Wyatt, Neil J.
[Verfasser:in];
Milne, Angela
[Verfasser:in];
Achterberg, Eric P.
[Verfasser:in];
Browning, Thomas J.
[Verfasser:in];
Bouman, Heather A.
[Verfasser:in];
Woodward, E. Malcolm S.
[Verfasser:in];
Lohan, Maeve C.
[Verfasser:in]
Seasonal cycling of zinc and cobalt in the south-eastern Atlantic along the GEOTRACES GA10 section
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Medientyp:
E-Artikel
Titel:
Seasonal cycling of zinc and cobalt in the south-eastern Atlantic along the GEOTRACES GA10 section
Beteiligte:
Wyatt, Neil J.
[Verfasser:in];
Milne, Angela
[Verfasser:in];
Achterberg, Eric P.
[Verfasser:in];
Browning, Thomas J.
[Verfasser:in];
Bouman, Heather A.
[Verfasser:in];
Woodward, E. Malcolm S.
[Verfasser:in];
Lohan, Maeve C.
[Verfasser:in]
Anmerkungen:
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Beschreibung:
We report the distributions and stoichiometry ofdissolved zinc (dZn) and cobalt (dCo) in sub-tropical andsub-Antarctic waters of the south-eastern Atlantic Oceanduring austral spring 2010 and summer 2011/2012. In sub-tropical surface waters, mixed-layer dZn and dCo con-centrations during early spring were 1.60±2.58 nM and30±11 pM, respectively, compared with summer values of0.14±0.08 nM and 24±6 pM. The elevated spring dZn con-centrations resulted from an apparent offshore transport ofelevated dZn at depths between 20–55 m, derived from theAgulhas Bank. In contrast, open-ocean sub-Antarctic surfacewaters displayed largely consistent inter-seasonal mixed-layer dZn and dCo concentrations of 0.10±0.07 nM and11±5 pM, respectively. Trace metal stoichiometry, calcu-lated from concentration inventories, suggests a greater over-all removal for dZn relative to dCo in the upper water columnof the south-eastern Atlantic, with inter-seasonally decreas-ing dZn/dCo inventory ratios of 19–5 and 13–7 mol mol−1for sub-tropical surface water and sub-Antarctic surface wa-ter, respectively. In this paper, we investigate how the sea-sonal influences of external input and phytoplankton succes-sion may relate to the distribution of dZn and dCo and varia-tion in dZn/dCo stoichiometry across these two distinct eco-logical regimes in the south-eastern Atlantic.