Articles | Volume 18, issue 5
Biogeosciences, 18, 1645–1671, 2021
https://doi.org/10.5194/bg-18-1645-2021
Biogeosciences, 18, 1645–1671, 2021
https://doi.org/10.5194/bg-18-1645-2021

Research article 09 Mar 2021

Research article | 09 Mar 2021

Radium-228-derived ocean mixing and trace element inputs in the South Atlantic

Yu-Te Hsieh et al.

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Cited articles

Achterberg, E. P., Steigenberger, S., Marsay, C. M., LeMoigne, F. A. C., Painter, S. C., Baker, A. R., Connelly, D. P., Moore, C. M., Tagliabue, A., and Tanhua, T.: Iron biogeochemistry in the high latitude North Atlantic Ocean, Sci. Rep., 8, 1283, https://doi.org/10.1038/s41598-018-19472-1, 2018. 
Achterberg, E. P., Steigenberger, S., Klar, J. K., Browning, T. J., Marsay, C. M., Painter, S. C., Vieira, L., Baker, A. R., Hamilton, D. S., Tanhua, T., and Moore, C. M.: Trace element biogeochemistry in the high latitude North Atlantic Ocean; seasonal variations and volcanic inputs, Global Biogeochem. Cy., e2020GB006674, https://doi.org/10.1029/2020GB006674, online first, 2020. 
Beal, L. M., De Ruijter, W. P. M., Biastoch, A., Zahn, R., and the SCOR/WCRP/IAPSO Working Group 136: On the role of the Agulhas system in ocean circulation and climate, Nature, 472, 429–436, https://doi.org/10.1038/nature09983, 2011. 
Bown, J., Boye, M., Baker, A., Duvieilbourg, E., Lacan, F., Le Moigne, F., Planchon, F., Speich, S., and Nelson, D. M.: The biogeochemical cycle of dissolved cobalt in the Atlantic and the Southern Ocean south off the coast of South Africa, Mar. Chem., 126, 193–206, https://doi.org/10.1016/j.marchem.2011.03.008, 2011. 
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Short summary
The South Atlantic near 40° S is one of the high-productivity and most dynamic nutrient regions in the oceans, but the sources and fluxes of trace elements (TEs) to this region remain unclear. This study investigates seawater Ra-228 and provides important constraints on ocean mixing and dissolved TE fluxes to this region. Vertical mixing is a more important source than aeolian or shelf inputs in this region, but particulate or winter deep-mixing inputs may be required to balance the TE budgets.
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