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dc.contributor.authorSarma, V.V.S.S.
dc.contributor.authorDalabehera, H.B.
dc.date.accessioned2019-12-31
dc.date.accessioned2020-02-04T09:38:19Z
dc.date.available2019-09-20
dc.date.available2020-02-04T09:38:19Z
dc.date.issued2019
dc.identifier.citationMarine Chemistry, vol.215; 2019; Article no: 103687
dc.identifier.urihttps://doi.org/10.1016/j.marchem.2019.103687
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/8194
dc.description.abstractTo examine the spatial variability and controlling factors of new, regenerated and primary productions, 21 stations were studied during fall monsoon period in the western Indian Ocean under Indian-GEOTRACES program. The primary, new and regenerated productions were estimated based on the incubation of enriched 13CHCO3 and 15NNO3, 15NNH4 tracers respectively. High nitrate and phosphate concentrations were observed in the upper 30 m of water column in the Arabian Sea (AS) due to advection of upwelled waters from Oman and Somalia coasts. Chl-a in the upper 25 m of water column was low with prominent subsurface Chl-a maximum (0.5-1.3 mg m?3) between 25 and 50 m. The mean new production was almost similar in the AS and the South Indian Ocean (SIO; north of 30?�S) with higher regenerated production in the SIO than AS. The photic zone integrated nitrate, and phosphate showed positive relation with primary production and negative relation with new and regenerated production. The photic zone integrated primary production was more than double in the AS (1238 ?� 626 mg C m?2 d?1) compared to the SIO (675?� 431 mg C m?2 d?1) with significant positive relation with photic zone integrated Chl-a. The range of primary production observed in the Indian Ocean (236-1899 mgC m?2 d?1) is within the range observed in the tropical Pacific and Atlantic Oceans (210-1887 mgC m?2 d?1). The contribution of primary production in the upper 25 m to photic zone integrated production was higher in the AS than the SIO due to low nutrients in the upper water column in the latter basin. Depth of nitracline showed inverse relation with primary production and f-ratios (ratio of new to primary production) in the study region. Insignificant differences in mean primary production and f-ratios were observed in the AS during 2015 (present study) as compared to a 1995 study, contradicting the belief that rapid warming may modify primary production.
dc.languageen
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.titleNew and primary production in the western Indian Ocean during fall monsoon
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Visakhapatnam, Andhra Pradesh, India


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