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BG | Articles | Volume 17, issue 13
Biogeosciences, 17, 3685–3704, 2020
https://doi.org/10.5194/bg-17-3685-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Ocean deoxygenation: drivers and consequences – past, present...

Biogeosciences, 17, 3685–3704, 2020
https://doi.org/10.5194/bg-17-3685-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Jul 2020

Research article | 15 Jul 2020

The control of hydrogen sulfide on benthic iron and cadmium fluxes in the oxygen minimum zone off Peru

Anna Plass et al.

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Audry, S., Blanc, G., Schäfer, J., Chaillou, G. and Robert, S.: Early diagenesis of trace metals (Cd, Cu, Co, Ni, U, Mo, and V) in the freshwater reaches of a macrotidal estuary, Geochim. Cosmochim. Ac., 70, 2264–2282, https://doi.org/10.1016/j.gca.2006.02.001, 2006. 
Ball, J. W. and Nordstrom, D. K.: WATEQ4F – User's manual with revised thermodynamic data base and test cases for calculating speciation of major, trace and redox elements in natural waters, US Geol. Surv., (Open-File Rep.) 91–183, https://doi.org/10.3133/ofr90129, 1991. 
Bianchi, D., Weber, T. S., Kiko, R., and Deutsch, C.: Global niche of marine anaerobic metabolisms expanded by particle microenvironments, Nat. Geosci., 11, 1–6, https://doi.org/10.1038/s41561-018-0081-0, 2018. 
Biller, D. V. and Bruland, K. W.: Sources and distributions of Mn, Fe, Co, Ni, Cu, Zn, and Cd relative to macronutrients along the central California coast during the spring and summer upwelling season, Mar. Chem., 155, 50–70, https://doi.org/10.1016/j.marchem.2013.06.003, 2013. 
Böning, P., Brumsack, H. J., Böttcher, M. E., Schnetger, B., Kriete, C., Kallmeyer, J., and Borchers, S. L.: Geochemistry of Peruvian near-surface sediments, Geochim. Cosmochim. Ac., 68, 4429–4451, https://doi.org/10.1016/j.gca.2004.04.027, 2004. 
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We compare the cycling of Fe and Cd in sulfidic sediments of the Peruvian oxygen minimum zone. Due to the contrasting solubility of their sulfide minerals, the sedimentary Fe release and Cd burial fluxes covary with spatial and temporal distributions of H2S. Depending on the solubility of their sulfide minerals, sedimentary trace metal fluxes will respond differently to ocean deoxygenation/expansion of H2S concentrations, which may change trace metal stoichiometry of upwelling water masses.
We compare the cycling of Fe and Cd in sulfidic sediments of the Peruvian oxygen minimum zone....
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