Browsing by Subject "Southern Ocean nitrogn uptake"

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    Nitrogen uptake by phytoplankton in the Atlantic sector of the Southern Ocean during late austral summer
    (2011) Joubert, W R; Thomalla, S J; Waldron, H N; Lucas, M I; Boye, M; Le Moigne, F A C; Planchon, F; Speich, S
    As part of the Bonus-Good Hope (BGH) campaign, 15N-labelled nitrate, ammonium and urea uptake measurements were made along the BGH transect from Cape Town to ~ 60° S in late austral summer, 2008. Our results are categorised according to distinct hydrographic regions defined by oceanic fronts and open ocean zones. Nitrogen uptake (ρN) in the oligotrophic Subtropical Zone (STZ) was dominated by ρ urea, which contributed up to 70 % of ρN. High regenerated ρN in the STZ resulted in low f-ratios (f = 0.2). Size fractionated chlorophyll data showed that the greatest contribution (>50 %) of picophytoplankton (