Articles | Volume 18, issue 19
https://doi.org/10.5194/bg-18-5447-2021
https://doi.org/10.5194/bg-18-5447-2021
Research article
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07 Oct 2021
Research article | Highlight paper |  | 07 Oct 2021

Modeling the marine chromium cycle: new constraints on global-scale processes

Frerk Pöppelmeier, David J. Janssen, Samuel L. Jaccard, and Thomas F. Stocker

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Cited articles

Barbeau, K., Rue, E. L., Bruland, K. W., and Butler, A.: Photochemical cycling of iron in the surface ocean mediated by microbial iron(III)-binding ligands, Nature, 413, 409–413, https://doi.org/10.1038/35096545, 2001. 
Battaglia, G. and Joos, F.: Marine N2O Emissions From Nitrification and Denitrification Constrained by Modern Observations and Projected in Multimillennial Global Warming Simulations, Global Biogeochem. Cy., 32, 92–121, https://doi.org/10.1002/2017GB005671, 2018. 
Bianchi, D., Dunne, J. P., Sarmiento, J. L., and Galbraith, E. D.: Data-based estimates of suboxia, denitrification, and N2O production in the ocean and their sensitivities to dissolved O2, Global Biogeochem. Cy., 26, 1–13, https://doi.org/10.1029/2011GB004209, 2012. 
Bonnand, P., James, R. H., Parkinson, I. J., Connelly, D. P., and Fairchild, I. J.: The chromium isotopic composition of seawater and marine carbonates, Earth Planet. Sci. Lett., 382, 10–20, https://doi.org/10.1016/j.epsl.2013.09.001, 2013. 
Brumsack, H. J. and Gieskes, J. M.: Interstital water trace-metal chemistry of laminated sediments from the Gulf of California, Mexico, Mar. Chem., 14, 89–106, 1983. 
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Chromium (Cr) is a redox-sensitive element that holds promise as a tracer of ocean oxygenation and biological activity. We here implemented the oxidation states Cr(III) and Cr(VI) in the Bern3D model to investigate the processes that shape the global Cr distribution. We find a Cr ocean residence time of 5–8 kyr and that the benthic source dominates the tracer budget. Further, regional model–data mismatches suggest strong Cr removal in oxygen minimum zones and a spatially variable benthic source.
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