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- W2894092887 abstract "The elevated levels of primary productivity associated with eastern boundary currents are driven by nutrient- rich waters upwelled from depth, such that these regions are typically characterised by high rates of nitrate-fuelled phytoplankton growth. Production studies from the southern Benguela upwelling system (SBUS) tend to be biased towards the summer upwelling season, yet winter data are required to compute annual budgets and understand seasonal variability. Net primary production (NPP) and nitrate and ammonium uptake were measured concurrently at six stations in the SBUS in early winter. While euphotic zone NPP was highest at the stations nearest to the coast and declined with distance from the shore, a greater proportion was potentially exportable from open-ocean surface waters, as indicated by the higher specific nitrate uptake rates and f-ratios (ratio of nitrate uptake to total nitrogen consumption) at the stations located off the continental shelf. Near the coast, phytoplankton growth was predominantly supported by ammonium despite the high ambient nitrate concentrations. Along with ammonium concentrations as high as 3.6 µmol l–1, this strongly suggests that nitrate uptake in the inshore SBUS, and by extension carbon drawdown, is inhibited by ammonium, at least in winter, although this has also been hypothesised for the summer." @default.
- W2894092887 created "2018-10-05" @default.
- W2894092887 creator A5058997726 @default.
- W2894092887 creator A5065005215 @default.
- W2894092887 date "2018-07-03" @default.
- W2894092887 modified "2023-09-25" @default.
- W2894092887 title "Wintertime rates of net primary production and nitrate and ammonium uptake in the southern Benguela upwelling system" @default.
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- W2894092887 doi "https://doi.org/10.2989/1814232x.2018.1502095" @default.
- W2894092887 hasPublicationYear "2018" @default.
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