.
dc.contributor.authorSarma, V.V.S.S.
dc.contributor.authorRao, G.D.
dc.contributor.authorViswanadham, R.
dc.contributor.authorOmand, M.M.
dc.contributor.authorMurty, V.S.N.
dc.date.accessioned2019/03/31
dc.date.accessioned2019-04-30T12:44:24Z
dc.date.available2018/09/01
dc.date.available2019-04-30T12:44:24Z
dc.date.issued2018
dc.identifier.citationDeep Sea Research Part I: Oceanographic Research Papers, vol.139; 2018; 43-54
dc.identifier.issn0967-0637
dc.identifier.urihttps://doi.org/10.1016/J.DSR.2018.06.002
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8067
dc.description.abstractVariations in the content and isotopic compositions of carbon and nitrogen in the suspended particulate matter were analysed to identify sources of nutrients and compute f-ratios (ratio of new production to primary production) in the Bay of Bengal (BoB) during the post-monsoon period (November-December 2013). Remote sensing data during our observation period indicated that the study region encompassed meso-scale cyclonic (CE) and anticyclonic eddies (ACE) and was influenced by tropical cyclone Madi between 6 and 12 December 2013. Relatively higher concentrations of nitrate were observed in the CE and in the cyclone-influenced region compared to that in the ACE. Variable concentrations of nutrients controlled the size distributions of phytoplankton. Overall, the picoplankton population dominated, but the contributions of micro- and nano-plankton populations were significantly higher in the CE region because of higher concentration of nutrients. The -13Csus, C:N molar ratios and C: Chl-a ratios suggested that suspended matter is mainly contributed by in situ processes during the study period. The -15Nsus of suspended matter suggested that vertical supply of nutrients brought from subsurface water supported new production in the CE and cyclone-influenced regions, whereas regenerated nutrients supported phytoplankton production in the ACE. The f-ratios computed using -15Nsus and depth of nitracline were high in the CE (0.41±0.14) and cyclone-influenced region (0.54±0.12) and lower in the ACE (0.27±0.06). This study revealed that the meso-scale CEs are more important in enhancing exportable production in the BoB. As more than 30 CEs form annually in the BoB, their impact on basin-wide new production and export flux to the deeper ocean must be evaluated using both observations and high-resolution models.
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.titleNew to total primary production ratio (f-ratio) in the Bay of Bengal using isotopic composition of suspended particulate organic carbon and nitrogen
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Visakhapatnam, Andhra Pradesh, India


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