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. We report the distributions and stoichiometry of dissolved zinc (dZn) andcobalt (dCo) in sub-tropical and sub-Antarctic waters of the south-easternAtlantic Ocean during austral spring 2010 and summer 2011/2012. Insub-tropical surface waters, mixed-layer dZn and dCo concentrations duringearly spring were 1.60 ± 2.58 nM and 30 ± 11 pM, respectively,compared with summer values of 0.14 ± 0.08 nM and 24 ± 6 pM. Theelevated spring dZn concentrations resulted from an apparent offshoretransport of elevated dZn at depths between 20–55 m, derived fromthe Agulhas Bank. In contrast, open-ocean sub-Antarctic surface watersdisplayed largely consistent inter-seasonal mixed-layer dZn and dCoconcentrations of 0.10 ± 0.07 nM and 11 ± 5 pM, respectively.Trace metal stoichiometry, calculated from concentration inventories,suggests a greater overall removal for dZn relative to dCo in the upper watercolumn of the south-eastern Atlantic, with inter-seasonally decreasing dZn / dCoinventory ratios of 19–5 and 13–7 mol mol−1 forsub-tropical surface water and sub-Antarctic surface water, respectively. Inthis paper, we investigate how the seasonal influences of external input andphytoplankton succession may relate to the distribution of dZn and dCo andvariation in dZn / dCo stoichiometry across these two distinct ecologicalregimes in the south-eastern Atlantic.

Seasonal cycling of zinc and cobalt in the south-eastern Atlantic along the GEOTRACES GA10 section