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

Wyatt, Neil J., Milne, Angela, Achterberg, Eric P. , Browning, Thomas J. , Bouman, Heather A., Woodward, E. Malcolm S. and Lohan, Maeve C. (2021) Seasonal cycling of zinc and cobalt in the south-eastern Atlantic along the GEOTRACES GA10 section. Open Access Biogeosciences (BG), 18 . pp. 4265-4280. DOI 10.5194/bg-18-4265-2021.

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Abstract

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.

Document Type: Article
Additional Information: Data availability. The trace metal and macronutrient data sets used for analyses in this study are available at https://www.bodc.ac.uk/geotraces/data/idp2017/ (GEOTRACES GA10) and phytoplankton data at https://www.bodc.ac.uk/.
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography > FB2-CH Water column biogeochemistry
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
NOC
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: Yes
Publisher: Copernicus Publications (EGU)
Related URLs:
Date Deposited: 16 Mar 2020 14:16
Last Modified: 07 Feb 2024 15:51
URI: https://oceanrep.geomar.de/id/eprint/49268

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