dc.contributor.author | Sherin, C.K. | |
dc.contributor.author | Sarma, V.V.S.S. | |
dc.contributor.author | Rao, G.D. | |
dc.contributor.author | Viswanadham, R. | |
dc.contributor.author | Omand, M.M. | |
dc.contributor.author | Murty, V.S.N. | |
dc.date.accessioned | 2019/03/31 | |
dc.date.accessioned | 2019-04-30T12:44:24Z | |
dc.date.available | 2018/09/01 | |
dc.date.available | 2019-04-30T12:44:24Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Deep Sea Research Part I: Oceanographic Research Papers, vol.139; 2018; 43-54 | |
dc.identifier.issn | 0967-0637 | |
dc.identifier.uri | https://doi.org/10.1016/J.DSR.2018.06.002 | |
dc.identifier.uri | http://drs.nio.org/drs/handle/2264/8067 | |
dc.description.abstract | Variations 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.language | en | |
dc.publisher | Elsevier | |
dc.relation.isreferencedby | SCI | |
dc.title | New to total primary production ratio (f-ratio) in the Bay of Bengal using isotopic composition of suspended particulate organic carbon and nitrogen | |
dc.type | Journal Article | |
dc.affiliation.author | CSIR-National Institute of Oceanography, Visakhapatnam, Andhra Pradesh, India | |